Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
developer.apple.com/assets/elements/icons/sdk-27/sdk-27-256x256_2x.png	600.0 s	986.7 KiB
developer.apple.com/home/images/tile-tvos-27/tvos-27-large_2x.webp	600.0 s	271.0 KiB
developer.apple.com/home/images/media-gallery/tile-sept26-event/small_2x.png?1	600.0 s	247.4 KiB
developer.apple.com/home/images/tile-ipados-27/ipados-27-large_2x.webp	600.0 s	242.0 KiB
www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_semibold.woff2	408.0 s	230.0 KiB
developer.apple.com/home/images/tile-macos-27/macos-27-large_2x.webp	600.0 s	213.7 KiB
www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_medium.woff2	3283.0 s	230.4 KiB
www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_regular.woff2	3289.0 s	216.6 KiB
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	600.0 s	170.7 KiB
developer.apple.com/home/images/media-gallery/tile-100sessions/small_2x.jpg	600.0 s	155.6 KiB
/assets/elements/icons/xcode-s-dark/xcode-s-dark-256x256_...	600.0 s	155.4 KiB
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	600.0 s	142.7 KiB
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	600.0 s	135.4 KiB
developer.apple.com/home/images/tile-ios-27/ios-27-large_2x.webp	600.0 s	130.1 KiB
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	600.0 s	119.9 KiB
www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_semibold.woff2	2934.0 s	127.7 KiB
www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_bold.woff2	3300.0 s	126.2 KiB
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	600.0 s	106.5 KiB
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	600.0 s	104.3 KiB
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	600.0 s	102.4 KiB
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	600.0 s	102.3 KiB
www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_regular.woff2	3298.0 s	115.5 KiB
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	600.0 s	101.3 KiB
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	600.0 s	98.8 KiB
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	600.0 s	98.6 KiB
developer.apple.com/home/images/tile-visionos-27/visionos-27-large_2x.webp	600.0 s	97.8 KiB
developer.apple.com/home/images/media-gallery/tile-xcode27beta/small_2x.jpg	600.0 s	90.9 KiB
developer.apple.com/assets/styles/global.dist.css?19212626191	600.0 s	83.4 KiB
developer.apple.com/home/images/tile-watchos-27/watchos-27-large_2x.webp	600.0 s	82.0 KiB
developer.apple.com/home/images/media-gallery/tile-whatsnew/small_2x.jpg	600.0 s	49.6 KiB
developer.apple.com/home/images/media-gallery/tile-search/small_2x.jpg	600.0 s	37.9 KiB
developer.apple.com/assets/scripts/lib/jquery/jquery-3.6.0.min.js?35212621148	600.0 s	31.6 KiB
developer.apple.com/assets/metrics/scripts/analytics.js	600.0 s	28.4 KiB
developer.apple.com/assets/styles/globalnav.css?34212621148	600.0 s	14.0 KiB
www.apple.com/wss/fonts/SF-Pro-Icons/v3/sf-pro-icons_regular.woff2	2254.0 s	15.0 KiB
www.apple.com/wss/fonts/SF-Pro-Icons/v3/sf-pro-icons_semibold.woff2	3290.0 s	15.4 KiB
developer.apple.com/assets/styles/dark-mode.css?34212621148	600.0 s	10.6 KiB
developer.apple.com/assets/includes/global-session-nav/session.js	600.0 s	8.0 KiB
developer.apple.com/home/scripts/home-alt.js?1	600.0 s	7.8 KiB
developer.apple.com/home/styles/home-alt.css?581526122041	600.0 s	6.2 KiB
developer.apple.com/assets/scripts/media-card-infinite.js?2	600.0 s	5.9 KiB
developer.apple.com/assets/styles/media-card-infinite.css?581526122041	600.0 s	5.4 KiB
developer.apple.com/assets/styles/footer.dist.css?34212621148	600.0 s	5.3 KiB
/assets/elements/icons/brandmark/apple-developer-brandmar...	600.0 s	5.0 KiB
developer.apple.com/assets/scripts/color-scheme-toggle.js	600.0 s	4.5 KiB
developer.apple.com/assets/scripts/ac-globalnav.built.js?35212621148	600.0 s	4.3 KiB
developer.apple.com/assets/scripts/suggest-lang.js?50222638203	600.0 s	3.5 KiB
developer.apple.com/home/styles/personalized.css?581526122041	600.0 s	3.4 KiB
developer.apple.com/assets/includes/global-session-nav/session.css	600.0 s	3.4 KiB
developer.apple.com/assets/styles/sc-gallery.css?342126211481	600.0 s	3.3 KiB
developer.apple.com/assets/metrics/scripts/analytics-module.js?35212621148	600.0 s	2.8 KiB
developer.apple.com/assets/scripts/language-dropdown.js?56212607203	600.0 s	2.7 KiB
developer.apple.com/assets/scripts/date-formatter.js	600.0 s	2.7 KiB
developer.apple.com/assets/elements/icons/symbols/person-3.svg	600.0 s	2.7 KiB
developer.apple.com/assets/styles/localization.css?34212621148	600.0 s	2.7 KiB
developer.apple.com/assets/scripts/DeveloperBreadcrumbs.js?35212621148	600.0 s	2.5 KiB
developer.apple.com/assets/scripts/retinate.js?35212621148	600.0 s	2.5 KiB
developer.apple.com/assets/scripts/getPersonalizedContent.js	600.0 s	2.4 KiB
developer.apple.com/assets/scripts/sc-gallery.js?1	600.0 s	2.4 KiB
developer.apple.com/assets/scripts/global-logout.js?35212621148	600.0 s	2.2 KiB
developer.apple.com/assets/styles/suggest-lang.css?34212621148	600.0 s	2.1 KiB
developer.apple.com/assets/scripts/settings.js?35212621148	600.0 s	2.1 KiB
developer.apple.com/assets/scripts/getUserProfile.js	600.0 s	2.0 KiB
developer.apple.com/assets/scripts/language-locales.js?50222638203	600.0 s	1.9 KiB
developer.apple.com/assets/styles/language-dropdown.css?35212621148	600.0 s	1.9 KiB
www.apple.com/wss/fonts?families=SF+Pro,v3\|SF+Pro+Icons,v3	3278.0 s	2.1 KiB
www.apple.com/wss/fonts?family=SF+Mono&v=2	3546.0 s	1.5 KiB
www.apple.com/wss/fonts?family=Apple+Icons&v=1	2909.0 s	1.4 KiB

