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-webkit-font-smoothing: antialiased; } body { padding: 0; /* This ensures that the scroll bar is always present, which is needed */ /* because content render happens after page load; otherwise the header */ /* would "bounce" in-between states. */ min-height: 150%; } h2 { font-size: 16px; } h1, h2, h3, h4, h5 { line-height: 2em; } html, h4, h5, h6 { font-size: 14px; } a, a:visited { /* Ensures links meet minimum contrast ratios. */ color: #3974d6; text-decoration: none; } a:focus, a:hover, a:active { text-decoration: none; } .Header { margin-top: 15px; } .Header h1 { font-size: 32px; font-weight: 300; line-height: 32px; height: 42px; } .header-inner .Header .titlewrapper { padding: 0; margin-top: 30px; } .header-inner .Header .descriptionwrapper { padding: 0; margin: 0; } .cols-wrapper { margin-top: 56px; } .header-outer, .cols-wrapper, .footer-outer, .google-footer-outer { padding: 0 60px; } .header-inner { height: 256px; position: relative; } html, .header-inner a { color: #212121; color: rgba(0,0,0,.87); 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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='6876489512346638549' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://blog.chromium.org/2021/04/digging-for-performance-gold.html' itemprop='url' title='Digging for performance gold: finding hidden performance wins'> Digging for performance gold: finding hidden performance wins </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Thursday, April 22, 2021 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> <i>We are fortunate that so many people choose Chrome as their browser to get things done, which is why we are continually investing in making Chrome more performant. But with software as complex as Chrome, there is a lot of performance left hidden in areas we aren’t actively working on. In our latest post in the <a href="https://blog.chromium.org/search/label/the%20fast%20and%20the%20curious">The Fast and the Curious</a> series, we investigate how to diagnose, find, and fix performance problems that normally go undetected.</i><br /><br /><br /><br /><h2 style="text-align: left;"><span style="font-size: x-large;">The 1%</span></h2>Our metrics show that while Chrome is fast on average, it can be noticeably slow at times. Such user-pain is visible in the 99th percentile of many of our metrics but unreproducible, and thus quite hard to act upon. Deeper analysis in the data shows that the long-tail of performance is not 1% of users on slow machines but rather many users, 1% of the time.<br /><br />Let’s talk about 1%. 1% is quite large in practice. The core metric we use is “jank” which is a noticeable delay between when the user gives input and when software reacts to it. Chrome measures jank every 30 seconds, so Jank in 1% of samples for a given user means jank once every 50 minutes. To that user, Chrome feels slow at those moments. Now the problem: can we find and fix the root causes of all the ways Chrome can be momentarily slow for our users?<br /><br /><div><br /></div><div><br /></div><div><h2 style="text-align: left;"><span style="font-size: x-large;">Approach</span></h2>As engineers, our training in optimization is to focus on improving the algorithmic performance of the components we own. The last 3 years of analyzing the immensely complex codebase of Chrome however have taught us that the real issue is often cross-cutting: multiple unrelated features’ long-tail performance issues, sharing the same systemic root cause(s). Applying local expertise and optimization is likely to miss the global optimum. It is necessary to disregard our initial intuition and assume ignorance, forcing us to dig beyond what is immediately apparent and find the underlying root cause by relentlessly exposing what we don’t know.</div><div><br /></div><div><br /></div><div><br /><h2 style="text-align: left;"><span style="font-size: x-large;">Chasing Invisible Bugs</span></h2>How do we find bugs that are unforeseen, unreproducible, unowned, and essentially invisible?<br /><br />First, define a scenario. For this work, we focus on user-visible Jank, which we <a href="https://chromium.googlesource.com/chromium/src/+/master/tools/metrics/histograms/README.md">measure in the field</a> as a way to systematically identify moments where Chrome feels slow.<br /><br />Second, gather high actionability bug reports in the field. For this we rely on Chrome’s <a href="https://source.chromium.org/search?q=BackgroundTracing&ss=chromium">BackgroundTracing</a> infrastructure to generate what we call Slow Reports. A subset of Canary users who have opted in to sharing anonymized metrics have circular-buffer tracing enabled to examine specific scenarios. If a preconfigured threshold on a metric of interest is hit, the trace buffer is captured, anonymized, and uploaded to Google servers.<br /><br />Such a bug report might look like this:</div><div><br /></div><div><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuamYfrtx4rDkQAW9KBorT5zdM8EkMamWGuPsnDU8VW7iJfMzm0j_NozS7ak7z1xQEMuIXFL_6LLMX7VsfkJFlEjwv_9C5Uhyphenhyphen6ywYquTNFb02c6NrXJegyZzka-pPVUJbLPFDoEprW8L6F/s1351/image1.