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<!DOCTYPE html> <html class='v2 list-page' dir='ltr' itemscope='' itemtype='http://schema.org/Blog' lang='en' xmlns='http://www.w3.org/1999/xhtml' xmlns:b='http://www.google.com/2005/gml/b' xmlns:data='http://www.google.com/2005/gml/data' xmlns:expr='http://www.google.com/2005/gml/expr'> <head> <link href='https://www.blogger.com/static/v1/widgets/3566091532-css_bundle_v2.css' rel='stylesheet' type='text/css'/> <title> Chromium Blog: v8 </title> <meta content='width=device-width, height=device-height, initial-scale=1.0' name='viewport'/> <meta content='IE=Edge' http-equiv='X-UA-Compatible'/> <meta content='Chromium Blog' property='og:title'/> <meta content='en_US' property='og:locale'/> <meta content='https://blog.chromium.org/search/label/v8' property='og:url'/> <meta content='Chromium Blog' property='og:site_name'/>  <meta content='Chromium Blog' property='og:title'/> <meta content='summary' name='twitter:card'/> <meta content='@ChromiumDev' name='twitter:creator'/> <link href='https://fonts.googleapis.com/css?family=Roboto:400italic,400,500,500italic,700,700italic' rel='stylesheet' type='text/css'/> <link href='https://fonts.googleapis.com/icon?family=Material+Icons' rel='stylesheet'/> <script src='https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js' type='text/javascript'></script>  <style id='page-skin-1' type='text/css'></style> <style id='template-skin-1' type='text/css'></style>  <meta content='text/html; 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} #sidebar-bottom { background: #f5f5f5; border-top:1px solid #eee; } #sidebar-bottom .widget { border-bottom: 1px solid #e0e0e0; padding: 15px 0; text-align: center; } #sidebar-bottom > div:last-child { border-bottom: 0; } #sidebar-bottom .text { line-height: 20px; } /* Home, forward, and backward pagination. */ .blog-pager { border-top : 1px #e0e0e0 solid; padding-top: 10px; margin-top: 15px; text-align: right !important; } #blog-pager { margin-botom: 0; margin-top: -14px; padding: 16px 0 0 0; } #blog-pager a { display: inline-block; } .blog-pager i.disabled { opacity: 0.2 !important; } .blog-pager i { color: black; margin-left: 16px; opacity: 0.54; } .blog-pager i:hover, .blog-pager i:active { opacity: 0.87; } #blog-pager-older-link, #blog-pager-newer-link { float: none; } .gplus-profile { background-color: #fafafa; border: 1px solid #eee; overflow: hidden; width: 212px; } .gplus-profile-inner { margin-left: -1px; margin-top: -1px; } /* Sidebar follow buttons. */ .followgooglewrapper { padding: 12px 0 0 0; } .loading { visibility: hidden; } .detail-page .post-footer .cmt_iframe_holder { padding-top: 40px !important; } /** Desktop **/ @media (max-width: 900px) { .col-right { display: none; } .col-main { margin-right: 0; min-width: initial; } .footer-outer { display: none; } .cols-wrapper { min-width: initial; } .google-footer-outer { background-color: #f5f5f5; } } /** Tablet **/ @media (max-width: 712px) { .header-outer, .cols-wrapper, .footer-outer, .google-footer-outer { padding: 0 40px; } } /* An extra breakpoint accommodating for long blog titles. */ @media (max-width: 600px) { .header-left { height: 100%; position: initial; top: inherit; margin-top: 0; -webkit-transform: initial; transform: initial; } .header-title { margin-top: 18px; } .header-inner { height: auto; margin-bottom: 32px; margin-top: 32px; } .header-desc { margin-top: 12px; } .header-inner .google-logo { height: 70px; margin-top: 3px; } .header-inner .google-logo img { height: 70px; } .header-title h2 { font-size: 32px; line-height: 76px; } } /** Mobile/small desktop window; also landscape. **/ @media (max-width: 480px), (max-height: 480px) { .header-outer, .cols-wrapper, .footer-outer, .google-footer-outer { padding: 0 16px; } .cols-wrapper { margin-top: 0; } .post-header .publishdate, .post .post-content { font-size: 16px; } .post .post-content { line-height: 28px; margin-bottom: 30px; } .post { margin-top: 30px; } .byline-author { display: block; font-size: 12px; line-height: 24px; margin-top: 6px; } #main .post .title a { font-weight: 500; color: #4c4c4c; color: rgba(0,0,0,.70); } #main .post .post-header { padding-bottom: 12px; } #main .post .post-header .published { margin-bottom: -8px; margin-top: 3px; } .post .read-more { display: block; margin-top: 14px; } .post .tr-caption { font-size: 12px; } #main .post .title a { font-size: 20px; line-height: 30px; } .post-content iframe { /* iframe won't keep aspect ratio when scaled down. */ max-height: 240px; } .post-content .separator img, .post-content .tr-caption-container img, .post-content iframe { margin-left: -16px; 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//]]> </script> <noscript> <img alt='' height='1' src='https://ad.doubleclick.net/ddm/activity/src=2542116;type=gblog;cat=googl0;ord=1?' width='1'/> </noscript>  <div class='header-outer'> <div class='header-inner'> <div class='section' id='header'><div class='widget Header' data-version='1' id='Header1'> <div class='header-left'> <div class='header-title'> <a class='google-logo' href='https://blog.chromium.org/'> <img alt="Chromium Blog" height="50" src="//1.bp.blogspot.com/-vkF7AFJOwBk/VkQxeAGi1mI/AAAAAAAARYo/57denvsQ8zA/s1600-r/logo_chromium.png"> </a> <a href='/.'> <h2> Chromium Blog </h2> </a> </div> <div class='header-desc'> News and developments from the open source browser project </div> </div> </div></div> </div> </div>  <div class='cols-wrapper loading'> <div class='col-main-wrapper'> <div class='col-main'> <div class='section' id='main'><div class='widget Blog' data-version='1' id='Blog1'> <div class='post' data-id='8328382129629393066' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://blog.chromium.org/2018/09/10-years-of-speed-in-chrome_11.html' itemprop='url' title='10 years of Speed in Chrome'> 10 years of Speed in Chrome </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Tuesday, September 11, 2018 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> <style> * { line-height: 1.38 !important; white-space: initial !important; } ul { font-size: 11pt !important; } li { line-height: 1.38 !important; } img { margin-bottom: 0 !important; } i { text-align: center !important; } </style> <span id="docs-internal-guid-ec9454c6-7fff-b0cd-07e3-80f5f797c50c"></span> <br /> <div dir="ltr" style="line-height: 1.38; margin-bottom: 10pt; margin-top: 10pt;"> <span style="background-color: transparent; color: black; font-size: 11pt; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit;">Speed has been one of Chrome’s <a href="https://www.chromium.org/developers/core-principles">four core principles</a>, since it was first launched ten years ago. We’ve always wanted to enable web developers to provide users with fast, engaging web experiences. On Chrome’s 10th birthday, we thought it would be fun to look at what we’ve done to improve speed over the years and what we’re doing next.</span></span></div> <h2> </h2> <h2> <br /> <br />Many components in the browser contribute to speed</h2> <div dir="ltr" style="line-height: 1.38; margin-bottom: 10pt; margin-top: 10pt;"> <span style="background-color: transparent; color: black; font-size: 11pt; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit;"><a href="https://v8project.blogspot.com/">V8</a> is Chrome’s JavaScript and WebAssembly engine. With web pages using an increasing amount of JavaScript, a fast engine to handle it is an important cornerstone. Over the years, we worked on a <a href="https://v8project.blogspot.com/2017/05/launching-ignition-and-turbofan.html">new JavaScript execution pipeline</a> for V8, launching <a href="https://github.com/v8/v8/wiki/Interpreter">Ignition</a> (a new interpreter) and <a href="https://github.com/v8/v8/wiki/TurboFan">TurboFan</a> (an optimizing compiler). These allowed us to improve performance on the Speedometer benchmark by 5-10%. <a href="https://blog.chromium.org/2015/03/new-javascript-techniques-for-rapid.html">Script streaming</a> enabled us to parse JavaScript on a background thread as soon as it began downloading, improving page loads by up to 10%. We then added <a href="https://v8project.blogspot.com/2018/03/background-compilation.html">background compilation</a> reducing main-thread compile time by up to 20%.</span></span></div> <div> <div style="text-align: center;"> <span id="docs-internal-guid-3be9ef50-7fff-5039-8ce7-893f54546c2e"><span style="font-family: "arial"; font-size: 11pt; vertical-align: baseline; white-space: pre-wrap;"></span></span></div> </div> <div> <div style="text-align: center;"> <div class="separator" style="clear: both; text-align: center;"> <span id="docs-internal-guid-adb96e8d-7fff-757e-66a0-2977db51a02d"><span style="font-family: "arial"; font-size: 10pt; vertical-align: baseline; white-space: pre-wrap;"><img height="294" src="https://lh3.googleusercontent.com/wI5N-pC7UdVTh0aIaAFZX_26Xj6P4r7W48qL7OGKwOAVUXGHsKl6CoQSGZ0itp-4epkeqdVvyd2TSA2s4LyIOSEJOdv6zqg4TrEBMM8eL9NjFgHPT58wDt4DbaeZnTeyXhakdMCd" style="border: none; transform: rotate(0rad);" width="510" /></span></span></div> <div class="separator" style="clear: both; text-align: center;"> <br /></div> <div class="separator" style="clear: both; text-align: left;"> <span style="font-size: 14.6667px; white-space: pre-wrap;">Our work on project <a href="https://v8project.blogspot.com/2016/04/jank-busters-part-two-orinoco.html">Orinoco</a> enabled concurrent garbage collection, freeing up the main thread and reducing jank. Over time, we also shifted to focusing on <a href="https://blog.chromium.org/2017/04/real-world-javascript-performance.html">real-world JavaScript performance</a>, helping us<a href="https://v8project.blogspot.com/2018/01/speedometer-2.html"> double the performance of the React.js runtime</a> and improve performance for libraries like Vue.js, Preact, and Angular up to 40%. Parallel, concurrent, and incremental garbage collection reduced garbage collection induced jank by 100× since the initial V8 commit. We also implemented <a href="https://webassembly.org/">WebAssembly</a>, enabling developers to run non-JavaScript code on the web with predictable performance, and launched the <a href="https://v8project.blogspot.com/2018/08/liftoff.html">Liftoff</a> baseline compiler to ensure fast startup times of WASM apps. These new components are just the latest in a <a href="https://v8project.blogspot.com/2018/09/10-years.html">10-year effort</a> that has improved V8's performance release-to-release for an improvement of 20x over the years.</span></div> <div class="separator" style="clear: both; text-align: center;"> </div> <span id="docs-internal-guid-3dd7b7e9-7fff-478d-262b-df6d1293a86b"><span style="font-family: inherit;"><span id="docs-internal-guid-a73d4e74-7fff-e00c-ef2f-298692bb6939"><span style="font-family: "arial"; font-size: 8pt; vertical-align: baseline; white-space: pre-wrap;"><img height="276" src="https://lh4.googleusercontent.com/PNhgg5pewdR5O3ffj_-cLuLVVsRXBh0KnL6SaZ3ebgsr7brseUBukaqHRQ761nmghrpXJ5zjDbWhFFTyCHuaodawNFWVZde7o8HVIgwBi6qPtXEI9I_njv_uYbKY_D2m94Znc2ps" style="border: none; transform: rotate(0rad);" title="Chart" width="602" /></span></span><i><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><br />V8 Bench scores for a range of Chrome releases over the years. V8 Bench is the predecessor to the old Octane benchmark. We've used it for this chart because unlike Octane, it can run in all Chrome versions, including the initial Chrome Beta.</span></i></span></span></div> <br /> <h2> <span id="docs-internal-guid-904141a1-7fff-059f-4ce2-c71524c532b0"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit; font-weight: normal;">Chrome has also played a key role in helping evolve network protocols and transport layers through <a href="https://www.chromium.org/spdy">SPDY</a>, <a href="https://developers.google.com/web/fundamentals/performance/http2/">HTTP/2</a> and <a href="https://www.chromium.org/quic">QUIC</a>. SPDY aimed to address limitations of HTTP/1.1 and became the foundation of HTTP/2 protocol, which is now supported by all modern browsers. In parallel, the team has been actively iterating on QUIC, which aims to further improve latency and user experience and now has an active IETF effort behind it. QUIC’s benefits are noticeable for video services like YouTube. Users reported <a href="https://blog.chromium.org/2015/04/a-quic-update-on-googles-experimental.html">30% fewer rebuffers</a> when watching videos over QUIC.</span></span></span></h2> <h2> <span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit; font-weight: normal;"><br /></span></span></h2> <h2> <span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit; font-weight: normal;"><br /></span></span></h2> <h2> <span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit; font-weight: normal;">Next up is Chrome's <a href="https://www.chromium.org/developers/the-rendering-critical-path">rendering pipeline</a>. This is responsible for ensuring webpages are responsive to users and display at 60 frames per second (fps). To display content at 60fps, Chrome has <a href="https://developers.google.com/web/fundamentals/performance/rendering/">16ms to render each frame</a>. This includes JavaScript execution, style, layout, paint and pushing pixels to the user's screen. Of this 16ms, the less Chrome uses, the more web developers have to delight their users. Improvements to our rendering pipeline have included o<a href="https://blog.chromium.org/2017/01/performance-improvements-in-chromes.html">ptimizing how we identify which elements in a page need to be redrawn</a> and better tracking visually non-overlapping sets. This reduced the time to paint new frames to the screen by up to 35%. </span></span></h2> <h2> </h2> </div> <h2> </h2> <h2> </h2> <div class="separator" style="clear: both; text-align: center;"> <i style="font-family: inherit;"><span id="docs-internal-guid-3e1547ad-7fff-319f-4365-460a4f4f1f68"><span style="font-family: "arial"; font-size: 10pt; font-style: normal; vertical-align: baseline; white-space: pre-wrap;"><img height="263" src="https://lh3.googleusercontent.com/-C3fECyNPJtEfNd44mxAf2NTcIKMfo8ThnA9KvK2AK1zfeRL5jt2vgutoYQSWBaiIORtMNmPY9164Yjadka3iuDbaTjOZ9Sa8ZVoBQA_QYi1x6kM03QoPjSpHrF-gjap1UEg66W5" style="border: none; transform: rotate(0rad);" width="568" /></span></span></i></div> <div class="separator" style="clear: both; text-align: center;"> <i style="font-family: inherit;">In 2015, a user-centric performance model called <a href="https://www.youtube.com/watch?v=wO9GGY17NXY">RAIL</a> was introduced by the Chrome team. We recently <a href="https://developers.google.com/web/fundamentals/performance/rail">updated</a> it.