Performance | Chrome for Developers

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href="https://developer.chrome.google.cn/docs/performance?hl=tr" /><link rel="alternate" hreflang="vi-cn" href="https://developer.chrome.google.cn/docs/performance?hl=vi" /><title>Performance  |  Chrome for Developers</title> <meta property="og:title" content="Performance  |  Chrome for Developers"><meta name="description" content="Optimize the performance of your web applications with Chrome's performance tools."> <meta property="og:description" content="Optimize the performance of your web applications with Chrome's performance tools."><meta property="og:url" content="https://developer.chrome.com/docs/performance"><meta property="og:locale" content="en"><script type="application/ld+json"> { "@context": "https://schema.org", "@type": "Article", "headline": "Performance" } </script><script type="application/ld+json"> { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [{ "@type": "ListItem", "position": 1, "name": "Docs", "item": 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role="presentation"> <a role="menuitem" lang="th" >ภาษาไทย</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_cn" >中文 – 简体</a> </li> <li role="presentation"> <a role="menuitem" lang="zh_tw" >中文 – 繁體</a> </li> <li role="presentation"> <a role="menuitem" lang="ja" >日本語</a> </li> <li role="presentation"> <a role="menuitem" lang="ko" >한국어</a> </li> </ul> </devsite-language-selector> <devsite-user enable-profiles id="devsite-user"> <span class="button devsite-top-button" aria-hidden="true" visually-hidden>Sign in</span> </devsite-user> </div> </div> </div> <div class="devsite-collapsible-section "> <div class="devsite-header-background"> <div class="devsite-doc-set-nav-row"> <devsite-tabs class="lower-tabs"> <nav class="devsite-tabs-wrapper" aria-label="Lower tabs"> <tab class="devsite-active"> <a href="https://developer.chrome.com/docs/performance" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://developer.chrome.com/docs/performance" 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class="devsite-nav-item-title"> Passkeys </div> </a> </li> </ul> </div> </div> </div> </tab> <tab > <a href="https://developer.chrome.com/docs/payments" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://developer.chrome.com/docs/payments" track-type="nav" track-metadata-position="nav - payments" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Payments" track-name="payments" > Payments </a> </tab> <tab > <a href="https://developer.chrome.com/docs/privacy-security" class="devsite-tabs-content gc-analytics-event " track-metadata-eventdetail="https://developer.chrome.com/docs/privacy-security" track-type="nav" track-metadata-position="nav - privacy and security" track-metadata-module="primary nav" data-category="Site-Wide Custom Events" data-label="Tab: Privacy and security" track-name="privacy and security" > Privacy and security </a> </tab> </nav> </devsite-tabs> </div> </div> </div> </div> </devsite-header> 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track-metadata-eventDetail="nav"> <picture> <source srcset="https://www.gstatic.com/devrel-devsite/prod/v38a693baeb774512feb42f10aac8f755d8791ed41119b5be7a531f8e16f8279f/chrome/images/lockup-dark-theme.svg" media="(prefers-color-scheme: dark)" class="devsite-dark-theme" alt="Chrome for Developers"> <img src="https://www.gstatic.com/devrel-devsite/prod/v38a693baeb774512feb42f10aac8f755d8791ed41119b5be7a531f8e16f8279f/chrome/images/lockup.svg" class="devsite-site-logo" alt="Chrome for Developers"> </picture> </a> <span class="devsite-product-name"> <ul class="devsite-breadcrumb-list" > <li class="devsite-breadcrumb-item "> </li> </ul> </span> </div> </div> <div class="devsite-book-nav-wrapper"> <div class="devsite-mobile-nav-top"> <ul class="devsite-nav-list"> <li class="devsite-nav-item"> <a href="/case-studies" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Get inspired" track-name="get inspired" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Get inspired" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Get inspired </span> </a> </li> <li class="devsite-nav-item"> <a href="/blog" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Blog" track-name="blog" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Blog" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Blog </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs" class="devsite-nav-title gc-analytics-event devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Docs" track-name="docs" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Docs" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Docs </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu "> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Docs" track-name="docs" > <span class="devsite-nav-text" tooltip menu="Docs"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Docs"> </span> </span> </li> </ul> <ul class="devsite-nav-responsive-tabs"> <li class="devsite-nav-item"> <a href="/docs/performance" class="devsite-nav-title gc-analytics-event devsite-nav-has-children devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Performance" track-name="performance" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Performance" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip menu="_book"> Performance </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="_book"> </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/css-ui" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: CSS and UI" track-name="css and ui" data-category="Site-Wide Custom Events" data-label="Responsive Tab: CSS and UI" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > CSS and UI </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/identity" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Identity" track-name="identity" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Identity" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Identity </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> <ul class="devsite-nav-responsive-tabs devsite-nav-has-menu devsite-lower-tab-item"> <li class="devsite-nav-item"> <span class="devsite-nav-title" tooltip data-category="Site-Wide Custom Events" data-label="Tab: Identity" track-name="identity" > <span class="devsite-nav-text" tooltip menu="Identity"> More </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="Identity"> </span> </span> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/docs/payments" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Payments" track-name="payments" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Payments" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Payments </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/privacy-security" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Privacy and security" track-name="privacy and security" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Privacy and security" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Privacy