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
a.tile-link > div.tile > div.tile-content > img.center `a.tile-link > div.tile > div.tile-content > img.center`	developer.apple.com/assets/elements/icons/sdk-27/sdk-27-256x256_2x.png	985.4 KiB	982.0 KiB
tvOS 27 on Apple TV `a.tile-link > div.tile > picture > img.os-image`	developer.apple.com/home/images/tile-tvos-27/tvos-27-large_2x.webp	269.6 KiB	261.6 KiB
iPadOS 27 on iPad `a.tile-link > div.tile > picture > img.os-image`	developer.apple.com/home/images/tile-ipados-27/ipados-27-large_2x.webp	240.7 KiB	236.4 KiB
div.card > div.media-block > picture.positioned-media-element > img `div.card > div.media-block > picture.positioned-media-element > img`	developer.apple.com/home/images/media-gallery/tile-sept26-event/small_2x.png?1	246.1 KiB	211.9 KiB
macOS 27 on Mac `a.tile-link > div.tile > picture > img.os-image`	developer.apple.com/home/images/tile-macos-27/macos-27-large_2x.webp	212.3 KiB	209.0 KiB
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	170.2 KiB	161.4 KiB
a.tile-link > div.tile > div.tile-content > img.center `a.tile-link > div.tile > div.tile-content > img.center`	/assets/elements/icons/xcode-s-dark/xcode-s-dark-256x256_...	154.0 KiB	147.5 KiB
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	142.2 KiB	133.4 KiB
iOS 27 on iPhone `a.tile-link > div.tile > picture > img.os-image`	developer.apple.com/home/images/tile-ios-27/ios-27-large_2x.webp	128.8 KiB	121.1 KiB
div.card > div.media-block > picture.positioned-media-element > img `div.card > div.media-block > picture.positioned-media-element > img`	developer.apple.com/home/images/media-gallery/tile-100sessions/small_2x.jpg	154.2 KiB	120.0 KiB
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	119.4 KiB	110.6 KiB
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	106.0 KiB	97.2 KiB
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	100.8 KiB	92.0 KiB
visionOS 27 on Apple Vision Pro `a.tile-link > div.tile > picture > img.os-image`	developer.apple.com/home/images/tile-visionos-27/visionos-27-large_2x.webp	96.4 KiB	90.4 KiB
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	98.3 KiB	89.5 KiB
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	98.1 KiB	89.3 KiB
watchOS 27 on Apple Watch `a.tile-link > div.tile > picture > img.os-image`	developer.apple.com/home/images/tile-watchos-27/watchos-27-large_2x.webp	80.6 KiB	71.3 KiB
div.card > div.media-block > picture.positioned-media-element > img `div.card > div.media-block > picture.positioned-media-element > img`	developer.apple.com/home/images/media-gallery/tile-xcode27beta/small_2x.jpg	89.6 KiB	55.4 KiB
div.card > div.media-block > picture.positioned-media-element > img `div.card > div.media-block > picture.positioned-media-element > img`	developer.apple.com/home/images/media-gallery/tile-whatsnew/small_2x.jpg	48.2 KiB	29.5 KiB
div.card > div.media-block > picture.positioned-media-element > img `div.card > div.media-block > picture.positioned-media-element > img`	developer.apple.com/home/images/media-gallery/tile-search/small_2x.jpg	36.6 KiB	22.4 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-20-IMG