</i></div> <span id="docs-internal-guid-35b3a9ed-7fff-7dd3-1f0f-7db7a5c8df13"> </span> <br /> <div> <span style="font-family: inherit;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><br /></span></span> <span id="docs-internal-guid-35b3a9ed-7fff-7dd3-1f0f-7db7a5c8df13" style="font-family: inherit;"><span id="docs-internal-guid-59fe3fa1-7fff-358e-15b0-39dcb5daf08c"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;">What about memory consumption? Between Chrome 63 and 66, a ~20-30% improvement in renderer process memory usage was observed. We hope to continue exploring ways to build on this now that site-isolation has landed. Ignition and TurboFan <a href="https://v8project.blogspot.com/2017/05/launching-ignition-and-turbofan.html">reduced</a> V8's overall memory footprint, slimming it down by 5-10% on all devices and platforms supported by V8. Some sleuthing this year also discovered memory leaks impacting 7% of sites on the web, which we’ve now fully fixed. Many components contribute to Chrome’s speed including the DOM, CSS and storage systems like IndexedDB. To learn more about our improvements to performance, continue keeping an eye on the Chromium Blog. </span></span></span></div> <span id="docs-internal-guid-35b3a9ed-7fff-7dd3-1f0f-7db7a5c8df13"> </span> <br /> <h2> </h2> <h2> </h2> <h2> </h2> <h2> </h2> <h2> </h2> <h2> <br /><br /> <span id="docs-internal-guid-904141a1-7fff-059f-4ce2-c71524c532b0">Give web developers more power to measure and optimize their web pages</span></h2> <div> <span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit;"><br /></span></span> <span id="docs-internal-guid-6b1fcd26-7fff-4d16-2d52-c081b0984c60"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit;">Understanding where to start with improving your site can be a tedious process. To help, we explored several tools for understanding the <a href="https://developers.google.com/web/fundamentals/performance/speed-tools/#lab_data">lab</a> signals and <a href="https://developers.google.com/web/fundamentals/performance/speed-tools/#field_data">real-world</a> experience felt by your users. Over the years, the <a href="https://developers.google.com/web/tools/chrome-devtools/">Chrome DevTools</a> Performance panel became a powerful way to visualize the play-by-play breakdown of how web pages were displayed in a lab setting. To continue lowering the friction for finding <a href="https://developers.google.com/web/updates/2018/05/lighthouse">performance opportunities</a> sites had, we then worked on <a href="https://developers.google.com/web/tools/lighthouse/">Lighthouse</a> - a tool for analyzing the quality of your website, giving you clear measurements of your site’s performance and specific guidance for improving your users’ experience. Lighthouse can be accessed directly from inside the DevTools Audits panel, run from the command-line, or integrated with other development products like <a href="http://webpagetest.org/easy">WebPageTest</a>. </span></span></span></div> <div style="text-align: center;"> <div class="separator" style="clear: both; text-align: center;"> <span id="docs-internal-guid-a41d345d-7fff-2f6d-6afe-8f61d71db692"><span style="font-family: "arial"; font-size: 10pt; vertical-align: baseline; white-space: pre-wrap;"><img height="357" src="https://lh5.googleusercontent.com/XRvhueCTdF-RFhyFNjrOb-Dcv8XbDkAPLL0YOsXrLru9Fs7W8FoD_RF8uLCCcPwoRir3LS0d5rAYC362-MYtgaa2PrsPRxvaSyidJyaDkKXBjRdgCT1oyViTVAvPmJ8zdcPWzluk" style="border: none; transform: rotate(0rad);" width="602" /></span></span></div> </div> <div style="text-align: center;"> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><i>Lighthouse running in the Chrome DevTools Audits panel</i></span></span></div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"> </span> <br /> <div style="text-align: center;"> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><i></i></span></span></div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"> </span> <br /> <div> <span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><br />To complement the lab data provided by Lighthouse, we released the <a href="https://developers.google.com/web/tools/chrome-user-experience-report/">Chrome User Experience Report</a> to help developers get access to field metrics for the experience their users feel in the real-world, such as <a href="https://developers.google.com/web/fundamentals/performance/user-centric-performance-metrics">First Contentful Paint </a>and <a href="https://developers.google.com/web/updates/2018/07/first-input-delay-in-crux">First Input Delay</a>. Now, developers can build out their own custom site performance reports and track progress over millions of origins using the <a href="//g.co/chromeuxdash">CrUX Dashboard</a>.</span><br /> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"></span> <br /> <div dir="ltr" style="line-height: 1.38; margin-bottom: 10pt; margin-top: 0pt;"> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="background-color: transparent; color: black; font-size: 11pt; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit;">We also introduced a number of Web Platform capabilities to help developers optimize the loading of their sites. We shipped <a href="https://w3c.github.io/resource-hints/">Resource Hints</a> and </span></span></span><span style="color: #1155cc; font-family: "arial"; font-size: 10pt; vertical-align: baseline; white-space: pre-wrap;"><a href="https://developers.google.com/web/updates/2016/03/link-rel-preload" style="text-decoration-line: none;"><link rel=preload></a> </span><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;">to allow developers to inform the browser what resources are critical to load early on. Chrome was one of the first browsers to implement support for byte-saving approaches like <a href="https://github.com/google/brotli">Brotli for compression</a>, <a href="https://developers.googleblog.com/2015/02/smaller-fonts-with-woff-20-and-unicode.html">WOFF2 for smaller web fonts</a> and <a href="https://caniuse.com/webp">WebP support</a> for images. </span><br /> <span style="background-color: transparent; color: black; font-size: 11pt; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit;"> We’ve been excited to see an increasing number of browsers support these features over time. Chrome implemented <a href="https://developers.google.com/web/fundamentals/primers/service-workers/">Service Workers</a>, enabling offline caching & network resilience for repeat visits to pages. We’re delighted to see broad modern <a href="https://caniuse.com/#search=service%20workers">browser support</a> for the feature.</span></span></div> <div style="text-align: center;"> <div class="separator" style="clear: both; text-align: center;"> <span id="docs-internal-guid-3da3a969-7fff-b2c4-2fae-040348678c0f"><span style="font-family: "arial"; font-size: 10pt; vertical-align: baseline; white-space: pre-wrap;"><img height="231" src="https://lh5.googleusercontent.com/GWx5WzEFNFsbBSDu6hfD1iZtd5NPKV7lZ7T1tHYWqpHae5V2jqWoQCNL75nF517pcY16RMWZO24L0-YJVPwsEJBcMDdVmBal0MlvTuYYFwjOGbBIDPoWjVz4Ozy50u5T0StTdCoJ" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" width="602" /></span></span></div> </div> <div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"> </span></span> </span> <br /> <div dir="ltr" style="line-height: 1.38; margin-bottom: 10pt; margin-top: 10pt; text-align: left;"> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span id="docs-internal-guid-fa84e249-7fff-3449-fab3-162904bf636a"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit;">In fact, Google Search now uses Service Worker and <a href="https://developers.google.com/web/updates/2017/02/navigation-preload">navigation preload</a> for opportunistic caching on repeat searches. This led to a 2x improvement in page load times for repeat visits. </span></span></span></span></span></span></span><br /> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit;">As we look to the future, we are also excited about the potential that emerging standards like native lazy-loading for images & iframes, and image formats like <a href="https://en.wikipedia.org/wiki/AV1">AV1</a> have to help deliver content to users efficiently.</span></span></span></span><br /> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit;"><br /></span></span></span></span></div> <div> <h2> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-c2f8ac14-7fff-83c7-2be1-c654ab12c56b">Enjoy more of the web on your data-plan with Chrome</span></span></span></span></span></h2> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-c2f8ac14-7fff-83c7-2be1-c654ab12c56b"></span></span> </span></span></span> <br /> <div dir="ltr" style="font-size: 11pt; line-height: 1.38; margin-bottom: 10pt; margin-top: 10pt; text-align: left; white-space: pre-wrap;"> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-c2f8ac14-7fff-83c7-2be1-c654ab12c56b"><span style="font-family: inherit;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;">Over the last 10 years, the size of web pages has been <a href="https://httparchive.org/reports/state-of-the-web#bytesTotal">ever-increasing</a>, but for many users coming online for the first time, data can be prohibitively expensive or painfully slow. To help, Chrome released data-conscious features over the years like Chrome’s Data Saver. Data Saver intelligently optimizes pages, saving up to 92% on data consumption. </span></span></span></span></span></span></span><br /> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><br /></span></span></span></span> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;">Going ahead, we are exploring new ways to help you save data. For users on the slowest connections, we've been working on <a href="https://play.google.com/store/apps/details?id=com.android.chrome&hl=en">Chrome for Android</a>, allowing for smarter page optimizations to show essential content earlier. These page transformations load far faster than the full page, and we're continuing to improve our fidelity, coverage, and performance.<br /> </span></span></span></span><br /> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;">We've also been experimenting with putting guardrails in place for users who are data- or network- constrained. For example, we're exploring bringing <a href="https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/czmmZUd4Vww/1-H6j-zdAwAJ">native lazy-loading</a> to Chrome, as well as providing users the option to stop additional requests from a page when it uses a lot of data. </span></span></span></span></div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-c2f8ac14-7fff-83c7-2be1-c654ab12c56b"> </span></span> </span></span></span><br /> <h2> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><br /></span></span></span></span></h2> <h2> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;">We’re just getting started...</span></span></span></span></h2> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><br /></span></span></span> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-family: inherit; font-size: 11pt; line-height: 1.38; white-space: pre-wrap;">Together, these changes help developers and businesses deliver useful content to their users sooner. We know there’s still work to be done. Here’s to offering improvements to page load performance over another 10 years! </span></span></span></span><br /> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit; font-size: 11pt; line-height: 1.38; white-space: pre-wrap;"><br /></span></span> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"> </span> </span></span></span><br /> <div style="font-size: 11pt; white-space: pre-wrap;"> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit; font-size: 11pt; vertical-align: baseline;">Posted by Addy Osmani, JavaScript Janitor</span></span></span></span></span></div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"> </span></span></span></span></div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"> </span></span></span></div> </div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"> </span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> <style> * { line-height: 1.38 !important; white-space: initial !important; } ul { font-size: 11pt !important; } li { line-height: 1.38 !important; } img { margin-bottom: 0 !important; } i { text-align: center !important; } </style> <span id="docs-internal-guid-ec9454c6-7fff-b0cd-07e3-80f5f797c50c"></span> <br /> <div dir="ltr" style="line-height: 1.38; margin-bottom: 10pt; margin-top: 10pt;"> <span style="background-color: transparent; color: black; font-size: 11pt; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit;">Speed has been one of Chrome’s <a href="https://www.chromium.org/developers/core-principles">four core principles</a>, since it was first launched ten years ago. We’ve always wanted to enable web developers to provide users with fast, engaging web experiences. On Chrome’s 10th birthday, we thought it would be fun to look at what we’ve done to improve speed over the years and what we’re doing next.