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="190" data-original-width="1351" height="92" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuamYfrtx4rDkQAW9KBorT5zdM8EkMamWGuPsnDU8VW7iJfMzm0j_NozS7ak7z1xQEMuIXFL_6LLMX7VsfkJFlEjwv_9C5Uhyphenhyphen6ywYquTNFb02c6NrXJegyZzka-pPVUJbLPFDoEprW8L6F/w654-h92/image1.png" width="654" /></a></div><span style="font-size: xx-small;"><div style="text-align: center;">chrome://tracing view of a 2 seconds Jank on AutocompleteController::UpdateResult() on an otherwise healthy machine</div></span><br /><br />We have a culprit! Let’s optimize AutocompleteController? No! We don’t know why yet: keep assuming ignorance!<br /><br />By augmenting BackgroundTracing with stack sampling, we were able to find a recurring stack under stalled AutoComplete events:</div><div><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><br /></span></div><div><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><span>    </span>RegEnumValueW</span></div><div><span id="docs-internal-guid-4a961e85-7fff-418a-ea39-3b655b9b59f5"><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><span>    </span>RegEnumValueWStub</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><span>    </span>base::win::RegistryValueIterator::Read()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><span>    </span>gfx::`anonymous namespace\'::CachedFontLinkSettings::GetLinkedFonts</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::internal::LinkedFontsIterator::GetLinkedFonts()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::internal::LinkedFontsIterator::NextFont(gfx::Font *)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::GetFallbackFonts(gfx::Font const &)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::RenderTextHarfBuzz::ShapeRuns(...)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::RenderTextHarfBuzz::ItemizeAndShapeText(...)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::RenderTextHarfBuzz::EnsureLayoutRunList()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::RenderTextHarfBuzz::EnsureLayout()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::RenderTextHarfBuzz::GetStringSizeF()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::RenderTextHarfBuzz::GetStringSize()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxTextView::CalculatePreferredSize()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxTextView::ReapplyStyling()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxTextView::SetText...)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxResultView::Invalidate()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxResultView::SetMatch(AutocompleteMatch const &)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><span>    </span>OmniboxPopupContentsView::UpdatePopupAppearance()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxPopupModel::OnResultChanged()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxEditModel::OnCurrentMatchChanged()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxController::OnResultChanged(bool)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>AutocompleteController::UpdateResult(bool,bool)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>AutocompleteController::Start(AutocompleteInput const &)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>(...)</span></p><div><br /></div></span></div><div>Ah ha! Autocomplete is not at fault. Time to optimize GetFallbackFonts()?! But wait… Why is GetFallbackFonts() even called in the first place?<br /><br />And before we figure that out, how do we know this is the #1 root cause of our overall long-tail performance issue? We’ve only looked at one trace so far after all...</div><div><br /></div><div><br /></div><div><br /><h2 style="text-align: left;"><span style="font-size: x-large;">The Measurement Conundrum</span></h2>The metrics tell us how many users are affected and how bad it is, but they do not highlight the root cause.<br /><br />Slow Reports tell us what the problem is for a specific user but not how many users are affected. And while we can query our corpus of Slow Report traces, it comes with inherent biases that make it impossible to correlate 1:1 with metrics. For instance, because Chrome only reports the first instance of bad performance per-session and only for users of the Canary/Dev channel, there’s both a startup and a population bias.<br /><br />This is the measurement conundrum. The more actionability (data) a tool provides, the fewer scenarios it captures and the more bias it incurs. Depth vs. breadth.<br /><br />Tools that attempt to do both sit somewhere in the middle, where they use aggregation over a large dataset and risk showing aggregate results based on flawed input (e.g. circular buffer tracing having dropped the interesting portion and contributing to a biased aggregate).<br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJgG5FJ_GzIKmhTioVzKejDcx8y6ohL5lUoHr6LYV9k4LbdVmu4ZebMXleU1TSc2Ri8KQCAxzomAn1ZvHYsiQOB3yuJNNlZH_YZq4I1h4ITZO1Pn2DZIKqk08oTAAu_IGv__P6kPxyH9J_/s1140/image4.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="702" data-original-width="1140" height="334" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJgG5FJ_GzIKmhTioVzKejDcx8y6ohL5lUoHr6LYV9k4LbdVmu4ZebMXleU1TSc2Ri8KQCAxzomAn1ZvHYsiQOB3yuJNNlZH_YZq4I1h4ITZO1Pn2DZIKqk08oTAAu_IGv__P6kPxyH9J_/w542-h334/image4.png" width="542" /></a></div><div style="text-align: center;"><br /></div><br /><br />Thus we scientifically opted for the least engineering-minded option: open a bunch of Slow Report traces manually. This gave us the most actionability over a top-level issue we’d already quantified.