nodeLabel: div.card > div.media-block > picture.positioned-media-element > img

path: 1,HTML,1,BODY,13,MAIN,1,SECTION,0,DIV,0,DIV,0,DIV,0,UL,4,LI,0,DIV,0,DIV,2,PICTURE,2,IMG

selector: div.card > div.media-block > picture.positioned-media-element > img

snippet: <img src="https://developer.apple.com/home/images/media-gallery/tile-sept26-event/sm…" alt="">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
developer.apple.com/	http/1.1
developer.apple.com/assets/styles/global.dist.css?19212626191	http/1.1
developer.apple.com/assets/styles/localization.css?34212621148	http/1.1
developer.apple.com/assets/scripts/lib/jquery/jquery-3.6.0.min.js?35212621148	http/1.1
developer.apple.com/assets/scripts/settings.js?35212621148	http/1.1
developer.apple.com/assets/scripts/language-locales.js?50222638203	http/1.1
developer.apple.com/assets/scripts/DeveloperBreadcrumbs.js?35212621148	http/1.1
developer.apple.com/assets/metrics/scripts/analytics-module.js?35212621148	http/1.1
developer.apple.com/assets/scripts/retinate.js?35212621148	http/1.1
developer.apple.com/assets/scripts/global-logout.js?35212621148	http/1.1
developer.apple.com/assets/includes/global-session-nav/session.css	http/1.1
developer.apple.com/assets/includes/global-session-nav/session.js	http/1.1
www.apple.com/wss/fonts?families=SF+Pro,v3\|SF+Pro+Icons,v3	http/1.1
www.apple.com/wss/fonts?family=SF+Mono&v=2	http/1.1
www.apple.com/wss/fonts?family=Apple+Icons&v=1	http/1.1
developer.apple.com/home/styles/home-alt.css?581526122041	http/1.1
developer.apple.com/home/styles/personalized.css?581526122041	http/1.1
developer.apple.com/assets/styles/sc-gallery.css?342126211481	http/1.1
developer.apple.com/assets/styles/media-card-infinite.css?581526122041	http/1.1
developer.apple.com/assets/scripts/media-card-infinite.js?2	http/1.1
developer.apple.com/assets/styles/suggest-lang.css?34212621148	http/1.1
developer.apple.com/assets/scripts/suggest-lang.js?50222638203	http/1.1
developer.apple.com/assets/styles/globalnav.css?34212621148	http/1.1
developer.apple.com/assets/scripts/ac-globalnav.built.js?35212621148	http/1.1
developer.apple.com/assets/metrics/scripts/analytics.js	http/1.1
developer.apple.com/home/images/media-gallery/tile-sept26-event/small_2x.png?1	http/1.1
developer.apple.com/home/images/media-gallery/tile-xcode27beta/small_2x.jpg	http/1.1
developer.apple.com/home/images/media-gallery/tile-whatsnew/small_2x.jpg	http/1.1
developer.apple.com/home/images/media-gallery/tile-100sessions/small_2x.jpg	http/1.1
developer.apple.com/home/images/media-gallery/tile-search/small_2x.jpg	http/1.1
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	http/1.1
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	http/1.1
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	http/1.1
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	http/1.1
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	http/1.1
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	http/1.1
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	http/1.1
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	http/1.1
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	http/1.1
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	http/1.1
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	http/1.1
/assets/elements/icons/xcode-s-dark/xcode-s-dark-256x256_...	http/1.1
developer.apple.com/home/images/tile-ios-27/ios-27-large_2x.webp	http/1.1
developer.apple.com/home/images/tile-ipados-27/ipados-27-large_2x.webp	http/1.1
developer.apple.com/home/images/tile-macos-27/macos-27-large_2x.webp	http/1.1
developer.apple.com/home/images/tile-tvos-27/tvos-27-large_2x.webp	http/1.1