</span></span></div> <h2> </h2> <h2> <br /> <br />Many components in the browser contribute to speed</h2> <div dir="ltr" style="line-height: 1.38; margin-bottom: 10pt; margin-top: 10pt;"> <span style="background-color: transparent; color: black; font-size: 11pt; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit;"><a href="https://v8project.blogspot.com/">V8</a> is Chrome’s JavaScript and WebAssembly engine. With web pages using an increasing amount of JavaScript, a fast engine to handle it is an important cornerstone. Over the years, we worked on a <a href="https://v8project.blogspot.com/2017/05/launching-ignition-and-turbofan.html">new JavaScript execution pipeline</a> for V8, launching <a href="https://github.com/v8/v8/wiki/Interpreter">Ignition</a> (a new interpreter) and <a href="https://github.com/v8/v8/wiki/TurboFan">TurboFan</a> (an optimizing compiler). These allowed us to improve performance on the Speedometer benchmark by 5-10%. <a href="https://blog.chromium.org/2015/03/new-javascript-techniques-for-rapid.html">Script streaming</a> enabled us to parse JavaScript on a background thread as soon as it began downloading, improving page loads by up to 10%. We then added <a href="https://v8project.blogspot.com/2018/03/background-compilation.html">background compilation</a> reducing main-thread compile time by up to 20%.</span></span></div> <div> <div style="text-align: center;"> <span id="docs-internal-guid-3be9ef50-7fff-5039-8ce7-893f54546c2e"><span style="font-family: "arial"; font-size: 11pt; vertical-align: baseline; white-space: pre-wrap;"></span></span></div> </div> <div> <div style="text-align: center;"> <div class="separator" style="clear: both; text-align: center;"> <span id="docs-internal-guid-adb96e8d-7fff-757e-66a0-2977db51a02d"><span style="font-family: "arial"; font-size: 10pt; vertical-align: baseline; white-space: pre-wrap;"><img height="294" src="https://lh3.googleusercontent.com/wI5N-pC7UdVTh0aIaAFZX_26Xj6P4r7W48qL7OGKwOAVUXGHsKl6CoQSGZ0itp-4epkeqdVvyd2TSA2s4LyIOSEJOdv6zqg4TrEBMM8eL9NjFgHPT58wDt4DbaeZnTeyXhakdMCd" style="border: none; transform: rotate(0rad);" width="510" /></span></span></div> <div class="separator" style="clear: both; text-align: center;"> <br /></div> <div class="separator" style="clear: both; text-align: left;"> <span style="font-size: 14.6667px; white-space: pre-wrap;">Our work on project <a href="https://v8project.blogspot.com/2016/04/jank-busters-part-two-orinoco.html">Orinoco</a> enabled concurrent garbage collection, freeing up the main thread and reducing jank. Over time, we also shifted to focusing on <a href="https://blog.chromium.org/2017/04/real-world-javascript-performance.html">real-world JavaScript performance</a>, helping us<a href="https://v8project.blogspot.com/2018/01/speedometer-2.html"> double the performance of the React.js runtime</a> and improve performance for libraries like Vue.js, Preact, and Angular up to 40%. Parallel, concurrent, and incremental garbage collection reduced garbage collection induced jank by 100× since the initial V8 commit. We also implemented <a href="https://webassembly.org/">WebAssembly</a>, enabling developers to run non-JavaScript code on the web with predictable performance, and launched the <a href="https://v8project.blogspot.com/2018/08/liftoff.html">Liftoff</a> baseline compiler to ensure fast startup times of WASM apps. These new components are just the latest in a <a href="https://v8project.blogspot.com/2018/09/10-years.html">10-year effort</a> that has improved V8's performance release-to-release for an improvement of 20x over the years.</span></div> <div class="separator" style="clear: both; text-align: center;"> </div> <span id="docs-internal-guid-3dd7b7e9-7fff-478d-262b-df6d1293a86b"><span style="font-family: inherit;"><span id="docs-internal-guid-a73d4e74-7fff-e00c-ef2f-298692bb6939"><span style="font-family: "arial"; font-size: 8pt; vertical-align: baseline; white-space: pre-wrap;"><img height="276" src="https://lh4.googleusercontent.com/PNhgg5pewdR5O3ffj_-cLuLVVsRXBh0KnL6SaZ3ebgsr7brseUBukaqHRQ761nmghrpXJ5zjDbWhFFTyCHuaodawNFWVZde7o8HVIgwBi6qPtXEI9I_njv_uYbKY_D2m94Znc2ps" style="border: none; transform: rotate(0rad);" title="Chart" width="602" /></span></span><i><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><br />V8 Bench scores for a range of Chrome releases over the years. V8 Bench is the predecessor to the old Octane benchmark. We've used it for this chart because unlike Octane, it can run in all Chrome versions, including the initial Chrome Beta.</span></i></span></span></div> <br /> <h2> <span id="docs-internal-guid-904141a1-7fff-059f-4ce2-c71524c532b0"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit; font-weight: normal;">Chrome has also played a key role in helping evolve network protocols and transport layers through <a href="https://www.chromium.org/spdy">SPDY</a>, <a href="https://developers.google.com/web/fundamentals/performance/http2/">HTTP/2</a> and <a href="https://www.chromium.org/quic">QUIC</a>. SPDY aimed to address limitations of HTTP/1.1 and became the foundation of HTTP/2 protocol, which is now supported by all modern browsers. In parallel, the team has been actively iterating on QUIC, which aims to further improve latency and user experience and now has an active IETF effort behind it. QUIC’s benefits are noticeable for video services like YouTube. Users reported <a href="https://blog.chromium.org/2015/04/a-quic-update-on-googles-experimental.html">30% fewer rebuffers</a> when watching videos over QUIC.</span></span></span></h2> <h2> <span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit; font-weight: normal;"><br /></span></span></h2> <h2> <span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit; font-weight: normal;"><br /></span></span></h2> <h2> <span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit; font-weight: normal;">Next up is Chrome's <a href="https://www.chromium.org/developers/the-rendering-critical-path">rendering pipeline</a>. This is responsible for ensuring webpages are responsive to users and display at 60 frames per second (fps). To display content at 60fps, Chrome has <a href="https://developers.google.com/web/fundamentals/performance/rendering/">16ms to render each frame</a>. This includes JavaScript execution, style, layout, paint and pushing pixels to the user's screen. Of this 16ms, the less Chrome uses, the more web developers have to delight their users. Improvements to our rendering pipeline have included o<a href="https://blog.chromium.org/2017/01/performance-improvements-in-chromes.html">ptimizing how we identify which elements in a page need to be redrawn</a> and better tracking visually non-overlapping sets. This reduced the time to paint new frames to the screen by up to 35%. </span></span></h2> <h2> </h2> </div> <h2> </h2> <h2> </h2> <div class="separator" style="clear: both; text-align: center;"> <i style="font-family: inherit;"><span id="docs-internal-guid-3e1547ad-7fff-319f-4365-460a4f4f1f68"><span style="font-family: "arial"; font-size: 10pt; font-style: normal; vertical-align: baseline; white-space: pre-wrap;"><img height="263" src="https://lh3.googleusercontent.com/-C3fECyNPJtEfNd44mxAf2NTcIKMfo8ThnA9KvK2AK1zfeRL5jt2vgutoYQSWBaiIORtMNmPY9164Yjadka3iuDbaTjOZ9Sa8ZVoBQA_QYi1x6kM03QoPjSpHrF-gjap1UEg66W5" style="border: none; transform: rotate(0rad);" width="568" /></span></span></i></div> <div class="separator" style="clear: both; text-align: center;"> <i style="font-family: inherit;">In 2015, a user-centric performance model called <a href="https://www.youtube.com/watch?v=wO9GGY17NXY">RAIL</a> was introduced by the Chrome team. We recently <a href="https://developers.google.com/web/fundamentals/performance/rail">updated</a> it.</i></div> <span id="docs-internal-guid-35b3a9ed-7fff-7dd3-1f0f-7db7a5c8df13"> </span> <br /> <div> <span style="font-family: inherit;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><br /></span></span> <span id="docs-internal-guid-35b3a9ed-7fff-7dd3-1f0f-7db7a5c8df13" style="font-family: inherit;"><span id="docs-internal-guid-59fe3fa1-7fff-358e-15b0-39dcb5daf08c"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;">What about memory consumption? Between Chrome 63 and 66, a ~20-30% improvement in renderer process memory usage was observed. We hope to continue exploring ways to build on this now that site-isolation has landed. Ignition and TurboFan <a href="https://v8project.blogspot.com/2017/05/launching-ignition-and-turbofan.html">reduced</a> V8's overall memory footprint, slimming it down by 5-10% on all devices and platforms supported by V8. Some sleuthing this year also discovered memory leaks impacting 7% of sites on the web, which we’ve now fully fixed. Many components contribute to Chrome’s speed including the DOM, CSS and storage systems like IndexedDB. To learn more about our improvements to performance, continue keeping an eye on the Chromium Blog. </span></span></span></div> <span id="docs-internal-guid-35b3a9ed-7fff-7dd3-1f0f-7db7a5c8df13"> </span> <br /> <h2> </h2> <h2> </h2> <h2> </h2> <h2> </h2> <h2> </h2> <h2> <br /><br /> <span id="docs-internal-guid-904141a1-7fff-059f-4ce2-c71524c532b0">Give web developers more power to measure and optimize their web pages</span></h2> <div> <span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit;"><br /></span></span> <span id="docs-internal-guid-6b1fcd26-7fff-4d16-2d52-c081b0984c60"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit;">Understanding where to start with improving your site can be a tedious process. To help, we explored several tools for understanding the <a href="https://developers.google.com/web/fundamentals/performance/speed-tools/#lab_data">lab</a> signals and <a href="https://developers.google.com/web/fundamentals/performance/speed-tools/#field_data">real-world</a> experience felt by your users. Over the years, the <a href="https://developers.google.com/web/tools/chrome-devtools/">Chrome DevTools</a> Performance panel became a powerful way to visualize the play-by-play breakdown of how web pages were displayed in a lab setting. To continue lowering the friction for finding <a href="https://developers.google.com/web/updates/2018/05/lighthouse">performance opportunities</a> sites had, we then worked on <a href="https://developers.google.com/web/tools/lighthouse/">Lighthouse</a> - a tool for analyzing the quality of your website, giving you clear measurements of your site’s performance and specific guidance for improving your users’ experience. Lighthouse can be accessed directly from inside the DevTools Audits panel, run from the command-line, or integrated with other development products like <a href="http://webpagetest.org/easy">WebPageTest</a>. </span></span></span></div> <div style="text-align: center;"> <div class="separator" style="clear: both; text-align: center;"> <span id="docs-internal-guid-a41d345d-7fff-2f6d-6afe-8f61d71db692"><span style="font-family: "arial"; font-size: 10pt; vertical-align: baseline; white-space: pre-wrap;"><img height="357" src="https://lh5.googleusercontent.com/XRvhueCTdF-RFhyFNjrOb-Dcv8XbDkAPLL0YOsXrLru9Fs7W8FoD_RF8uLCCcPwoRir3LS0d5rAYC362-MYtgaa2PrsPRxvaSyidJyaDkKXBjRdgCT1oyViTVAvPmJ8zdcPWzluk" style="border: none; transform: rotate(0rad);" width="602" /></span></span></div> </div> <div style="text-align: center;"> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><i>Lighthouse running in the Chrome DevTools Audits panel</i></span></span></div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"> </span> <br /> <div style="text-align: center;"> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><i></i></span></span></div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"> </span> <br /> <div> <span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><br />To complement the lab data provided by Lighthouse, we released the <a href="https://developers.google.com/web/tools/chrome-user-experience-report/">Chrome User Experience Report</a> to help developers get access to field metrics for the experience their users feel in the real-world, such as <a href="https://developers.google.com/web/fundamentals/performance/user-centric-performance-metrics">First Contentful Paint </a>and <a href="https://developers.google.com/web/updates/2018/07/first-input-delay-in-crux">First Input Delay</a>. Now, developers can build out their own custom site performance reports and track progress over millions of origins using the <a href="//g.co/chromeuxdash">CrUX Dashboard</a>.</span><br /> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"></span> <br /> <div dir="ltr" style="line-height: 1.38; margin-bottom: 10pt; margin-top: 0pt;"> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="background-color: transparent; color: black; font-size: 11pt; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit;">We also introduced a number of Web Platform capabilities to help developers optimize the loading of their sites. We shipped <a href="https://w3c.github.io/resource-hints/">Resource Hints</a> and </span></span></span><span style="color: #1155cc; font-family: "arial"; font-size: 10pt; vertical-align: baseline; white-space: pre-wrap;"><a href="https://developers.google.com/web/updates/2016/03/link-rel-preload" style="text-decoration-line: none;"><link rel=preload></a> </span><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;">to allow developers to inform the browser what resources are critical to load early on. Chrome was one of the first browsers to implement support for byte-saving approaches like <a href="https://github.com/google/brotli">Brotli for compression</a>, <a href="https://developers.googleblog.com/2015/02/smaller-fonts-with-woff-20-and-unicode.html">WOFF2 for smaller web fonts</a> and <a href="https://caniuse.com/webp">WebP support</a> for images. </span><br /> <span style="background-color: transparent; color: black; font-size: 11pt; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: inherit;"> We’ve been excited to see an increasing number of browsers support these features over time. Chrome implemented <a href="https://developers.google.com/web/fundamentals/primers/service-workers/">Service Workers</a>, enabling offline caching & network resilience for repeat visits to pages. We’re delighted to see broad modern <a href="https://caniuse.com/#search=service%20workers">browser support</a> for the feature.