and security </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/new" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: New in Chrome" track-name="new in chrome" data-category="Site-Wide Custom Events" data-label="Responsive Tab: New in Chrome" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > New in Chrome </span> </a> </li> </ul> </div> <div class="devsite-mobile-nav-bottom"> <ul class="devsite-nav-list" menu="Docs" aria-label="Side menu" hidden> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Build with Chrome </span> </span> </li> <li class="devsite-nav-item"> <a href="/docs/web-platform" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Web Platform" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Web Platform </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/capabilities" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Capabilities" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Capabilities </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/chromedriver" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: ChromeDriver" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > ChromeDriver </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/extensions" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Extensions" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Extensions </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/webstore" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Chrome Web Store" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Chrome Web Store </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/chromium" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Chromium" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Chromium </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/aurora" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Aurora" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Aurora </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/android" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Web on Android" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Web on Android </span> </a> </li> <li class="devsite-nav-item"> <a href="https://developer.chrome.com/origintrials/" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Origin trials" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Origin trials </span> </a> </li> <li class="devsite-nav-item"> <a href="/release-notes" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Release notes" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Release notes </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Productivity </span> </span> </li> <li class="devsite-nav-item"> <a href="/docs/devtools" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: DevTools" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > DevTools </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/lighthouse" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Lighthouse" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Lighthouse </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/crux" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide 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track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Performance </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/css-ui" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: CSS and UI" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > CSS and UI </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/identity" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Identity" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Identity </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/payments" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Payments" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Payments </span> </a> </li> <li class="devsite-nav-item"> <a href="/docs/privacy-security" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Privacy and security" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Privacy and security </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Resources </span> </span> </li> <li class="devsite-nav-item"> <a href="/docs" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: All documentation" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > All documentation </span> </a> </li> <li class="devsite-nav-item"> <a href="https://web.dev/baseline" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Baseline" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Baseline </span> </a> </li> <li class="devsite-nav-item"> <a href="https://web.dev" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: web.dev" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > web.dev </span> </a> </li> <li class="devsite-nav-item"> <a href="https://pagespeed.web.dev" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: PageSpeed Insights audit" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > PageSpeed Insights audit </span> </a> </li> </ul> <ul class="devsite-nav-list" menu="Identity" aria-label="Side menu" hidden> <li class="devsite-nav-item"> <a href="/docs/identity/passkeys" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Passkeys" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Passkeys </span> </a> </li> </ul> </div> </div> </nav> </devsite-book-nav> <section id="gc-wrapper"> <main role="main" id="main-content" class="devsite-main-content" > <div class="devsite-sidebar"> <div class="devsite-sidebar-content"> <devsite-toc class="devsite-nav" role="navigation" aria-label="On this page" depth="2" scrollbars disabled></devsite-toc> <devsite-recommendations-sidebar class="nocontent devsite-nav"> </devsite-recommendations-sidebar> </div> </div> <devsite-content> <article class="devsite-article"> <div class="devsite-article-meta nocontent" role="navigation"> <ul class="devsite-breadcrumb-list" aria-label="Breadcrumb"> <li class="devsite-breadcrumb-item "> <a href="https://developer.chrome.com/" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="1" track-type="globalNav" track-name="breadcrumb" track-metadata-position="1" track-metadata-eventdetail="" > Home </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://developer.chrome.com/docs" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="2" track-type="globalNav" track-name="breadcrumb" track-metadata-position="2" track-metadata-eventdetail="Docs" > Docs </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://developer.chrome.com/docs/performance" class="devsite-breadcrumb-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Breadcrumbs" data-value="3" track-type="globalNav" track-name="breadcrumb" track-metadata-position="3" track-metadata-eventdetail="Performance" > Performance </a> </li> </ul> </div> <devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded disabled> </devsite-toc> <div class="devsite-article-body clearfix "> <section class="devsite-landing-row devsite-landing-row-1-up devsite-landing-row-50 devsite-landing-row-hero devsite-landing-row-large-headings" background="blue" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="performance" data-text="Performance" class="hide-from-toc no-link" tabindex="0"> Performance </h3> <div class="devsite-landing-row-item-description-content"> Discover tools and techniques from Chrome to improve your site's performance. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://pagespeed.web.dev" class="button button-primary " >Test a site</a> <a href="https://developer.chrome.com/docs/lighthouse/performance/performance-scoring" class="button button-primary " >Lighthouse audits</a> <a href="https://developer.chrome.com/docs/devtools/performance" class="button button-primary " >Analyze with DevTools</a> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-2-up" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-column"> <h2 id="devtools" data-text="DevTools" tabindex="0"> DevTools </h2> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <a href="https://developer.chrome.com/docs/devtools"> <div class="devsite-landing-row-item-icon-container" background="grey" foreground="white" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> book </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="get-started-with-devtools" data-text="Get started with DevTools" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/devtools"> Get started with DevTools </a> </h3> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <a href="https://developer.chrome.com/docs/devtools/performance"> <div class="devsite-landing-row-item-icon-container" background="grey" foreground="white" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="analyze-runtime-performance" data-text="Analyze runtime performance" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/devtools/performance"> Analyze runtime performance </a> </h3> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <a href="https://developer.chrome.com/docs/devtools/performance/reference"> <div class="devsite-landing-row-item-icon-container" background="grey" foreground="white" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="features-reference" data-text="Features reference" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/devtools/performance/reference"> Features reference </a> </h3> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <a href="https://developer.chrome.com/docs/devtools/performance/timeline-reference"> <div class="devsite-landing-row-item-icon-container" background="grey" foreground="white" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="timeline-event-reference" data-text="Timeline event reference" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/devtools/performance/timeline-reference"> Timeline event reference </a> </h3> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <a href="https://developer.chrome.com/docs/devtools/performance-insights"> <div class="devsite-landing-row-item-icon-container" background="grey" foreground="white" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="get-actionable-insights-on-your-websites-performance" data-text="Get actionable insights on your website's performance" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/devtools/performance-insights"> Get actionable insights on your website's performance </a> </h3> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <a href="https://pagespeed.web.dev/"> <div class="devsite-landing-row-item-icon-container" background="grey" foreground="white" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="get-started-with-site-speed" data-text="Get started with site speed" class="hide-from-toc no-link" tabindex="0"> <a href="https://pagespeed.web.dev/"> Get started with site speed </a> </h3> </div> </div> </div> </div> <div class="devsite-landing-row-column"> <h2 id="lighthouse" data-text="Lighthouse" tabindex="0"> Lighthouse </h2> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <a href="https://developer.chrome.com/docs/lighthouse"> <div class="devsite-landing-row-item-icon-container" background="grey" foreground="white" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> book </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="get-started-with-lighthouse" data-text="Get started with Lighthouse" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/lighthouse"> Get started with Lighthouse </a> </h3> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <a href="https://developer.chrome.com/docs/lighthouse/performance/performance-scoring"> <div class="devsite-landing-row-item-icon-container" background="grey" foreground="white" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="performance-audit-scoring" data-text="Performance audit scoring" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/lighthouse/performance/performance-scoring"> Performance audit scoring </a> </h3> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <a href="https://developer.chrome.com/docs/lighthouse/performance/first-contentful-paint"> <div class="devsite-landing-row-item-icon-container" background="grey" foreground="white" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="metrics" data-text="Metrics" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/lighthouse/performance/first-contentful-paint"> Metrics </a> </h3> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="left" > <a 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material-icons" aria-hidden="true"> article </div> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="diagnostics" data-text="Diagnostics" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.chrome.com/docs/lighthouse/performance/total-byte-weight"> Diagnostics </a> </h3> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-1-up devsite-landing-row-67 devsite-landing-row-large-headings devsite-landing-row-no-image-background" background="grey" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item" description-position="top" > <div class="devsite-landing-row-item-media "> <figure class="devsite-landing-row-item-image"> <picture> <img alt="" src="https://developer.chrome.com/static/docs/performance/images/learnperformance.svg" srcset="https://developer.chrome.com/static/docs/performance/images/learnperformance.svg" sizes="(max-width: 600px) 100vw, (max-width: 840px) 50vw, 464px" loading="lazy" > </picture> </figure> </div> <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <div class="devsite-landing-row-item-labels"> <span class=" " >COURSE</span> </div> <h3 id="learn-performance" data-text="Learn Performance" class="hide-from-toc no-link" tabindex="0"> Learn Performance </h3> <div class="devsite-landing-row-item-description-content"> <p>Web performance is a crucial aspect of web development that focuses on the speed at which pages load, as well as how responsive they are to user input. When you optimize your website for performance, you're giving users a better experience. 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