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. 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