</span></span></div> <div style="text-align: center;"> <div class="separator" style="clear: both; text-align: center;"> <span id="docs-internal-guid-3da3a969-7fff-b2c4-2fae-040348678c0f"><span style="font-family: "arial"; font-size: 10pt; vertical-align: baseline; white-space: pre-wrap;"><img height="231" src="https://lh5.googleusercontent.com/GWx5WzEFNFsbBSDu6hfD1iZtd5NPKV7lZ7T1tHYWqpHae5V2jqWoQCNL75nF517pcY16RMWZO24L0-YJVPwsEJBcMDdVmBal0MlvTuYYFwjOGbBIDPoWjVz4Ozy50u5T0StTdCoJ" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" width="602" /></span></span></div> </div> <div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"> </span></span> </span> <br /> <div dir="ltr" style="line-height: 1.38; margin-bottom: 10pt; margin-top: 10pt; text-align: left;"> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span id="docs-internal-guid-fa84e249-7fff-3449-fab3-162904bf636a"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit;">In fact, Google Search now uses Service Worker and <a href="https://developers.google.com/web/updates/2017/02/navigation-preload">navigation preload</a> for opportunistic caching on repeat searches. This led to a 2x improvement in page load times for repeat visits. </span></span></span></span></span></span></span><br /> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit;">As we look to the future, we are also excited about the potential that emerging standards like native lazy-loading for images & iframes, and image formats like <a href="https://en.wikipedia.org/wiki/AV1">AV1</a> have to help deliver content to users efficiently.</span></span></span></span><br /> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit;"><br /></span></span></span></span></div> <div> <h2> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-c2f8ac14-7fff-83c7-2be1-c654ab12c56b">Enjoy more of the web on your data-plan with Chrome</span></span></span></span></span></h2> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-c2f8ac14-7fff-83c7-2be1-c654ab12c56b"></span></span> </span></span></span> <br /> <div dir="ltr" style="font-size: 11pt; line-height: 1.38; margin-bottom: 10pt; margin-top: 10pt; text-align: left; white-space: pre-wrap;"> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-c2f8ac14-7fff-83c7-2be1-c654ab12c56b"><span style="font-family: inherit;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;">Over the last 10 years, the size of web pages has been <a href="https://httparchive.org/reports/state-of-the-web#bytesTotal">ever-increasing</a>, but for many users coming online for the first time, data can be prohibitively expensive or painfully slow. To help, Chrome released data-conscious features over the years like Chrome’s Data Saver. Data Saver intelligently optimizes pages, saving up to 92% on data consumption. </span></span></span></span></span></span></span><br /> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><br /></span></span></span></span> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;">Going ahead, we are exploring new ways to help you save data. For users on the slowest connections, we've been working on <a href="https://play.google.com/store/apps/details?id=com.android.chrome&hl=en">Chrome for Android</a>, allowing for smarter page optimizations to show essential content earlier. These page transformations load far faster than the full page, and we're continuing to improve our fidelity, coverage, and performance.<br /> </span></span></span></span><br /> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit;"><span style="font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;">We've also been experimenting with putting guardrails in place for users who are data- or network- constrained. For example, we're exploring bringing <a href="https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/czmmZUd4Vww/1-H6j-zdAwAJ">native lazy-loading</a> to Chrome, as well as providing users the option to stop additional requests from a page when it uses a lot of data. </span></span></span></span></div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-c2f8ac14-7fff-83c7-2be1-c654ab12c56b"> </span></span> </span></span></span><br /> <h2> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><br /></span></span></span></span></h2> <h2> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;">We’re just getting started...</span></span></span></span></h2> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><br /></span></span></span> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-family: inherit; font-size: 11pt; line-height: 1.38; white-space: pre-wrap;">Together, these changes help developers and businesses deliver useful content to their users sooner. We know there’s still work to be done. Here’s to offering improvements to page load performance over another 10 years! </span></span></span></span><br /> <span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit; font-size: 11pt; line-height: 1.38; white-space: pre-wrap;"><br /></span></span> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"> </span> </span></span></span><br /> <div style="font-size: 11pt; white-space: pre-wrap;"> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span style="font-family: inherit; font-size: 11pt; vertical-align: baseline;">Posted by Addy Osmani, JavaScript Janitor</span></span></span></span></span></div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"> </span></span></span></span></div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"><span style="font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline;"><span id="docs-internal-guid-a9133585-7fff-e2e5-75a8-bc52326931a5"> </span></span></span></div> </div> <span id="docs-internal-guid-7c7aa7fa-7fff-9d2a-0a25-71052aac9fc5"> </span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Chromium Blog:10 years of Speed in Chrome&url=https://blog.chromium.org/2018/09/10-years-of-speed-in-chrome_11.html&via=ChromiumDev'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> </span> <span class='fb-custom social-wrapper' data-href='https://www.facebook.com/sharer.php?u=https://blog.chromium.org/2018/09/10-years-of-speed-in-chrome_11.html'> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </span> </div> <div class='post-footer'> <div class='cmt_iframe_holder' data-href='https://blog.chromium.org/2018/09/10-years-of-speed-in-chrome_11.html' data-viewtype='FILTERED_POSTMOD'></div> <a href='https://plus.google.com/112374322230920073195' rel='author' style='display:none;'> Google </a> <div class='label-footer'> <span class='labels-caption'> Labels: </span> <span class='labels'> <a class='label' href='https://blog.chromium.org/search/label/10th%20birthday' rel='tag'> 10th birthday </a> , <a class='label' href='https://blog.chromium.org/search/label/birthday' rel='tag'> birthday </a> , <a class='label' href='https://blog.chromium.org/search/label/chrome' rel='tag'> chrome </a> , <a class='label' href='https://blog.chromium.org/search/label/performance' rel='tag'> performance </a> , <a class='label' href='https://blog.chromium.org/search/label/speed' rel='tag'> speed </a> , <a class='label' href='https://blog.chromium.org/search/label/v8' rel='tag'> v8 </a> </span> </div> </div> </div> <div class='post' data-id='671492812605003893' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://blog.chromium.org/2012/08/octane-javascript-benchmark-suite-for.html' itemprop='url' title='Octane: the JavaScript benchmark suite for the modern web'> Octane: the JavaScript benchmark suite for the modern web </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Tuesday, August 21, 2012 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> The web is evolving and so should the JavaScript benchmarks that measure its performance. Today, we are releasing <a href="http://octane-benchmark.googlecode.com/svn/latest/index.html">Octane</a>, a JavaScript benchmark suite that aims to measure a browser’s performance when running the complex and demanding web applications that users interact with daily.<br /> <br /> Most of the existing JavaScript benchmarks run artificial tests that were created on an ad-hoc basis to stress a specific JavaScript feature. Octane breaks with this tradition and extends the former V8 Benchmark Suite with 5 new benchmarks created from full, unaltered [1], well-known web applications and libraries. A high score in the new benchmarks directly translates to better and smoother performance in similar web applications.<br /> <br /> Here is an overview of the new tests:<br /> <ul> <li><b>Box2DWeb</b> runs a JavaScript port of a popular <a href="http://code.google.com/p/box2dweb/">2D physics engine</a> that is behind many well-known simulations and web games. </li> <li><b>Mandreel</b> puts a JavaScript port of the 3D Bullet Engine to the test with a twist: The original C++ source code for the engine is translated to JavaScript by Onan Games’ <a href="http://www.mandreel.com/">Mandreel</a> compiler, which is also used in countless web-based games. </li> <li><b>Pdf.js</b> is based on <a href="http://mozilla.github.com/pdf.js/">Mozilla’s PDF reader</a> and shows how Javascript applications can replace complex native browser plug-ins. It measures how fast the browser decodes a sample PDF document. </li> <li><b>GB Emulator</b> is derived from an <a href="https://github.com/grantgalitz/GameBoy-Online">open source emulator</a> of a famous game console running a 3D demo. </li> <li><b>CodeLoad</b> measures how quickly a JavaScript engine can bootstrap commonly used JavaScript libraries and start executing code in them. The source for this test is derived from open source libraries (<a href="https://developers.google.com/closure/">Closure</a>, <a href="http://jquery.com/">jQuery</a>). </li> </ul> Besides an expanded <a href="https://developers.google.com/octane/benchmark">set of benchmarks</a>, Octane also has an interface that makes it easier to read and that adapts automatically to tablet and mobile screens.<br /> <br /> <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqA5xhJbeQ1-AlZeGH0FIBiR-IjP7xS8fn2pGAjgUVCryBSB2ZXhVSAyHjUyEH460o-B_WRA9A86z3m59Oq7VGSr04poTHTraEMlkWqnwGIq0aFCopS6YG_pp8zxcN7XO3Z72_uOwuB8A/s1600/Screen+shot+2012-08-21+at+7.51.11+AM.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="143" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqA5xhJbeQ1-AlZeGH0FIBiR-IjP7xS8fn2pGAjgUVCryBSB2ZXhVSAyHjUyEH460o-B_WRA9A86z3m59Oq7VGSr04poTHTraEMlkWqnwGIq0aFCopS6YG_pp8zxcN7XO3Z72_uOwuB8A/s400/Screen+shot+2012-08-21+at+7.51.11+AM.png" width="400" /></a> <br /> <br /> You can try out <a href="http://octane-benchmark.googlecode.com/svn/latest/index.html">Octane</a> yourself, browse the <a href="http://code.google.com/p/octane-benchmark/">source code</a>, or read more about each benchmark at the <a href="http://developers.google.com/octane">Octane site</a>. Still have some questions? Have a look at the <a href="http://developers.google.com/octane/faq">FAQ page</a>.<br /> <br /> [1] <i>Beside glue logic and emulation of canvas / DOM interaction where necessary. </i><br /> <span class="post-author"><br /></span> <span class="post-author">Posted by Stefano Cazzulani, Product Manager</span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> The web is evolving and so should the JavaScript benchmarks that measure its performance. Today, we are releasing <a href="http://octane-benchmark.googlecode.com/svn/latest/index.html">Octane</a>, a JavaScript benchmark suite that aims to measure a browser’s performance when running the complex and demanding web applications that users interact with daily.<br /> <br /> Most of the existing JavaScript benchmarks run artificial tests that were created on an ad-hoc basis to stress a specific JavaScript feature. Octane breaks with this tradition and extends the former V8 Benchmark Suite with 5 new benchmarks created from full, unaltered [1], well-known web applications and libraries. A high score in the new benchmarks directly translates to better and smoother performance in similar web applications.<br /> <br /> Here is an overview of the new tests:<br /> <ul> <li><b>Box2DWeb</b> runs a JavaScript port of a popular <a href="http://code.google.com/p/box2dweb/">2D physics engine</a> that is behind many well-known simulations and web games. </li> <li><b>Mandreel</b> puts a JavaScript port of the 3D Bullet Engine to the test with a twist: The original C++ source code for the engine is translated to JavaScript by Onan Games’ <a href="http://www.mandreel.com/">Mandreel</a> compiler, which is also used in countless web-based games. </li> <li><b>Pdf.js</b> is based on <a href="http://mozilla.github.com/pdf.js/">Mozilla’s PDF reader</a> and shows how Javascript applications can replace complex native browser plug-ins. It measures how fast the browser decodes a sample PDF document. </li> <li><b>GB Emulator</b> is derived from an <a href="https://github.com/grantgalitz/GameBoy-Online">open source emulator</a> of a famous game console running a 3D demo. </li> <li><b>CodeLoad</b> measures how quickly a JavaScript engine can bootstrap commonly used JavaScript libraries and start executing code in them. The source for this test is derived from open source libraries (<a href="https://developers.google.com/closure/">Closure</a>, <a href="http://jquery.com/">jQuery</a>). </li> </ul> Besides an expanded <a href="https://developers.google.com/octane/benchmark">set of benchmarks</a>, Octane also has an interface that makes it easier to read and that adapts automatically to tablet and mobile screens.