<br /><br />After opening dozens of traces it turned out that a great majority showed variations of the aforementioned fonts issue. While this didn’t give us a precise #users-affected, it was enough for us to believe it was the main cause of user pain seen in the metrics.</div><div><br /></div><div><br /></div><div><br /></div><div><br /><h2 style="text-align: left;"><span style="font-size: x-large;">Fallback Fonts</span></h2>We dug into why GetFallbackFonts() had to be called in the first place. In the example above, the caller is trying to determine the size in pixels of a Unicode string rendered by a given font.<br /><br />If a substring within it is from a <a href="https://en.wikipedia.org/wiki/Unicode_block">Unicode Block</a> that can’t be rendered by the given font, GetFallbackFont() is used to request the system recommended fallback font for it. If that fails, GetFallbackFonts() is invoked to try all the <a href="https://docs.microsoft.com/en-us/globalization/input/font-technology">linked fonts</a> and determine the one that can best render it; that second fallback is much slower.<br /><br />GetFallbackFont() should never fail, but in practice it’s not that simple. The reliable way to do this on Windows is to query <a href="https://docs.microsoft.com/en-us/windows/win32/directwrite/introducing-directwrite">DirectWrite</a>; however, DirectWrite was added in Windows 7, when Chrome still supported Windows XP. Therefore the GetFallbackFont() logic was forced to stick to a less reliable <a href="https://chromium.googlesource.com/chromium/src/+/22aed04422b04b2cf04f7b7d61392da4e9a2c85a/ui/gfx/font_fallback_win.cc#303">heuristic using Uniscribe+GDI</a> in order to work on both versions of the OS. Since things worked most of the time, no one noticed that this could have been cleaned up when Chrome later dropped support for Windows XP. With new tooling to investigate long-tail performance, this turned out to be the number one cause of jank (unnecessarily invoking GetFallbackFonts()).<br /><br />We <a href="https://chromium-review.googlesource.com/c/chromium/src/+/1663504/">fixed</a> that, reducing the amount of calls to GetFallbackFonts() by 4x.</div><div><br /></div><div><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjoS0pmpqWu93gtMQh1cRD6OcC3F60XoaMDHxOjzg2DVQLrht0IPOwW-ump4C81YHswCaF_NiejtJZo8fCdZGmW3PgANB4m8R-Y9WVJDFjzbuyIB0FiRHYnMVK6bQlBg_K5tfrErbMHmhyb/s1244/image3.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="487" data-original-width="1244" height="258" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjoS0pmpqWu93gtMQh1cRD6OcC3F60XoaMDHxOjzg2DVQLrht0IPOwW-ump4C81YHswCaF_NiejtJZo8fCdZGmW3PgANB4m8R-Y9WVJDFjzbuyIB0FiRHYnMVK6bQlBg_K5tfrErbMHmhyb/w660-h258/image3.png" width="660" /></a></div><div style="text-align: center;"><br /></div><br /><br />Still not zero though, and still seeing instances of the aforementioned AutoComplete issue in our Slow Reports. Keep digging. DirectWrite’s GetFallbackFont() failing was unexpected, but since Slow Reports are anonymized, no user-generated strings can be uploaded -- and therefore, finding which codepoints were problematic was tricky. We teamed up with our privacy experts to instrument Unicode Block and Script of text blocks going through <a href="https://en.wikipedia.org/wiki/HarfBuzz">HarfBuzz</a> so that we could ensure no leakage of <a href="https://en.wikipedia.org/wiki/Personal_data">Personally Identifiable Information</a>.</div><div><br /></div><div><br /></div><div>  <br /><h2 style="text-align: left;"><span style="font-size: x-large;">The Emoji Saga</span></h2>With this new recording enabled, the next wave of Slow Reports came back. The vast majority of reports indicated that font fallback was failing when DirectWrite was being asked to find a font for a codepoint (Unicode character) in <a href="https://www.compart.com/en/unicode/block/U+1F300">Miscellaneous Symbols and Pictographs</a>. We wrote a local script trying all codepoints in that Unicode Block and quickly found out which ones could be problematic: U+1F3FB - U+1F3FF are modifiers added in Unicode 8.0 and are meaningful only when paired with another codepoint. For instance, U+1F9D7 (🧗) when paired with U+1F3FF is 🧗🏿. No font can render U+1F3FF on its own, and font fallback would correctly error out after scanning all linked fonts when asked to find one. The bug was in the browser-side Unicode <a href="https://unicode.org/reports/tr29/">segmentation</a> logic which incorrectly broke down these two <a href="https://en.wikipedia.org/wiki/Code_point">codepoints</a> and asked DirectWrite to render them separately instead of keeping them as a single grapheme.<br /><br />But wait, doesn’t Chrome support modern Unicode..?! Indeed, it does, in Blink which renders the web content. But the browser-side logic was not updated to support modern emojis (with modifiers) because it didn’t use to draw emojis at all. It’s only when the browser UI (tab strip, bookmark bar, omnibox, etc.) was modernized to support Unicode circa 2018 that the legacy segmentation logic became an (invisible) problem.<br /><br />On top of that, the caching logic did not cache on error, so trying to render a modifier on its own caused a massive jank, every time, for users with a lot of fonts installed. Ironically, this cache had been added to amortize the cost of this misunderstood bottleneck when Unicode support was first added to browser UI. Diving deeper into the underlying implementation of our fonts logic, rather than stopping at the layer of the fonts APIs, not only fixed a major performance issue but also resulted in a correctness fix for other <a href="https://emojipedia.org/emoji/">emojis</a>. For instance, 🏳️‍🌈 is encoded as U+1F3F3( 🏳️) + U+1F308 (🌈); before the itemization fix, browser UI would incorrectly render this grapheme as 🏳️🌈.