developer.apple.com/home/images/tile-visionos-27/visionos-27-large_2x.webp	http/1.1
developer.apple.com/home/images/tile-watchos-27/watchos-27-large_2x.webp	http/1.1
developer.apple.com/assets/elements/icons/sdk-27/sdk-27-256x256_2x.png	http/1.1
developer.apple.com/assets/elements/icons/symbols/person-3.svg	http/1.1
developer.apple.com/assets/styles/footer.dist.css?34212621148	http/1.1
developer.apple.com/assets/scripts/color-scheme-toggle.js	http/1.1
developer.apple.com/assets/styles/language-dropdown.css?35212621148	http/1.1
developer.apple.com/assets/scripts/language-dropdown.js?56212607203	http/1.1
developer.apple.com/assets/scripts/sc-gallery.js?1	http/1.1
developer.apple.com/home/scripts/home-alt.js?1	http/1.1
developer.apple.com/assets/styles/dark-mode.css?34212621148	http/1.1
/assets/elements/icons/brandmark/apple-developer-brandmar...	http/1.1
www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_semibold.woff2	http/1.1
www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_regular.woff2	http/1.1
www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_semibold.woff2	http/1.1
www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_bold.woff2	http/1.1
www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_regular.woff2	http/1.1
developer.apple.com/assets/scripts/getPersonalizedContent.js	http/1.1
developer.apple.com/assets/scripts/getUserProfile.js	http/1.1
developer.apple.com/assets/scripts/date-formatter.js	http/1.1
developer.apple.com/services-session/v1/info	http/1.1
developer.apple.com/api/v1/content/catalog/	http/1.1
developer.apple.com/services-public/event/developer/eventList	http/1.1
www.apple.com/wss/fonts/SF-Pro-Icons/v3/sf-pro-icons_regular.woff2	http/1.1
www.apple.com/wss/fonts/SF-Pro-Icons/v3/sf-pro-icons_semibold.woff2	http/1.1
developer.apple.com/favicon.ico	http/1.1
www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_medium.woff2	http/1.1

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
www.apple.com/wss/fonts?families=SF+Pro,v3\|SF+Pro+Icons,v3	2.1 KiB	755 ms
www.apple.com/wss/fonts?family=Apple+Icons&v=1	1.4 KiB	755 ms
www.apple.com/wss/fonts?family=SF+Mono&v=2	1.5 KiB	755 ms
developer.apple.com/assets/metrics/scripts/analytics.js	28.4 KiB	905 ms
developer.apple.com/assets/scripts/ac-globalnav.built.js?35212621148	4.3 KiB	305 ms
developer.apple.com/assets/scripts/global-logout.js?35212621148	2.2 KiB	155 ms
developer.apple.com/assets/scripts/DeveloperBreadcrumbs.js?35212621148	2.5 KiB	155 ms
developer.apple.com/assets/metrics/scripts/analytics-module.js?35212621148	2.8 KiB	155 ms
developer.apple.com/assets/scripts/settings.js?35212621148	2.1 KiB	155 ms
developer.apple.com/assets/scripts/language-locales.js?50222638203	1.9 KiB	155 ms
developer.apple.com/assets/scripts/suggest-lang.js?50222638203	3.5 KiB	305 ms
developer.apple.com/assets/scripts/lib/jquery/jquery-3.6.0.min.js?35212621148	31.6 KiB	1.5 s
developer.apple.com/assets/styles/global.dist.css?19212626191	83.4 KiB	2.9 s
developer.apple.com/assets/styles/media-card-infinite.css?581526122041	5.4 KiB	305 ms
developer.apple.com/assets/styles/globalnav.css?34212621148	14.0 KiB	755 ms
developer.apple.com/home/styles/home-alt.css?581526122041	6.2 KiB	755 ms
developer.apple.com/assets/styles/suggest-lang.css?34212621148	2.1 KiB	155 ms
developer.apple.com/assets/styles/sc-gallery.css?342126211481	3.3 KiB	605 ms
developer.apple.com/assets/includes/global-session-nav/session.css	3.4 KiB	605 ms
developer.apple.com/assets/styles/localization.css?34212621148	2.7 KiB	455 ms
developer.apple.com/home/styles/personalized.css?581526122041	3.4 KiB	605 ms