<br /> <br /> <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqA5xhJbeQ1-AlZeGH0FIBiR-IjP7xS8fn2pGAjgUVCryBSB2ZXhVSAyHjUyEH460o-B_WRA9A86z3m59Oq7VGSr04poTHTraEMlkWqnwGIq0aFCopS6YG_pp8zxcN7XO3Z72_uOwuB8A/s1600/Screen+shot+2012-08-21+at+7.51.11+AM.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="143" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqA5xhJbeQ1-AlZeGH0FIBiR-IjP7xS8fn2pGAjgUVCryBSB2ZXhVSAyHjUyEH460o-B_WRA9A86z3m59Oq7VGSr04poTHTraEMlkWqnwGIq0aFCopS6YG_pp8zxcN7XO3Z72_uOwuB8A/s400/Screen+shot+2012-08-21+at+7.51.11+AM.png" width="400" /></a> <br /> <br /> You can try out <a href="http://octane-benchmark.googlecode.com/svn/latest/index.html">Octane</a> yourself, browse the <a href="http://code.google.com/p/octane-benchmark/">source code</a>, or read more about each benchmark at the <a href="http://developers.google.com/octane">Octane site</a>. Still have some questions? Have a look at the <a href="http://developers.google.com/octane/faq">FAQ page</a>.<br /> <br /> [1] <i>Beside glue logic and emulation of canvas / DOM interaction where necessary. </i><br /> <span class="post-author"><br /></span> <span class="post-author">Posted by Stefano Cazzulani, Product Manager</span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Chromium Blog:Octane: the JavaScript benchmark suite for the modern web&url=https://blog.chromium.org/2012/08/octane-javascript-benchmark-suite-for.html&via=ChromiumDev'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> </span> <span class='fb-custom social-wrapper' data-href='https://www.facebook.com/sharer.php?u=https://blog.chromium.org/2012/08/octane-javascript-benchmark-suite-for.html'> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </span> </div> <div class='post-footer'> <div class='cmt_iframe_holder' data-href='https://blog.chromium.org/2012/08/octane-javascript-benchmark-suite-for.html' data-viewtype='FILTERED_POSTMOD'></div> <a href='https://plus.google.com/112374322230920073195' rel='author' style='display:none;'> Google </a> <div class='label-footer'> <span class='labels-caption'> Labels: </span> <span class='labels'> <a class='label' href='https://blog.chromium.org/search/label/octane' rel='tag'> octane </a> , <a class='label' href='https://blog.chromium.org/search/label/v8' rel='tag'> v8 </a> </span> </div> </div> </div> <div class='post' data-id='5403267787218892001' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://blog.chromium.org/2012/05/better-code-optimization-decisions-for.html' itemprop='url' title='Better code optimization decisions for V8'> Better code optimization decisions for V8 </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Tuesday, May 1, 2012 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> As of current dev and beta channel releases, V8 uses a new algorithm based on counters to decide which functions to optimize. This greatly increases performance for small JavaScript programs. For example, on the SunSpider benchmark, which focuses on extremely short-running tests, V8's speed improved by about 25%.<br /> <br /> <div class="separator" style="text-align: center;"> <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJhoICTEPyNqsA6cXst-FtqOVPdoN9yQCpGeBlUmTnCWQpb1S99PSpsw1NzUEgFdpj0n6ZVZvYdcu1KR2-rK5voecDUT7kYxiF3CmWsY-jrg6SIJXfAgEo5283PhQtaCmy_KNYndIoXKI/s1600/v8_sunspider.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJhoICTEPyNqsA6cXst-FtqOVPdoN9yQCpGeBlUmTnCWQpb1S99PSpsw1NzUEgFdpj0n6ZVZvYdcu1KR2-rK5voecDUT7kYxiF3CmWsY-jrg6SIJXfAgEo5283PhQtaCmy_KNYndIoXKI/s1600/v8_sunspider.png" /></a></div> <br /> When executing JavaScript, V8 at first compiles it to machine code with a very fast compiler that doesn't optimize the code it produces. V8 has a second, <a href="http://blog.chromium.org/2010/12/new-crankshaft-for-v8.html">optimizing compiler</a> that generates much faster machine code, but takes much more time to do so, so it has to be used selectively. That's why V8 must try to predict which functions will benefit most from optimization, and carefully decide when to optimize them.<br /> <br /> In the past, V8 stopped once every millisecond to look at currently running functions, and eventually optimized them. For long-running programs, this worked great, but short-running programs often finished before they could benefit much from the optimizing compiler -- a single millisecond can be a long time to wait before optimizing! In addition, V8 often made different optimization decisions each time a JavaScript program ran, sometimes overlooking small but performance-critical functions.<br /> <br /> The new version of V8 makes earlier and more repeatable optimization decisions by analyzing the running program in more detail. It uses counters to keep track of how often JavaScript functions are called and loops are executed in a program, approximating the time spent inside each function. That way V8 is able to quickly gather fine-grained information about performance bottlenecks in a JavaScript program, and to make sure that the optimizing compiler's efforts are spent on those functions that deserve it most.<br /> <br /> The new algorithm is contained in the current beta channel releases -- go <a href="https://www.google.com/landing/chrome/beta/">give it a spin</a> now!<br /> <br /> <span class="post-author">Posted by Jakob Kummerow, Software Engineer</span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> As of current dev and beta channel releases, V8 uses a new algorithm based on counters to decide which functions to optimize. This greatly increases performance for small JavaScript programs. For example, on the SunSpider benchmark, which focuses on extremely short-running tests, V8's speed improved by about 25%.<br /> <br /> <div class="separator" style="text-align: center;"> <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJhoICTEPyNqsA6cXst-FtqOVPdoN9yQCpGeBlUmTnCWQpb1S99PSpsw1NzUEgFdpj0n6ZVZvYdcu1KR2-rK5voecDUT7kYxiF3CmWsY-jrg6SIJXfAgEo5283PhQtaCmy_KNYndIoXKI/s1600/v8_sunspider.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJhoICTEPyNqsA6cXst-FtqOVPdoN9yQCpGeBlUmTnCWQpb1S99PSpsw1NzUEgFdpj0n6ZVZvYdcu1KR2-rK5voecDUT7kYxiF3CmWsY-jrg6SIJXfAgEo5283PhQtaCmy_KNYndIoXKI/s1600/v8_sunspider.png" /></a></div> <br /> When executing JavaScript, V8 at first compiles it to machine code with a very fast compiler that doesn't optimize the code it produces. V8 has a second, <a href="http://blog.chromium.org/2010/12/new-crankshaft-for-v8.html">optimizing compiler</a> that generates much faster machine code, but takes much more time to do so, so it has to be used selectively. That's why V8 must try to predict which functions will benefit most from optimization, and carefully decide when to optimize them.<br /> <br /> In the past, V8 stopped once every millisecond to look at currently running functions, and eventually optimized them. For long-running programs, this worked great, but short-running programs often finished before they could benefit much from the optimizing compiler -- a single millisecond can be a long time to wait before optimizing! In addition, V8 often made different optimization decisions each time a JavaScript program ran, sometimes overlooking small but performance-critical functions.<br /> <br /> The new version of V8 makes earlier and more repeatable optimization decisions by analyzing the running program in more detail. It uses counters to keep track of how often JavaScript functions are called and loops are executed in a program, approximating the time spent inside each function. That way V8 is able to quickly gather fine-grained information about performance bottlenecks in a JavaScript program, and to make sure that the optimizing compiler's efforts are spent on those functions that deserve it most.<br /> <br /> The new algorithm is contained in the current beta channel releases -- go <a href="https://www.google.com/landing/chrome/beta/">give it a spin</a> now!<br /> <br /> <span class="post-author">Posted by Jakob Kummerow, Software Engineer</span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Chromium Blog:Better code optimization decisions for V8&url=https://blog.chromium.org/2012/05/better-code-optimization-decisions-for.html&via=ChromiumDev'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> </span> <span class='fb-custom social-wrapper' data-href='https://www.facebook.com/sharer.php?u=https://blog.chromium.org/2012/05/better-code-optimization-decisions-for.html'> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </span> </div> <div class='post-footer'> <div class='cmt_iframe_holder' data-href='https://blog.chromium.org/2012/05/better-code-optimization-decisions-for.html' data-viewtype='FILTERED_POSTMOD'></div> <a href='https://plus.google.com/112374322230920073195' rel='author' style='display:none;'> Google </a> <div class='label-footer'> <span class='labels-caption'> Labels: </span> <span class='labels'> <a class='label' href='https://blog.chromium.org/search/label/v8' rel='tag'> v8 </a> </span> </div> </div> </div> <div class='post' data-id='5989889625971218441' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://blog.chromium.org/2012/03/v8-benchmark-suite-extended-with.html' itemprop='url' title='V8 Benchmark Suite extended with physics simulation'> V8 Benchmark Suite extended with physics simulation </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Thursday, March 15, 2012 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> Today we are releasing version 7 of the <a href="http://v8.googlecode.com/svn/data/benchmarks/current/run.html">V8 Benchmark Suite</a>. This new version adds <a href="http://nerget.com/fluidSim/">Oliver Hunt’s</a> 2D <a href="http://en.wikipedia.org/wiki/Navier%E2%80%93Stokes_equations">Navier-Stokes</a> fluid dynamic simulation, which stresses intense double array computations. These complex double array computations are today common in games, graphic and scientific applications.<br /> <br /> The new test shows the recent improvements V8 has made in handling advanced physics computations: the current <a href="https://www.google.com/landing/chrome/beta/">Chrome 18</a> (today in beta) delivers a 5% score improvement compared to the current Chrome 17. <a href="http://tools.google.com/dlpage/chromesxs">Chrome 19</a> (today in canary), where the full set of improvements is being released, delivers a whopping 25% score improvement compared to Chrome 17.<br /> <br /> <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLSLPU3VnuJMcVk1nmdh2Rqr3ew4sZ2-xgcf3nXkKO5hl4fcVpPiX2LvdoUxz_O9vgKnGpFys1k789HKPvi9F1O_VBzd9XWQ_u_iYcPLzKGC0nbjz9BlBXWOGLRwr3uoHhtcD2jcebj2E/s1600/Screen+shot+2012-03-15+at+11.50.13+AM.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="205" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLSLPU3VnuJMcVk1nmdh2Rqr3ew4sZ2-xgcf3nXkKO5hl4fcVpPiX2LvdoUxz_O9vgKnGpFys1k789HKPvi9F1O_VBzd9XWQ_u_iYcPLzKGC0nbjz9BlBXWOGLRwr3uoHhtcD2jcebj2E/s320/Screen+shot+2012-03-15+at+11.50.13+AM.png" width="320" /></a><br /> <br /> With these additions, the V8 Benchmark Suite is now a more comprehensive collection of eight tests, including OS kernel simulation, crypto and string operations, memory management stress-tests, and as of today, double array computations.<br /> <br /> We plan to keep updating the suite by adding more tests. These updates are a reflection of Chrome’s commitment to keep pushing the boundaries of speed, optimizing the engine for today’s more demanding web apps.<br /> <br /> <span class="post-author">Posted by Stefano Cazzulani, Product Manager</span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> Today we are releasing version 7 of the <a href="http://v8.googlecode.com/svn/data/benchmarks/current/run.html">V8 Benchmark Suite</a>. This new version adds <a href="http://nerget.com/fluidSim/">Oliver Hunt’s</a> 2D <a href="http://en.wikipedia.org/wiki/Navier%E2%80%93Stokes_equations">Navier-Stokes</a> fluid dynamic simulation, which stresses intense double array computations. These complex double array computations are today common in games, graphic and scientific applications.<br /> <br /> The new test shows the recent improvements V8 has made in handling advanced physics computations: the current <a href="https://www.google.com/landing/chrome/beta/">Chrome 18</a> (today in beta) delivers a 5% score improvement compared to the current Chrome 17. <a href="http://tools.google.com/dlpage/chromesxs">Chrome 19</a> (today in canary), where the full set of improvements is being released, delivers a whopping 25% score improvement compared to Chrome 17.<br /> <br /> <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLSLPU3VnuJMcVk1nmdh2Rqr3ew4sZ2-xgcf3nXkKO5hl4fcVpPiX2LvdoUxz_O9vgKnGpFys1k789HKPvi9F1O_VBzd9XWQ_u_iYcPLzKGC0nbjz9BlBXWOGLRwr3uoHhtcD2jcebj2E/s1600/Screen+shot+2012-03-15+at+11.50.13+AM.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="205" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLSLPU3VnuJMcVk1nmdh2Rqr3ew4sZ2-xgcf3nXkKO5hl4fcVpPiX2LvdoUxz_O9vgKnGpFys1k789HKPvi9F1O_VBzd9XWQ_u_iYcPLzKGC0nbjz9BlBXWOGLRwr3uoHhtcD2jcebj2E/s320/Screen+shot+2012-03-15+at+11.50.13+AM.png" width="320" /></a><br /> <br /> With these additions, the V8 Benchmark Suite is now a more comprehensive collection of eight tests, including OS kernel simulation, crypto and string operations, memory management stress-tests, and as of today, double array computations.