<br /><br /><br /><br /><h2 style="text-align: left;"><span style="font-size: x-large;">And the journey continues...</span></h2>Our journey keeps going into various components of Chrome but it always follows the same basic playbook: assume ignorance and relentlessly investigate unforeseen, unreproducible, and unowned bugs. And while stack ranking issues is nigh impossible (see: measurement conundrum), fixing the top 5 findings from any given tool and zooming in on the long tail has always addressed the majority of the user pain in practice.<br /><br />Using this approach, we have reduced user-visible jank by a factor of 10X over the last 2.5 years and improved long-tail performance of many features caught in the cross-fire. <br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijclE3wC3-F5EWITLOOC4zFxE49mBpRu35jBlA0_nW9f4vl7RrEfg3FFMCTVqPYVnkOlR1cBxGdX_EHNbBsc3UnjdSMmZfKHBXA5FBcf2V3QHskME6o2_cZetVtVkRhlXcgSAK2smXGrff/s905/image5.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="489" data-original-width="905" height="347" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijclE3wC3-F5EWITLOOC4zFxE49mBpRu35jBlA0_nW9f4vl7RrEfg3FFMCTVqPYVnkOlR1cBxGdX_EHNbBsc3UnjdSMmZfKHBXA5FBcf2V3QHskME6o2_cZetVtVkRhlXcgSAK2smXGrff/w642-h347/image5.png" width="642" /></a></div><div style="text-align: center;"><span style="font-size: xx-small;">99th percentile of # of unresponsive 100ms intervals over a 30 seconds sample</span></div><div><br /></div><div><br /></div>Posted by Gabriel Charette 🤸🏼 and Etienne Bergeron 🕵🏻, Chrome Software Engineers<br /><br /><br /><br /><i>Data source for all statistics: <a href="https://www.google.com/chrome/privacy/whitepaper.html#usagestats">Real-world data</a> anonymously aggregated from Chrome clients.</i><br /></div> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> <i>We are fortunate that so many people choose Chrome as their browser to get things done, which is why we are continually investing in making Chrome more performant. But with software as complex as Chrome, there is a lot of performance left hidden in areas we aren’t actively working on. In our latest post in the <a href="https://blog.chromium.org/search/label/the%20fast%20and%20the%20curious">The Fast and the Curious</a> series, we investigate how to diagnose, find, and fix performance problems that normally go undetected.</i><br /><br /><br /><br /><h2 style="text-align: left;"><span style="font-size: x-large;">The 1%</span></h2>Our metrics show that while Chrome is fast on average, it can be noticeably slow at times. Such user-pain is visible in the 99th percentile of many of our metrics but unreproducible, and thus quite hard to act upon. Deeper analysis in the data shows that the long-tail of performance is not 1% of users on slow machines but rather many users, 1% of the time.<br /><br />Let’s talk about 1%. 1% is quite large in practice. The core metric we use is “jank” which is a noticeable delay between when the user gives input and when software reacts to it. Chrome measures jank every 30 seconds, so Jank in 1% of samples for a given user means jank once every 50 minutes. To that user, Chrome feels slow at those moments. Now the problem: can we find and fix the root causes of all the ways Chrome can be momentarily slow for our users?<br /><br /><div><br /></div><div><br /></div><div><h2 style="text-align: left;"><span style="font-size: x-large;">Approach</span></h2>As engineers, our training in optimization is to focus on improving the algorithmic performance of the components we own. The last 3 years of analyzing the immensely complex codebase of Chrome however have taught us that the real issue is often cross-cutting: multiple unrelated features’ long-tail performance issues, sharing the same systemic root cause(s). Applying local expertise and optimization is likely to miss the global optimum. It is necessary to disregard our initial intuition and assume ignorance, forcing us to dig beyond what is immediately apparent and find the underlying root cause by relentlessly exposing what we don’t know.</div><div><br /></div><div><br /></div><div><br /><h2 style="text-align: left;"><span style="font-size: x-large;">Chasing Invisible Bugs</span></h2>How do we find bugs that are unforeseen, unreproducible, unowned, and essentially invisible?<br /><br />First, define a scenario. For this work, we focus on user-visible Jank, which we <a href="https://chromium.googlesource.com/chromium/src/+/master/tools/metrics/histograms/README.md">measure in the field</a> as a way to systematically identify moments where Chrome feels slow.<br /><br />Second, gather high actionability bug reports in the field. For this we rely on Chrome’s <a href="https://source.chromium.org/search?q=BackgroundTracing&ss=chromium">BackgroundTracing</a> infrastructure to generate what we call Slow Reports. A subset of Canary users who have opted in to sharing anonymized metrics have circular-buffer tracing enabled to examine specific scenarios. If a preconfigured threshold on a metric of interest is hit, the trace buffer is captured, anonymized, and uploaded to Google servers.