Fast load times

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button-flat material-icons gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Close navigation" aria-label="Close navigation"> </button> <div class="devsite-product-name-wrapper"> <a href="/" class="devsite-site-logo-link gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Site logo" track-type="globalNav" track-name="webDev" track-metadata-position="nav" track-metadata-eventDetail="nav"> <picture> <source srcset="https://www.gstatic.com/devrel-devsite/prod/v870e399c64f7c43c99a3043db4b3a74327bb93d0914e84a0c3dba90bbfd67625/web/images/lockup-dark-theme.svg" media="(prefers-color-scheme: dark)" class="devsite-dark-theme" alt="web.dev"> <img src="https://www.gstatic.com/devrel-devsite/prod/v870e399c64f7c43c99a3043db4b3a74327bb93d0914e84a0c3dba90bbfd67625/web/images/lockup.svg" class="devsite-site-logo" alt="web.dev"> </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="/about" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: About" track-name="about" data-category="Site-Wide Custom Events" data-label="Responsive Tab: About" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > About </span> </a> </li> <li class="devsite-nav-item"> <a href="/html" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: HTML" track-name="html" data-category="Site-Wide Custom Events" data-label="Responsive Tab: HTML" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > HTML </span> </a> </li> <li class="devsite-nav-item"> <a href="/css" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: CSS" track-name="css" data-category="Site-Wide Custom Events" data-label="Responsive Tab: CSS" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > CSS </span> </a> </li> <li class="devsite-nav-item"> <a href="/javascript" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: JavaScript" track-name="javascript" data-category="Site-Wide Custom Events" data-label="Responsive Tab: JavaScript" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > JavaScript </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="/learn" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Learn" track-name="learn" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Learn" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Learn </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore" class="devsite-nav-title gc-analytics-event devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Explore" track-name="explore" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Explore" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Explore </span> </a> <ul class="devsite-nav-responsive-tabs"> <li class="devsite-nav-item"> <a href="/explore/learn-core-web-vitals" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Core Web Vitals" track-name="core web vitals" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Core Web Vitals" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Core Web Vitals </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/metrics" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Metrics" track-name="metrics" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Metrics" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Metrics </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/fast" class="devsite-nav-title gc-analytics-event devsite-nav-has-children devsite-nav-active" data-category="Site-Wide Custom Events" data-label="Tab: Fast load times" track-name="fast load times" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Fast load times" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip menu="_book"> Fast load times </span> <span class="devsite-nav-icon material-icons" data-icon="forward" menu="_book"> </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/ai" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: AI" track-name="ai" data-category="Site-Wide Custom Events" data-label="Responsive Tab: AI" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > AI </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/how-to-optimize-inp" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Optimize Interaction to Next Paint (INP)" track-name="optimize interaction to next paint (inp)" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Optimize Interaction to Next Paint (INP)" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Optimize Interaction to Next Paint (INP) </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/progressive-web-apps" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Progressive Web Apps" track-name="progressive web apps" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Progressive Web Apps" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Progressive Web Apps </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/accessibility" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Accessible to all" track-name="accessible to all" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Accessible to all" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Accessible to all </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/reliable" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Network reliability" track-name="network reliability" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Network reliability" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Network reliability </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/secure" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Safe and secure" track-name="safe and secure" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Safe and secure" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Safe and secure </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/discoverable" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Easily discoverable" track-name="easily discoverable" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Easily discoverable" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Easily discoverable </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/payments" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Web Payments" track-name="web payments" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Web Payments" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Web Payments </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/media" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Media" track-name="media" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Media" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Media </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/devices" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Devices" track-name="devices" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Devices" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Devices </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/animations" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Animations" track-name="animations" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Animations" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Animations </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/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> </li> <li class="devsite-nav-item"> <a href="/explore/webassembly" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: WebAssembly" track-name="webassembly" data-category="Site-Wide Custom Events" data-label="Responsive Tab: WebAssembly" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > WebAssembly </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/test-automation" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Test automation" track-name="test automation" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Test automation" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Test automation </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/react" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: React" track-name="react" data-category="Site-Wide Custom Events" data-label="Responsive Tab: React" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > React </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/angular" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Angular" track-name="angular" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Angular" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Angular </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> <li class="devsite-nav-item"> <a href="/explore/mini-apps" class="devsite-nav-title gc-analytics-event devsite-nav-has-children " data-category="Site-Wide Custom Events" data-label="Tab: Mini apps" track-name="mini apps" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Mini apps" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Mini apps </span> <span class="devsite-nav-icon material-icons" data-icon="forward" > </span> </a> </li> </ul> </li> <li class="devsite-nav-item"> <a href="/patterns" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Tab: Patterns" track-name="patterns" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Patterns" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Patterns </span> </a> </li> <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: Case studies" track-name="case studies" data-category="Site-Wide Custom Events" data-label="Responsive Tab: Case studies" track-type="globalNav" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Case studies </span> </a> </li> </ul> </div> </div> </nav> </devsite-book-nav> <section id="gc-wrapper"> <main role="main" 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"><style> /* Styles inlined from /explore/patch.css */ [theme=web-theme] .devsite-landing-row-3-up.wd-explore-3up .devsite-landing-row-item { text-align: left; } [theme=web-theme] .wd-explore-3up .devsite-landing-row-item-list-item-description h4 { padding: 0; } .wd-explore-3up .devsite-landing-row-item-list-item-description a:hover{ text-decoration: underline; } [theme=web-theme] .devsite-landing-row-3-up .devsite-landing-row-item.wd-3col-icons-list { text-align: left; } [theme=web-theme] .wd-explore-2up .devsite-landing-row-item-list-item-description a:hover{ text-decoration: underline; } [theme=web-theme] .wd-explore-2up .devsite-landing-row-item-list-item-description h4 { padding: 0; } [theme=web-theme] .devsite-landing-row-item-buttons.left { justify-self: flex-start; } [theme=web-theme] .devsite-landing-row-3-up.devsite-landing-row-cards img { max-height: 200px; object-fit: cover; } </style> <div class="devsite-article-meta nocontent" role="navigation"> <ul class="devsite-breadcrumb-list" aria-label="Breadcrumb"> <li class="devsite-breadcrumb-item "> <a href="https://web.dev/" 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="web.dev" > web.dev </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://web.dev/explore" 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="" > Explore </a> </li> <li class="devsite-breadcrumb-item "> <div class="devsite-breadcrumb-guillemet material-icons" aria-hidden="true"></div> <a href="https://web.dev/explore/fast" 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="" > Fast load times </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-75 devsite-landing-row-hero 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="bottom" > <div class="devsite-landing-row-item-media "> <figure class="devsite-landing-row-item-image"> <picture> <img alt="" src="https://web.dev/static/explore/fast/cover.png" srcset="https://web.dev/static/explore/fast/cover_36.png 36w,https://web.dev/static/explore/fast/cover_48.png 48w,https://web.dev/static/explore/fast/cover_72.png 72w,https://web.dev/static/explore/fast/cover_96.png 96w,https://web.dev/static/explore/fast/cover_480.png 480w,https://web.dev/static/explore/fast/cover_720.png 720w,https://web.dev/static/explore/fast/cover_856.png 856w,https://web.dev/static/explore/fast/cover_960.png 960w,https://web.dev/static/explore/fast/cover_1440.png 1440w,https://web.dev/static/explore/fast/cover_1920.png 1920w,https://web.dev/static/explore/fast/cover_2880.png 2880w" sizes="(max-width: 600px) 100vw, (max-width: 840px) 50vw, 342px" fetchpriority="high"> </picture> </figure> </div> <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="fast-load-times" data-text="Fast load times" class="hide-from-toc no-link" tabindex="0"> Fast load times </h3> <div class="devsite-landing-row-item-description-content"> Improve your site's performance. </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-4-up devsite-landing-row-cards devsite-landing-row-item-centered" background="grey" 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" background="white" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" background="grey" foreground="light-blue" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="what-is-speed" data-text="What is speed?" class="hide-from-toc no-link" tabindex="0"> What is speed? </h3> <div class="devsite-landing-row-item-buttons"> <a href="https://web.dev/articles/what-is-speed" class="button button-primary " >Read the doc</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" background="white" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" background="grey" foreground="light-blue" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="why-does-speed-matter" data-text="Why does speed matter?" class="hide-from-toc no-link" tabindex="0"> Why does speed matter? </h3> <div class="devsite-landing-row-item-buttons"> <a href="https://web.dev/learn/performance/why-speed-matters" class="button button-primary " >Read the doc</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" background="white" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" background="grey" foreground="light-blue" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="how-to-measure-speed" data-text="How to measure speed" class="hide-from-toc no-link" tabindex="0"> How to measure speed </h3> <div