<br /> <br /> We plan to keep updating the suite by adding more tests. These updates are a reflection of Chrome’s commitment to keep pushing the boundaries of speed, optimizing the engine for today’s more demanding web apps.<br /> <br /> <span class="post-author">Posted by Stefano Cazzulani, Product Manager</span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Chromium Blog:V8 Benchmark Suite extended with physics simulation&url=https://blog.chromium.org/2012/03/v8-benchmark-suite-extended-with.html&via=ChromiumDev'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> </span> <span class='fb-custom social-wrapper' data-href='https://www.facebook.com/sharer.php?u=https://blog.chromium.org/2012/03/v8-benchmark-suite-extended-with.html'> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </span> </div> <div class='post-footer'> <div class='cmt_iframe_holder' data-href='https://blog.chromium.org/2012/03/v8-benchmark-suite-extended-with.html' data-viewtype='FILTERED_POSTMOD'></div> <a href='https://plus.google.com/112374322230920073195' rel='author' style='display:none;'> Google </a> <div class='label-footer'> <span class='labels-caption'> Labels: </span> <span class='labels'> <a class='label' href='https://blog.chromium.org/search/label/v8' rel='tag'> v8 </a> </span> </div> </div> </div> <div class='post' data-id='1329498309316059437' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://blog.chromium.org/2011/11/game-changer-for-interactive.html' itemprop='url' title='A game changer for interactive performance.'> A game changer for interactive performance. </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Monday, November 21, 2011 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> Today we are announcing the release of Chrome’s new <a href="http://en.wikipedia.org/wiki/Garbage_collection_(computer_science)#Stop-the-world_vs._incremental_vs._concurrent">incremental garbage collector</a> (GC) which dramatically improves interactive performance of web apps and HTML5 games.<br /><br />The V8 project has made <a href="http://blog.chromium.org/2010/12/new-crankshaft-for-v8.html">huge progress</a> improving <span style="font-style:italic;">peak performance</span> of web apps. With the advent of technologies like <a href="http://blog.chromium.org/2010/12/webgl-now-in-beta-here-comes-3d-web.html">WebGL</a> we’re seeing the emergence of highly interactive and graphically intensive apps, such as the <a href="http://blog.chromium.org/2011/10/heading-in-right-direction-with-webgl.html">new version of Google Maps</a>, <a href="https://chrome.google.com/webstore/detail/aknpkdffaafgjchaibgeefbgmgeghloj">new games</a> and <a href="http://www.chromeexperiments.com/webgl">demos</a>. But with these new uses comes a need for better <span style="font-style:italic;">interactive performance</span> in JavaScript.<br /><br />Avoiding pauses is vital to achieving good interactive performance. Previously, garbage collection pause times depended on the amount of memory used. Therefore, large interactive apps were impacted by pauses that caused hiccuping. V8’s new GC reduces pause times dramatically while maintaining great peak performance and memory use.<br /><br />To evaluate the new GC, we took the most memory intensive peak performance test from the V8 Benchmark Suite and used it to make a <a href="//goo.gl/QWugU">stress test</a> for interactive performance. In our testing the maximum time to render a frame including pause time is reduced from 272ms to 50ms.<br /><br />The new GC in Chrome improves interactive performance and opens up new possibilities for the interactive web. If you are developing highly interactive web apps or games, please try it out and share your experiences. It is available now on the <a href="http://dev.chromium.org/getting-involved/dev-channel">dev channel</a>.<br /><br /><span class='post-author'>Posted by Vyacheslav Egorov and Erik Corry, Software Engineers </span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> Today we are announcing the release of Chrome’s new <a href="http://en.wikipedia.org/wiki/Garbage_collection_(computer_science)#Stop-the-world_vs._incremental_vs._concurrent">incremental garbage collector</a> (GC) which dramatically improves interactive performance of web apps and HTML5 games.<br /><br />The V8 project has made <a href="http://blog.chromium.org/2010/12/new-crankshaft-for-v8.html">huge progress</a> improving <span style="font-style:italic;">peak performance</span> of web apps. With the advent of technologies like <a href="http://blog.chromium.org/2010/12/webgl-now-in-beta-here-comes-3d-web.html">WebGL</a> we’re seeing the emergence of highly interactive and graphically intensive apps, such as the <a href="http://blog.chromium.org/2011/10/heading-in-right-direction-with-webgl.html">new version of Google Maps</a>, <a href="https://chrome.google.com/webstore/detail/aknpkdffaafgjchaibgeefbgmgeghloj">new games</a> and <a href="http://www.chromeexperiments.com/webgl">demos</a>. But with these new uses comes a need for better <span style="font-style:italic;">interactive performance</span> in JavaScript.<br /><br />Avoiding pauses is vital to achieving good interactive performance. Previously, garbage collection pause times depended on the amount of memory used. Therefore, large interactive apps were impacted by pauses that caused hiccuping. V8’s new GC reduces pause times dramatically while maintaining great peak performance and memory use.<br /><br />To evaluate the new GC, we took the most memory intensive peak performance test from the V8 Benchmark Suite and used it to make a <a href="//goo.gl/QWugU">stress test</a> for interactive performance. In our testing the maximum time to render a frame including pause time is reduced from 272ms to 50ms.<br /><br />The new GC in Chrome improves interactive performance and opens up new possibilities for the interactive web. If you are developing highly interactive web apps or games, please try it out and share your experiences. It is available now on the <a href="http://dev.chromium.org/getting-involved/dev-channel">dev channel</a>.<br /><br /><span class='post-author'>Posted by Vyacheslav Egorov and Erik Corry, Software Engineers </span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Chromium Blog:A game changer for interactive performance.&url=https://blog.chromium.org/2011/11/game-changer-for-interactive.html&via=ChromiumDev'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> </span> <span class='fb-custom social-wrapper' data-href='https://www.facebook.com/sharer.php?u=https://blog.chromium.org/2011/11/game-changer-for-interactive.html'> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </span> </div> <div class='post-footer'> <div class='cmt_iframe_holder' data-href='https://blog.chromium.org/2011/11/game-changer-for-interactive.html' data-viewtype='FILTERED_POSTMOD'></div> <a href='https://plus.google.com/112374322230920073195' rel='author' style='display:none;'> Google </a> <div class='label-footer'> <span class='labels-caption'> Labels: </span> <span class='labels'> <a class='label' href='https://blog.chromium.org/search/label/v8' rel='tag'> v8 </a> </span> </div> </div> </div> <div class='post' data-id='6206214947087708049' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://blog.chromium.org/2011/05/updating-javascript-benchmarks-for.html' itemprop='url' title='Updating JavaScript Benchmarks for Modern Browsers'> Updating JavaScript Benchmarks for Modern Browsers </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Wednesday, May 4, 2011 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> Benchmarks are incredibly important for influencing the direction of JavaScript engines. Over the past two years, JavaScript has gotten dramatically faster across all major browsers, particularly in areas that popular benchmarks measure. As it turns out, browser developers are a competitive bunch. However, as JS engines get faster, benchmarks must evolve in order to keep pushing them in the right direction.<br /><br />We’ve been constantly updating our <a href="http://v8.googlecode.com/svn/data/benchmarks/v6/run.html">V8 benchmark suite</a> to force us to get faster in areas that are important to web developers. We’ve fixed bugs and added new tests for <a href="http://blog.chromium.org/2009/02/irregexp-google-chromes-new-regexp.html">regular expressions</a> and <a href="http://blog.chromium.org/2009/05/scaling-javascript-to-large-web.html">memory management</a>. We’re very focused on JavaScript performance, so we scrutinize our benchmark carefully to make sure that it’s as useful a measuring stick as possible.<br /><br />The two other widely cited JS benchmarks are <a href="http://www.webkit.org/perf/sunspider/sunspider.html">SunSpider</a> from Apple, and <a href="http://krakenbenchmark.mozilla.org/">Kraken</a>, a new benchmark from Mozilla. <br /><br />SunSpider was one of the first suites of tests, first appearing in 2007. It’s done a lot to help improve JS engines, but many of the tests in the suite are less relevant to the web in 2011. Even for the more relevant tests, JavaScript has gotten so fast that many finish in only a few milliseconds. This just isn’t long enough to figure out which engine is faster--a golf cart and a Tesla will finish a 10-foot race in nearly the same time. <br /><br />To make the benchmark more meaningful, we’ve experimented by making the race longer by running each of the tests in SunSpider 50 times consecutively. While repeating a trivial test many times isn’t a great solution, it does provide an opportunity for some optimization. With this change, the results begin to reflect Chrome’s true performance. It’s more than 30% faster on the SunSpider suite overall and up to 4x faster on some of the individual tests.<br /><br />Kraken, a more modern benchmark, is in better shape. Unfortunately, the <a href="http://krakenbenchmark.mozilla.org/">canonical</a> version of the benchmark has not been updated to reflect all the latest changes which address at least <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=599914">one important bug</a>. As a result, the benchmark is less useful and has even (mis)led us to spend time making some <a href="http://codereview.chromium.org/6670115/">irrelevant optimizations</a> in Chrome. To help us focus on the right things, we’re now testing the latest version of Kraken built directly from Mozilla’s source code repository.<br /><br />We’re posting a <a href="http://sunspider-mod.googlecode.com/svn/data/hosted/sunspider.html">modified version of SunSpider</a> and the <a href="http://kraken-mirror.googlecode.com/svn/trunk/kraken/hosted/index.html">latest version of Kraken</a> to make it easy to run the benchmarks in your own browser and compare results.<br /><br /><span class='post-author'>Posted by Mike Belshe, Software Engineer </span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> Benchmarks are incredibly important for influencing the direction of JavaScript engines. Over the past two years, JavaScript has gotten dramatically faster across all major browsers, particularly in areas that popular benchmarks measure. As it turns out, browser developers are a competitive bunch. However, as JS engines get faster, benchmarks must evolve in order to keep pushing them in the right direction.<br /><br />We’ve been constantly updating our <a href="http://v8.googlecode.com/svn/data/benchmarks/v6/run.html">V8 benchmark suite</a> to force us to get faster in areas that are important to web developers. We’ve fixed bugs and added new tests for <a href="http://blog.chromium.org/2009/02/irregexp-google-chromes-new-regexp.html">regular expressions</a> and <a href="http://blog.chromium.org/2009/05/scaling-javascript-to-large-web.html">memory management</a>. We’re very focused on JavaScript performance, so we scrutinize our benchmark carefully to make sure that it’s as useful a measuring stick as possible.<br /><br />The two other widely cited JS benchmarks are <a href="http://www.webkit.org/perf/sunspider/sunspider.html">SunSpider</a> from Apple, and <a href="http://krakenbenchmark.mozilla.org/">Kraken</a>, a new benchmark from Mozilla. <br /><br />SunSpider was one of the first suites of tests, first appearing in 2007. It’s done a lot to help improve JS engines, but many of the tests in the suite are less relevant to the web in 2011. Even for the more relevant tests, JavaScript has gotten so fast that many finish in only a few milliseconds. This just isn’t long enough to figure out which engine is faster--a golf cart and a Tesla will finish a 10-foot race in nearly the same time. <br /><br />To make the benchmark more meaningful, we’ve experimented by making the race longer by running each of the tests in SunSpider 50 times consecutively. While repeating a trivial test many times isn’t a great solution, it does provide an opportunity for some optimization. With this change, the results begin to reflect Chrome’s true performance. It’s more than 30% faster on the SunSpider suite overall and up to 4x faster on some of the individual tests.<br /><br />Kraken, a more modern benchmark, is in better shape. Unfortunately, the <a href="http://krakenbenchmark.mozilla.org/">canonical</a> version of the benchmark has not been updated to reflect all the latest changes which address at least <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=599914">one important bug</a>. As a result, the benchmark is less useful and has even (mis)led us to spend time making some <a href="http://codereview.chromium.org/6670115/">irrelevant optimizations</a> in Chrome. To help us focus on the right things, we’re now testing the latest version of Kraken built directly from Mozilla’s source code repository.