<br /><br />Such a bug report might look like this:</div><div><br /></div><div><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuamYfrtx4rDkQAW9KBorT5zdM8EkMamWGuPsnDU8VW7iJfMzm0j_NozS7ak7z1xQEMuIXFL_6LLMX7VsfkJFlEjwv_9C5Uhyphenhyphen6ywYquTNFb02c6NrXJegyZzka-pPVUJbLPFDoEprW8L6F/s1351/image1.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="190" data-original-width="1351" height="92" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuamYfrtx4rDkQAW9KBorT5zdM8EkMamWGuPsnDU8VW7iJfMzm0j_NozS7ak7z1xQEMuIXFL_6LLMX7VsfkJFlEjwv_9C5Uhyphenhyphen6ywYquTNFb02c6NrXJegyZzka-pPVUJbLPFDoEprW8L6F/w654-h92/image1.png" width="654" /></a></div><span style="font-size: xx-small;"><div style="text-align: center;">chrome://tracing view of a 2 seconds Jank on AutocompleteController::UpdateResult() on an otherwise healthy machine</div></span><br /><br />We have a culprit! Let’s optimize AutocompleteController? No! We don’t know why yet: keep assuming ignorance!<br /><br />By augmenting BackgroundTracing with stack sampling, we were able to find a recurring stack under stalled AutoComplete events:</div><div><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><br /></span></div><div><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><span>    </span>RegEnumValueW</span></div><div><span id="docs-internal-guid-4a961e85-7fff-418a-ea39-3b655b9b59f5"><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><span>    </span>RegEnumValueWStub</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><span>    </span>base::win::RegistryValueIterator::Read()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><span>    </span>gfx::`anonymous namespace\'::CachedFontLinkSettings::GetLinkedFonts</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::internal::LinkedFontsIterator::GetLinkedFonts()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::internal::LinkedFontsIterator::NextFont(gfx::Font *)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::GetFallbackFonts(gfx::Font const &)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::RenderTextHarfBuzz::ShapeRuns(...)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::RenderTextHarfBuzz::ItemizeAndShapeText(...)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::RenderTextHarfBuzz::EnsureLayoutRunList()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::RenderTextHarfBuzz::EnsureLayout()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::RenderTextHarfBuzz::GetStringSizeF()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>gfx::RenderTextHarfBuzz::GetStringSize()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxTextView::CalculatePreferredSize()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxTextView::ReapplyStyling()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxTextView::SetText...)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxResultView::Invalidate()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxResultView::SetMatch(AutocompleteMatch const &)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; white-space: pre-wrap;"><span>    </span>OmniboxPopupContentsView::UpdatePopupAppearance()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxPopupModel::OnResultChanged()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxEditModel::OnCurrentMatchChanged()</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>OmniboxController::OnResultChanged(bool)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>AutocompleteController::UpdateResult(bool,bool)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>AutocompleteController::Start(AutocompleteInput const &)</span></p><p dir="ltr" style="line-height: 1.38; margin-bottom: 0pt; margin-top: 0pt;"><span style="font-family: inherit; font-size: 11pt; font-variant-east-asian: normal; font-variant-numeric: normal; vertical-align: baseline; white-space: pre-wrap;"><span>    </span>(...)</span></p><div><br /></div></span></div><div>Ah ha! Autocomplete is not at fault. Time to optimize GetFallbackFonts()?! But wait… Why is GetFallbackFonts() even called in the first place?<br /><br />And before we figure that out, how do we know this is the #1 root cause of our overall long-tail performance issue? We’ve only looked at one trace so far after all...</div><div><br /></div><div><br /></div><div><br /><h2 style="text-align: left;"><span style="font-size: x-large;">The Measurement Conundrum</span></h2>The metrics tell us how many users are affected and how bad it is, but they do not highlight the root cause.<br /><br />Slow Reports tell us what the problem is for a specific user but not how many users are affected. And while we can query our corpus of Slow Report traces, it comes with inherent biases that make it impossible to correlate 1:1 with metrics. For instance, because Chrome only reports the first instance of bad performance per-session and only for users of the Canary/Dev channel, there’s both a startup and a population bias.<br /><br />This is the measurement conundrum. The more actionability (data) a tool provides, the fewer scenarios it captures and the more bias it incurs. Depth vs. breadth.<br /><br />Tools that attempt to do both sit somewhere in the middle, where they use aggregation over a large dataset and risk showing aggregate results based on flawed input (e.g. circular buffer tracing having dropped the interesting portion and contributing to a biased aggregate).<br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJgG5FJ_GzIKmhTioVzKejDcx8y6ohL5lUoHr6LYV9k4LbdVmu4ZebMXleU1TSc2Ri8KQCAxzomAn1ZvHYsiQOB3yuJNNlZH_YZq4I1h4ITZO1Pn2DZIKqk08oTAAu_IGv__P6kPxyH9J_/s1140/image4.