class="devsite-landing-row-item-buttons"> <a href="https://web.dev/articles/how-to-measure-speed" class="button button-primary " >Read the doc</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" background="white" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" background="grey" foreground="light-blue" size="medium" > <div class="devsite-landing-row-item-icon material-icons" aria-hidden="true"> article </div> </div> <div class="devsite-landing-row-item-body"> <h3 id="how-to-stay-fast" data-text="How to stay fast" class="hide-from-toc no-link" tabindex="0"> How to stay fast </h3> <div class="devsite-landing-row-item-buttons"> <a href="https://web.dev/articles/how-to-stay-fast" class="button button-primary " >Read the doc</a> </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 devsite-landing-row-padding-medium" 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://web.dev/static/learn/performance/card.png" srcset="https://web.dev/static/learn/performance/card_36.png 36w,https://web.dev/static/learn/performance/card_48.png 48w,https://web.dev/static/learn/performance/card_72.png 72w,https://web.dev/static/learn/performance/card_96.png 96w,https://web.dev/static/learn/performance/card_480.png 480w,https://web.dev/static/learn/performance/card_720.png 720w,https://web.dev/static/learn/performance/card_856.png 856w,https://web.dev/static/learn/performance/card_960.png 960w,https://web.dev/static/learn/performance/card_1440.png 1440w,https://web.dev/static/learn/performance/card_1920.png 1920w,https://web.dev/static/learn/performance/card_2880.png 2880w" 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.</p> <p>The initial release of this course focuses on web performance fundamentals, that beginners should find informative. Each module aims to demonstrate key performance concepts.</p> </div> <div class="devsite-landing-row-item-buttons"> <a href="https://web.dev/learn/performance" class="button button-primary " >Start learning <span class="material-icons icon-after" aria-hidden="true" translate="no">arrow_forward</span></a> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-3-up wd-explore-3up" header-position="left" > <div class="devsite-landing-row-inner"> <header class="devsite-landing-row-header" > <div class="devsite-landing-row-header-text"> <h2 id="overview" data-text="Overview" tabindex="0"> Overview </h2> <div class="devsite-landing-row-description"> <p>When building a modern web experience, it's important to measure, optimize, and monitor if you're to get fast and stay fast. Performance plays a significant role in the success of any online venture, as high performing sites engage and retain users better than poorly performing ones.</p><p>Sites should focus on optimizing for user-centric happiness metrics. Tools like Lighthouse (baked into web.dev!) highlight these metrics and help you take the right steps toward improving your performance. To stay fast, set and enforce performance budgets to help your team work within the constraints needed to continue loading fast and keeping users happy after your site has launched.</p> </div> </div> </header> <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="core-web-vitals" data-text="Core Web Vitals" class="hide-from-toc no-link" tabindex="0"> Core Web Vitals </h3> <ul class="devsite-landing-row-item-list"> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="web-vitals" data-text="Web Vitals" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/vitals"> Web Vitals </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="user-centric-performance-metrics" data-text="User-centric performance metrics" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/user-centric-performance-metrics"> User-centric performance metrics </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="defining-the-core-web-vitals-metrics-thresholds" data-text="Defining the Core Web Vitals metrics thresholds" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/defining-core-web-vitals-thresholds"> Defining the Core Web Vitals metrics thresholds </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="largest-contentful-paint-lcp" data-text="Largest Contentful Paint (LCP)" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/lcp"> Largest Contentful Paint (LCP) </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="cumulative-layout-shift-cls" data-text="Cumulative Layout Shift (CLS)" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/cls"> Cumulative Layout Shift (CLS) </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="interaction-to-next-paint-inp" data-text="Interaction to Next Paint (INP)" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/inp"> Interaction to Next Paint (INP) </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="optimize-largest-contentful-paint" data-text="Optimize Largest Contentful Paint" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/optimize-lcp"> Optimize Largest Contentful Paint </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="optimize-cumulative-layout-shift" data-text="Optimize Cumulative Layout Shift" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/optimize-cls"> Optimize Cumulative Layout Shift </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="optimize-interaction-to-next-paint" data-text="Optimize Interaction to Next Paint" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/optimize-inp"> Optimize Interaction to Next Paint </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="the-most-effective-ways-to-improve-core-web-vitals" data-text="The most effective ways to improve Core Web Vitals" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/top-cwv"> The most effective ways to improve Core Web Vitals </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="core-web-vitals-workflows-with-google-tools" data-text="Core Web Vitals workflows with Google tools" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/vitals-tools"> Core Web Vitals workflows with Google tools </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="optimizing-core-web-vitals-for-business-decision-makers" data-text="Optimizing Core Web Vitals for business decision makers" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/optimize-cwv-business"> Optimizing Core Web Vitals for business decision makers </a> </h4> </div> </div> </li> </ul> </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" > <div class="devsite-landing-row-item-body"> <h3 id="measure-performance-in-the-field" data-text="Measure performance in the field" class="hide-from-toc no-link" tabindex="0"> Measure performance in the field </h3> <ul class="devsite-landing-row-item-list"> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="using-the-chrome-ux-report-to-look-at-performance-in-the-field" data-text="Using the Chrome UX Report to look at performance in the field" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/chrome-ux-report"> Using the Chrome UX Report to look at performance in the field </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="why-lab-and-field-data-can-be-different-and-what-to-do-about-it" data-text="Why lab and field data can be different (and what to do about it)" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/lab-and-field-data-differences"> Why lab and field data can be different (and what to do about it) </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="why-is-crux-data-different-from-my-rum-data" data-text="Why is CrUX data different from my RUM data?" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/crux-and-rum-differences"> Why is CrUX data different from my RUM data? </a> </h4> </div> </div> </li> </ul> </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" > <div class="devsite-landing-row-item-body"> <h3 id="optimize-your-resource-delivery" data-text="Optimize your resource delivery" class="hide-from-toc no-link" tabindex="0"> Optimize your resource delivery </h3> <ul class="devsite-landing-row-item-list"> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="optimize-time-to-first-byte" data-text="Optimize Time to First Byte" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/optimize-ttfb"> Optimize Time to First Byte </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="content-delivery-networks-cdns" data-text="Content delivery networks (CDNs)" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/content-delivery-networks"> Content delivery networks (CDNs) </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="prioritize-resources" data-text="Prioritize resources" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/prioritize-resources"> Prioritize resources </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="preload-critical-assets-to-improve-loading-speed" data-text="Preload critical assets to improve loading speed" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/preload-critical-assets"> Preload critical assets to improve loading speed </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="establish-network-connections-early-to-improve-perceived-page-speed" data-text="Establish network connections early to improve perceived page speed" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/preconnect-and-dns-prefetch"> Establish network connections early to improve perceived page speed </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="prefetch-resources-to-speed-up-future-navigations" data-text="Prefetch resources to speed up future navigations" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/link-prefetch"> Prefetch resources to speed up future navigations </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="dont-fight-the-browser-preload-scanner" data-text="Don't fight the browser preload scanner" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/preload-scanner"> Don't fight the browser preload scanner </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="fast-playback-with-audio-and-video-preload" data-text="Fast playback with audio and video preload" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/fast-playback-with-preload"> Fast playback with audio and video preload </a> </h4> </div> </div> </li> </ul> </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" > <div class="devsite-landing-row-item-body"> <h3 id="optimize-your-images" data-text="Optimize your images" class="hide-from-toc no-link" tabindex="0"> Optimize your images </h3> <ul class="devsite-landing-row-item-list"> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="choose-the-right-image-format" data-text="Choose the right image format" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/choose-the-right-image-format"> Choose the right image format </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="choose-the-correct-level-of-compression" data-text="Choose the correct level of compression" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/compress-images"> Choose the correct level of compression </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="replace-animated-gifs-with-video-for-faster-page-loads" data-text="Replace animated GIFs with video for faster page loads" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/replace-gifs-with-videos"> Replace animated GIFs with video for faster page loads </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="serve-responsive-images" data-text="Serve responsive images" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/serve-responsive-images"> Serve responsive images </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="serve-images-with-correct-dimensions" data-text="Serve images with correct dimensions" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/serve-images-with-correct-dimensions"> Serve images with correct dimensions </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="use-image-cdns-to-optimize-images" data-text="Use image CDNs to optimize images" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/image-cdns"> Use image CDNs to optimize images </a> </h4> </div> </div> </li> </ul> </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" > <div class="devsite-landing-row-item-body"> <h3 id="lazy-load-images-and-video" data-text="Lazy-load images and video" class="hide-from-toc no-link" tabindex="0"> Lazy-load images and video </h3> <ul class="devsite-landing-row-item-list"> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="lazy-loading-video" data-text="Lazy loading video" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/lazy-loading-video"> Lazy loading video </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="browser-level-image-lazy-loading-for-the-web" data-text="Browser-level image lazy loading for the web" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/browser-level-image-lazy-loading"> Browser-level image lazy loading for the web </a> </h4> </div> </div> </li> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="the-performance-effects-of-too-much-lazy-loading" data-text="The performance effects of too much lazy loading" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/lcp-lazy-loading"> The performance effects of too much lazy loading </a> </h4> </div> </div> </li> </ul> </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" > <div class="devsite-landing-row-item-body"> <h3 id="optimize-web-fonts" data-text="Optimize web fonts" class="hide-from-toc no-link" tabindex="0"> Optimize web fonts </h3> <ul class="devsite-landing-row-item-list"> <li class="devsite-landing-row-item-list-item"> <div class="devsite-landing-row-item-list-item-content" > <div class="devsite-landing-row-item-list-item-description"> <h4 id="best-practices-for-fonts" data-text="Best practices for fonts" class=" no-link" tabindex="0"> <a href="https://web.dev/articles/font-best-practices"> Best practices for fonts </a> </h4> </div> </div> </li> </ul> </div> </div> </div> <div class="devsite-landing-row-item 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