<br /><br />We’re posting a <a href="http://sunspider-mod.googlecode.com/svn/data/hosted/sunspider.html">modified version of SunSpider</a> and the <a href="http://kraken-mirror.googlecode.com/svn/trunk/kraken/hosted/index.html">latest version of Kraken</a> to make it easy to run the benchmarks in your own browser and compare results.<br /><br /><span class='post-author'>Posted by Mike Belshe, Software Engineer </span> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Chromium Blog:Updating JavaScript Benchmarks for Modern Browsers&url=https://blog.chromium.org/2011/05/updating-javascript-benchmarks-for.html&via=ChromiumDev'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> </span> <span class='fb-custom social-wrapper' data-href='https://www.facebook.com/sharer.php?u=https://blog.chromium.org/2011/05/updating-javascript-benchmarks-for.html'> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </span> </div> <div class='post-footer'> <div class='cmt_iframe_holder' data-href='https://blog.chromium.org/2011/05/updating-javascript-benchmarks-for.html' data-viewtype='FILTERED_POSTMOD'></div> <a href='https://plus.google.com/112374322230920073195' rel='author' style='display:none;'> Google </a> <div class='label-footer'> <span class='labels-caption'> Labels: </span> <span class='labels'> <a class='label' 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</li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/coalition%20for%20better%20ads'> coalition for better ads </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/contact%20picker'> contact picker </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/content%20indexing'> content indexing </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/cookies'> cookies </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/core%20web%20vitals'> core web vitals </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/csrf'> csrf </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/css'> css </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/cumulative%20layout%20shift'> cumulative layout shift </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/custom%20tabs'> custom tabs </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/dart'> dart </a> <span dir='ltr'> 8 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/dashboard'> dashboard </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/Data%20Saver'> Data Saver </a> <span dir='ltr'> 3 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/Data%20saver%20desktop%20extension'> Data saver desktop extension </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/day%202'> day 2 </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/deceptive%20installation'> deceptive installation </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/declarative%20net%20request%20api'> declarative net request api </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/design'> design </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/developer%20dashboard'> developer dashboard </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/Developer%20Program%20Policy'> Developer Program Policy </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/developer%20website'> developer website </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/devtools'> devtools </a> <span dir='ltr'> 13 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/digital%20event'> digital event </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/discoverability'> discoverability </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/DNS-over-HTTPS'> DNS-over-HTTPS </a> <span dir='ltr'> 4 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/DoH'> DoH </a> <span dir='ltr'> 4 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/emoji'> emoji </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/emscriptem'> emscriptem </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/enterprise'> enterprise </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/extensions'> extensions </a> <span dir='ltr'> 27 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/Fast%20badging'> Fast badging </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/faster%20web'> faster web </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/features'> features </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/feedback'> feedback </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/field%20data'> field data </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/first%20input%20delay'> first input delay </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/Follow'> Follow </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/fonts'> fonts </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/form%20controls'> form controls </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/frameworks'> frameworks </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/fugu'> fugu </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/fund'> fund </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/funding'> funding </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/gdd'> gdd </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/google%20earth'> google earth </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/google%20event'> google event </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/google%20io%202019'> google io 2019 </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/google%20web%20developer'> google web developer </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/googlechrome'> googlechrome </a> <span dir='ltr'> 12 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/harmful%20ads'> harmful ads </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/html5'> html5 </a> <span dir='ltr'> 11 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/HTTP%2F3'> HTTP/3 </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/HTTPS'> HTTPS </a> <span dir='ltr'> 4 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/iframes'> iframes </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/images'> images </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/incognito'> incognito </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/insecure%20forms'> insecure forms </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/intent%20to%20explain'> intent to explain </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/ios'> ios </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/ios%20Chrome'> ios Chrome </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/issue%20tracker'> issue tracker </a> <span dir='ltr'> 3 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/jank'> jank </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/javascript'> javascript </a> <span dir='ltr'> 5 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/lab%20data'> lab data </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/labelling'> labelling </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/largest%20contentful%20paint'> largest contentful paint </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/launch'> launch </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/lazy-loading'> lazy-loading </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/lighthouse'> lighthouse </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/linux'> linux </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/Lite%20Mode'> Lite Mode </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/Lite%20pages'> Lite pages </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/loading%20interventions'> loading interventions </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/loading%20optimizations'> loading optimizations </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/lock%20icon'> lock icon </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/long-tail'> long-tail </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/mac'> mac </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/manifest%20v3'> manifest v3 </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/metrics'> metrics </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/microsoft%20edge'> microsoft edge </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/mixed%20forms'> mixed forms </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/mobile'> mobile </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/na'> na </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/native%20client'> native client </a> <span dir='ltr'> 8 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/native%20file%20system'> native file system </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/New%20Features'> New Features </a> <span dir='ltr'> 5 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/notifications'> notifications </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/octane'> octane </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/open%20web'> open web </a> <span dir='ltr'> 4 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/origin%20trials'> origin trials </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/pagespeed%20insights'> pagespeed insights </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/pagespeedinsights'> pagespeedinsights </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/passwords'> passwords </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/payment%20handler'> payment handler </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/payment%20request'> payment request </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/payments'> payments </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/performance'> performance </a> <span dir='ltr'> 20 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/performance%20tools'> performance tools </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/permission%20UI'> permission UI </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/permissions'> permissions </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/play%20store'> play store </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/portals'> portals </a> <span dir='ltr'> 3 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/prefetching'> prefetching </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/privacy'> privacy </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/privacy%20sandbox'> privacy sandbox </a> <span dir='ltr'> 4 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/private%20prefetch%20proxy'> private prefetch proxy </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/profile%20guided%20optimization'> profile guided optimization </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/progressive%20web%20apps'> progressive web apps </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/Project%20Strobe'> Project Strobe </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/protection'> protection </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/pwa'> pwa </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/QUIC'> QUIC </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/quieter%20permissions'> quieter permissions </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/releases'> releases </a> <span dir='ltr'> 3 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/removals'> removals </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/rlz'> rlz </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/root%20program'> root program </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/safe%20browsing'> safe browsing </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/Secure%20DNS'> Secure DNS </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/security'> security </a> <span dir='ltr'> 36 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/site%20isolation'> site isolation </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/slow%20loading'> slow loading </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/sms%20receiver'> sms receiver </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/spam%20policy'> spam policy </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/spdy'> spdy </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/spectre'> spectre </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/speed'> speed </a> <span dir='ltr'> 4 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/ssl'> ssl </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/store%20listing'> store listing </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/strobe'> strobe </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/subscription%20pages'> subscription pages </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/suspicious%20site%20reporter%20extension'> suspicious site reporter extension </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/TCP'> TCP </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/the%20fast%20and%20the%20curious'> the fast and the curious </a> <span dir='ltr'> 23 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/TLS'> TLS </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/tools'> tools </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/tracing'> tracing </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/transparency'> transparency </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/trusted%20web%20activities'> trusted web activities </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/twa'> twa </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/user%20agent%20string'> user agent string </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/user%20data%20policy'> user data policy </a> <span dir='ltr'> 1 </span> </li> <li> <span dir='ltr'> v8 </span> <span dir='ltr'> 6 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/video'> video </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/wasm'> wasm </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/web'> web </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/web%20apps'> web apps </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/web%20assembly'> web assembly </a> <span dir='ltr'> 2 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/web%20developers'> web developers </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/web%20intents'> web intents </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/web%20packaging'> web packaging </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/web%20payments'> web payments </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/web%20platform'> web platform </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/web%20request%20api'> web request api </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/web%20vitals'> web vitals </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/web.dev'> web.dev </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/web.dev%20live'> web.dev live </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/webapi'> webapi </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/webassembly'> webassembly </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/webaudio'> webaudio </a> <span dir='ltr'> 3 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/webgl'> webgl </a> <span dir='ltr'> 7 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/webkit'> webkit </a> <span dir='ltr'> 5 </span> 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href='https://blog.chromium.org/2018/08/'> Aug </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2018/07/'> Jul </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2018/06/'> Jun </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2018/05/'> May </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2018/04/'> Apr </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2018/03/'> Mar </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2018/02/'> Feb </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2018/01/'> Jan </a> </div> <div class='items'> </div> </li> </ul> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class='intervalToggle'> <span class='new-toggle' href='javascript:void(0)'> <i class='material-icons arrow'>  </i> </span> <a class='toggle' href='javascript:void(0)' style='display: none'> <span class='zippy'> <i class='material-icons'>  </i>   </span> </a> <a class='post-count-link' href='https://blog.chromium.org/2017/'> 2017 </a> </div> <div class='items'> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2017/12/'> Dec </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2017/11/'> Nov </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2017/10/'> Oct </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2017/09/'> Sep </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2017/08/'> Aug </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2017/07/'> Jul </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2017/06/'> Jun </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2017/05/'> May </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2017/04/'> Apr </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2017/03/'> Mar </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2017/02/'> Feb </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2017/01/'> Jan </a> </div> <div class='items'> </div> </li> </ul> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class='intervalToggle'> <span class='new-toggle' href='javascript:void(0)'> <i class='material-icons arrow'>  </i> </span> <a class='toggle' href='javascript:void(0)' style='display: none'> <span class='zippy'> <i class='material-icons'>  </i>   </span> </a> <a class='post-count-link' href='https://blog.chromium.org/2016/'> 2016 </a> </div> <div class='items'> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2016/12/'> Dec </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li 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class='post-count-link' href='https://blog.chromium.org/2013/'> 2013 </a> </div> <div class='items'> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2013/12/'> Dec </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2013/11/'> Nov </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2013/10/'> Oct </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2013/09/'> Sep </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2013/08/'> Aug </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2013/07/'> Jul </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2013/06/'> Jun </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2013/05/'> May </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2013/04/'> Apr </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2013/03/'> Mar </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2013/02/'> Feb </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2013/01/'> Jan </a> </div> <div class='items'> </div> </li> </ul> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class='intervalToggle'> <span class='new-toggle' href='javascript:void(0)'> <i class='material-icons arrow'>  </i> </span> <a class='toggle' href='javascript:void(0)' style='display: none'> <span class='zippy'> <i class='material-icons'>  </i>   </span> </a> <a class='post-count-link' href='https://blog.chromium.org/2012/'> 2012 </a> </div> <div class='items'> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2012/12/'> Dec </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2012/11/'> Nov </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2012/10/'> Oct </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2012/09/'> Sep </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2012/08/'> Aug </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2012/07/'> Jul </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2012/06/'> Jun </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2012/05/'> May </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2012/04/'> Apr </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2012/03/'> Mar </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2012/02/'> Feb </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2012/01/'> Jan </a> </div> <div class='items'> </div> </li> </ul> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class='intervalToggle'> <span class='new-toggle' href='javascript:void(0)'> <i class='material-icons arrow'>  </i> </span> <a class='toggle' href='javascript:void(0)' style='display: none'> <span class='zippy'> <i class='material-icons'>  </i>   </span> </a> <a class='post-count-link' href='https://blog.chromium.org/2011/'> 2011 </a> </div> <div class='items'> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2011/12/'> Dec </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li 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class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2011/06/'> Jun </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2011/05/'> May </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2011/04/'> Apr </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2011/03/'> Mar </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2011/02/'> Feb </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2011/01/'> Jan </a> </div> <div class='items'> </div> </li> </ul> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class='intervalToggle'> <span class='new-toggle' href='javascript:void(0)'> <i class='material-icons arrow'>  </i> </span> <a class='toggle' href='javascript:void(0)' style='display: none'> <span class='zippy'> <i class='material-icons'>  </i>   </span> </a> <a class='post-count-link' href='https://blog.chromium.org/2010/'> 2010 </a> </div> <div class='items'> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2010/12/'> Dec </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2010/11/'> Nov </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2010/10/'> Oct </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2010/09/'> Sep </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2010/08/'> Aug </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2010/07/'> Jul </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2010/06/'> Jun </a> </div> <div class='items'> </div> 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style='margin-top: -16px;' width='92'/> </a> <ul> <li> <a href='//www.google.com/'> Google </a> </li> <li> <a href='//www.google.com/policies/privacy/'> Privacy </a> </li> <li> <a href='//www.google.com/policies/terms/'> Terms </a> </li> </ul> </div> </div> <script type='text/javascript'> //<![CDATA[ // Social sharing popups. var postEl = document.getElementsByClassName('social-wrapper'); var postCount = postEl.length; for(i=0; i<postCount;i++){ postEl[i].addEventListener("click", function(event){ var postUrl = this.getAttribute("data-href"); window.open( postUrl,'popUpWindow','height=500,width=500,left=10,top=10,resizable=yes,scrollbars=yes,toolbar=yes,menubar=no,location=no,directories=no,status=yes'); });} //]]> </script> <script type='text/javascript'> //<![CDATA[ var BreakpointHandler = function() { this.initted = false; this.isHomePage = false; this.isMobile = false; }; BreakpointHandler.prototype.finalizeSummary = function(summaryHtml, lastNode) { // Use $.trim for IE8 compatibility summaryHtml = $.trim(summaryHtml).replace(/(<br>|\s)+$/,''); if (lastNode.nodeType == 3) { var lastChar = summaryHtml.slice(-1); if (!lastChar.match(/[.”"?]/)) { if (!lastChar.match(/[A-Za-z]/)) { summaryHtml = summaryHtml.slice(0, -1); } summaryHtml += ' ...'; } } else if (lastNode.nodeType == 1 && (lastNode.nodeName == 'I' || lastNode.nodeName == 'A')) { summaryHtml += ' ...'; } return summaryHtml; }; BreakpointHandler.prototype.generateSummaryFromContent = function(content, numWords) { var seenWords = 0; var summaryHtml = ''; for (var i=0; i < content.childNodes.length; i++) { var node = content.childNodes[i]; var nodeText; if (node.nodeType == 1) { if (node.hasAttribute('data-about-pullquote')) { continue; } nodeText = node.textContent; if (nodeText === undefined) { // innerText for IE8 nodeText = node.innerText; } if (node.nodeName == 'DIV' || node.nodeName == 'B') { // Don't end early if we haven't seen enough words. if (seenWords < 10) { continue; } if (i > 0) { summaryHtml = this.finalizeSummary(summaryHtml, content.childNodes[i-1]); } break; } summaryHtml += node.outerHTML; } else if (node.nodeType == 3) { nodeText = node.nodeValue; summaryHtml += nodeText + ' '; } var words = nodeText.match(/\S+\s*/g); if (!words) { continue; } var remain = numWords - seenWords; if (words.length >= remain) { summaryHtml = this.finalizeSummary(summaryHtml, node); break; } seenWords += words.length; } return summaryHtml; }; BreakpointHandler.prototype.detect = function() { var match, pl = /\+/g, search = /([^&=]+)=?([^&]*)/g, decode = function (s) { return decodeURIComponent(s.replace(pl, " ")); }, query = window.location.search.substring(1); var urlParams = {}; while (match = search.exec(query)) urlParams[decode(match[1])] = decode(match[2]); this.isListPage = $('html').hasClass('list-page'); this.isMobile = urlParams['m'] === '1'; this.isHomePage = window.location.pathname == '/'; }; BreakpointHandler.prototype.initContent = function() { var self = this; $('.post').each(function(index) { var body = $(this).children('.post-body')[0]; var content = $(body).children('.post-content')[0]; $(content).addClass('post-original'); var data = $(content).children('script').html(); data = self.rewriteForSSL(data); // If exists, extract specified editor's preview. var match = data.match(/([\s\S]+?)<div data-is-preview.+?>([\s\S]+)<\/div>/m); if (match) { data = match[1]; } // Prevent big images from loading when they aren't needed. // This must be done as a pre-injection step, since image loading can't be // canceled once embedded into the DOM. if (self.isListPage && self.isMobile) { data = data.replace(/<(img|iframe) .+?>/g, ''); } // Insert template to be rendered as nodes. content.innerHTML = data; if (self.isListPage) { var summary = document.createElement('div'); $(summary).addClass('post-content'); $(summary).addClass('post-summary'); body.insertBefore(summary, content); if (match) { // Use provided summary. summary.innerHTML = match[2]; } else { // Generate a summary. // Summary generation relies on DOM, so it must occur after content is // inserted into the page. summary.innerHTML = self.generateSummaryFromContent(content, 30); } // Add read more link to summary. var titleAnchor = $(this).find('.title a')[0]; var link = titleAnchor.cloneNode(true); link.innerHTML = 'Read More'; $(link).addClass('read-more'); summary.appendChild(link); } }); // Firefox does not allow for proper styling of BR. if (navigator.userAgent.indexOf('Firefox') > -1) { $('.post-content br').replaceWith('<span class="space"></span>'); } $('.loading').removeClass('loading'); }; BreakpointHandler.prototype.process = function() { if (!this.initted) { var makeInsecureImageRegex = function(hosts) { var whitelist = hosts.join('|').replace(/\./g,'\\.'); // Normal image tags, plus input images (yes, this is possible!) return new RegExp('(<(img|input)[^>]+?src=("|\'))http:\/\/(' + whitelist +')', 'g'); }; this.sslImageRegex = 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