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="702" data-original-width="1140" height="334" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJgG5FJ_GzIKmhTioVzKejDcx8y6ohL5lUoHr6LYV9k4LbdVmu4ZebMXleU1TSc2Ri8KQCAxzomAn1ZvHYsiQOB3yuJNNlZH_YZq4I1h4ITZO1Pn2DZIKqk08oTAAu_IGv__P6kPxyH9J_/w542-h334/image4.png" width="542" /></a></div><div style="text-align: center;"><br /></div><br /><br />Thus we scientifically opted for the least engineering-minded option: open a bunch of Slow Report traces manually. This gave us the most actionability over a top-level issue we’d already quantified.<br /><br />After opening dozens of traces it turned out that a great majority showed variations of the aforementioned fonts issue. While this didn’t give us a precise #users-affected, it was enough for us to believe it was the main cause of user pain seen in the metrics.</div><div><br /></div><div><br /></div><div><br /></div><div><br /><h2 style="text-align: left;"><span style="font-size: x-large;">Fallback Fonts</span></h2>We dug into why GetFallbackFonts() had to be called in the first place. In the example above, the caller is trying to determine the size in pixels of a Unicode string rendered by a given font.<br /><br />If a substring within it is from a <a href="https://en.wikipedia.org/wiki/Unicode_block">Unicode Block</a> that can’t be rendered by the given font, GetFallbackFont() is used to request the system recommended fallback font for it. If that fails, GetFallbackFonts() is invoked to try all the <a href="https://docs.microsoft.com/en-us/globalization/input/font-technology">linked fonts</a> and determine the one that can best render it; that second fallback is much slower.<br /><br />GetFallbackFont() should never fail, but in practice it’s not that simple. The reliable way to do this on Windows is to query <a href="https://docs.microsoft.com/en-us/windows/win32/directwrite/introducing-directwrite">DirectWrite</a>; however, DirectWrite was added in Windows 7, when Chrome still supported Windows XP. Therefore the GetFallbackFont() logic was forced to stick to a less reliable <a href="https://chromium.googlesource.com/chromium/src/+/22aed04422b04b2cf04f7b7d61392da4e9a2c85a/ui/gfx/font_fallback_win.cc#303">heuristic using Uniscribe+GDI</a> in order to work on both versions of the OS. Since things worked most of the time, no one noticed that this could have been cleaned up when Chrome later dropped support for Windows XP. With new tooling to investigate long-tail performance, this turned out to be the number one cause of jank (unnecessarily invoking GetFallbackFonts()).<br /><br />We <a href="https://chromium-review.googlesource.com/c/chromium/src/+/1663504/">fixed</a> that, reducing the amount of calls to GetFallbackFonts() by 4x.</div><div><br /></div><div><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjoS0pmpqWu93gtMQh1cRD6OcC3F60XoaMDHxOjzg2DVQLrht0IPOwW-ump4C81YHswCaF_NiejtJZo8fCdZGmW3PgANB4m8R-Y9WVJDFjzbuyIB0FiRHYnMVK6bQlBg_K5tfrErbMHmhyb/s1244/image3.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="487" data-original-width="1244" height="258" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjoS0pmpqWu93gtMQh1cRD6OcC3F60XoaMDHxOjzg2DVQLrht0IPOwW-ump4C81YHswCaF_NiejtJZo8fCdZGmW3PgANB4m8R-Y9WVJDFjzbuyIB0FiRHYnMVK6bQlBg_K5tfrErbMHmhyb/w660-h258/image3.png" width="660" /></a></div><div style="text-align: center;"><br /></div><br /><br />Still not zero though, and still seeing instances of the aforementioned AutoComplete issue in our Slow Reports. Keep digging. DirectWrite’s GetFallbackFont() failing was unexpected, but since Slow Reports are anonymized, no user-generated strings can be uploaded -- and therefore, finding which codepoints were problematic was tricky. We teamed up with our privacy experts to instrument Unicode Block and Script of text blocks going through <a href="https://en.wikipedia.org/wiki/HarfBuzz">HarfBuzz</a> so that we could ensure no leakage of <a href="https://en.wikipedia.org/wiki/Personal_data">Personally Identifiable Information</a>.</div><div><br /></div><div><br /></div><div>  <br /><h2 style="text-align: left;"><span style="font-size: x-large;">The Emoji Saga</span></h2>With this new recording enabled, the next wave of Slow Reports came back. The vast majority of reports indicated that font fallback was failing when DirectWrite was being asked to find a font for a codepoint (Unicode character) in <a href="https://www.compart.com/en/unicode/block/U+1F300">Miscellaneous Symbols and Pictographs</a>. We wrote a local script trying all codepoints in that Unicode Block and quickly found out which ones could be problematic: U+1F3FB - U+1F3FF are modifiers added in Unicode 8.0 and are meaningful only when paired with another codepoint. For instance, U+1F9D7 (🧗) when paired with U+1F3FF is 🧗🏿. No font can render U+1F3FF on its own, and font fallback would correctly error out after scanning all linked fonts when asked to find one. The bug was in the browser-side Unicode <a href="https://unicode.org/reports/tr29/">segmentation</a> logic which incorrectly broke down these two <a href="https://en.wikipedia.org/wiki/Code_point">codepoints</a> and asked DirectWrite to render them separately instead of keeping them as a single grapheme.<br /><br />But wait, doesn’t Chrome support modern Unicode..?! Indeed, it does, in Blink which renders the web content. But the browser-side logic was not updated to support modern emojis (with modifiers) because it didn’t use to draw emojis at all. It’s only when the browser UI (tab strip, bookmark bar, omnibox, etc.) was modernized to support Unicode circa 2018 that the legacy segmentation logic became an (invisible) problem.<br /><br />On top of that, the caching logic did not cache on error, so trying to render a modifier on its own caused a massive jank, every time, for users with a lot of fonts installed. Ironically, this cache had been added to amortize the cost of this misunderstood bottleneck when Unicode support was first added to browser UI. Diving deeper into the underlying implementation of our fonts logic, rather than stopping at the layer of the fonts APIs, not only fixed a major performance issue but also resulted in a correctness fix for other <a href="https://emojipedia.org/emoji/">emojis</a>. For instance, 🏳️‍🌈 is encoded as U+1F3F3( 🏳️) + U+1F308 (🌈); before the itemization fix, browser UI would incorrectly render this grapheme as 🏳️🌈.<br /><br /><br /><br /><h2 style="text-align: left;"><span style="font-size: x-large;">And the journey continues...</span></h2>Our journey keeps going into various components of Chrome but it always follows the same basic playbook: assume ignorance and relentlessly investigate unforeseen, unreproducible, and unowned bugs. And while stack ranking issues is nigh impossible (see: measurement conundrum), fixing the top 5 findings from any given tool and zooming in on the long tail has always addressed the majority of the user pain in practice.<br /><br />Using this approach, we have reduced user-visible jank by a factor of 10X over the last 2.5 years and improved long-tail performance of many features caught in the cross-fire. <br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijclE3wC3-F5EWITLOOC4zFxE49mBpRu35jBlA0_nW9f4vl7RrEfg3FFMCTVqPYVnkOlR1cBxGdX_EHNbBsc3UnjdSMmZfKHBXA5FBcf2V3QHskME6o2_cZetVtVkRhlXcgSAK2smXGrff/s905/image5.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="489" data-original-width="905" height="347" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijclE3wC3-F5EWITLOOC4zFxE49mBpRu35jBlA0_nW9f4vl7RrEfg3FFMCTVqPYVnkOlR1cBxGdX_EHNbBsc3UnjdSMmZfKHBXA5FBcf2V3QHskME6o2_cZetVtVkRhlXcgSAK2smXGrff/w642-h347/image5.png" width="642" /></a></div><div style="text-align: center;"><span style="font-size: xx-small;">99th percentile of # of unresponsive 100ms intervals over a 30 seconds sample</span></div><div><br /></div><div><br /></div>Posted by Gabriel Charette 🤸🏼 and Etienne Bergeron 🕵🏻, Chrome Software Engineers<br /><br /><br /><br /><i>Data source for all statistics: <a href="https://www.google.com/chrome/privacy/whitepaper.html#usagestats">Real-world data</a> anonymously aggregated from Chrome clients.</i><br /></div> <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' 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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> <span dir='ltr'> long-tail </span> <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> <a dir='ltr' href='https://blog.chromium.org/search/label/v8'> v8 </a> <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> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/WebM'> WebM </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/webmaster'> webmaster </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/webp'> webp </a> <span dir='ltr'> 5 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/webrtc'> webrtc </a> <span dir='ltr'> 6 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/websockets'> websockets </a> <span dir='ltr'> 5 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/webtiming'> webtiming </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/writable-files'> writable-files </a> <span dir='ltr'> 1 </span> </li> <li> <a dir='ltr' href='https://blog.chromium.org/search/label/yerba%20beuna%20center%20for%20the%20arts'> yerba beuna center for the arts </a> <span dir='ltr'> 1 </span> </li> </ul> <div class='clear'></div> </div> </div><div class='widget BlogArchive' data-version='1' id='BlogArchive1'> <div class='tab'> <i class='material-icons icon'>  </i> <h2> Archive </h2> <i class='material-icons arrow'>  </i> </div> <div class='widget-content'> <div id='ArchiveList'> <div id='BlogArchive1_ArchiveList'> <ul class='hierarchy'> <li class='archivedate expanded'> <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 toggle-open'> <i class='material-icons'>  </i>   </span> </a> <a class='post-count-link' href='https://blog.chromium.org/2024/'> 2024 </a> </div> <div class='items'> <ul class='hierarchy'> <li class='archivedate expanded'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2024/08/'> 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/2024/06/'> Jun </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate 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style='display: none'> <span class='zippy'> <i class='material-icons'>  </i>   </span> </a> <a class='post-count-link' href='https://blog.chromium.org/2023/'> 2023 </a> </div> <div class='items'> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2023/11/'> 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/2023/10/'> 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/2023/09/'> 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/2023/08/'> 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/2023/06/'> 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/2023/05/'> 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/2023/04/'> 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/2023/02/'> Feb </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/2022/'> 2022 </a> </div> <div class='items'> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2022/12/'> 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/2022/09/'> 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/2022/08/'> 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/2022/06/'> Jun </a> </div> <div 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href='https://blog.chromium.org/2021/10/'> 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/2021/09/'> 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/2021/08/'> 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/2021/07/'> 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/2021/06/'> 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/2021/05/'> 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/2021/04/'> 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/2021/03/'> 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/2021/02/'> 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/2021/01/'> Jan </a> </div> <div class='items'> </div> </li> </ul> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class='intervalToggle'> 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class=''> <a class='post-count-link' href='https://blog.chromium.org/2020/09/'> 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/2020/08/'> 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/2020/07/'> 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/2020/06/'> 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/2020/05/'> May </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> 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class='zippy'> <i class='material-icons'>  </i>   </span> </a> <a class='post-count-link' href='https://blog.chromium.org/2019/'> 2019 </a> </div> <div class='items'> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2019/12/'> 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/2019/11/'> 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/2019/10/'> 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/2019/09/'> Sep </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/2019/03/'> 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/2019/02/'> 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/2019/01/'> 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/2018/'> 2018 </a> </div> <div class='items'> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2018/12/'> 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/2018/11/'> 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/2018/10/'> 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/2018/09/'> 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/2018/08/'> Aug </a> </div> <div class='items'> </div> </li> 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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 class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2016/11/'> 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/2016/10/'> 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/2016/09/'> 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/2016/08/'> 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/2016/06/'> 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/2016/05/'> 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/2016/04/'> 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/2016/03/'> 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/2016/02/'> 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/2016/01/'> Jan </a> </div> <div class='items'> </div> </li> </ul> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class='intervalToggle'> 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class=''> <a class='post-count-link' href='https://blog.chromium.org/2015/09/'> 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/2015/08/'> 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/2015/07/'> 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/2015/06/'> 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/2015/05/'> May </a> </div> <div class='items'> </div> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <div class=''> 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class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2014/03/'> 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/2014/02/'> 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/2014/01/'> 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/2013/'> 2013 </a> </div> <div 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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> 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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 class='archivedate collapsed'> <div class=''> <a class='post-count-link' href='https://blog.chromium.org/2011/11/'> 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/2011/10/'> 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/2011/09/'> 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/2011/08/'> 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/2011/07/'> 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/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'> 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