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_regular.woff2	15 ms
www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_semibold.woff2	10 ms
www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_regular.woff2	10 ms
www.apple.com/wss/fonts/SF-Pro-Icons/v3/sf-pro-icons_semibold.woff2	10 ms
www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_semibold.woff2	5.0 ms
www.apple.com/wss/fonts/SF-Pro-Display/v3/sf-pro-display_bold.woff2	5.0 ms
www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_medium.woff2	5.0 ms

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 11.6 KiB

URL	Transfer Size	Est Savings
developer.apple.com/assets/metrics/scripts/analytics.js	27.0 KiB	8.8 KiB
developer.apple.com/assets/includes/global-session-nav/session.js	6.6 KiB	2.9 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 160 ms 89.7 KiB

URL	Transfer Size	Est Savings
developer.apple.com/assets/styles/global.dist.css?19212626191	82.1 KiB	79.6 KiB
developer.apple.com/assets/styles/globalnav.css?34212621148	12.6 KiB	10.0 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 10 ms 21.8 KiB

URL	Transfer Size	Est Savings
developer.apple.com/assets/scripts/lib/jquery/jquery-3.6.0.min.js?35212621148	30.2 KiB	21.8 KiB

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.2 KiB

URL	Transfer Size	Est Savings
developer.apple.com/assets/styles/globalnav.css?34212621148	14.0 KiB	2.2 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
developer.apple.com/api/v1/content/catalog/	1.1 MiB
developer.apple.com/assets/elements/icons/sdk-27/sdk-27-256x256_2x.png	986.7 KiB
developer.apple.com/home/images/tile-tvos-27/tvos-27-large_2x.webp	271.0 KiB
developer.apple.com/home/images/media-gallery/tile-sept26-event/small_2x.png?1	247.4 KiB
developer.apple.com/home/images/tile-ipados-27/ipados-27-large_2x.webp	242.0 KiB
www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_medium.woff2	230.4 KiB
www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_semibold.woff2	230.0 KiB
www.apple.com/wss/fonts/SF-Pro-Text/v3/sf-pro-text_regular.woff2	216.6 KiB
developer.apple.com/home/images/tile-macos-27/macos-27-large_2x.webp	213.7 KiB
/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...	170.7 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
developer.apple.com/	5.7 s	61 ms	2.4 ms
developer.apple.com/assets/scripts/media-card-infinite.js?2	4.9 s	1.2 s	0.2 ms
Unattributable	1.4 s	6.5 ms	0.0 ms
developer.apple.com/assets/metrics/scripts/analytics.js	90 ms	12 ms	5.8 ms
developer.apple.com/assets/scripts/lib/jquery/jquery-3.6.0.min.js?35212621148	56 ms	36 ms	8.5 ms
developer.apple.com/assets/styles/global.dist.css?19212626191	50 ms	0.0 ms	0.0 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Style & Layout	5.4 s
Other	4.0 s
Script Evaluation	1.4 s
Rendering	1.2 s
Garbage Collection	148 ms
Parse HTML & CSS	106 ms
Script Parsing & Compilation	26 ms

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...
li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img `li.sc-gallery__item > a.sc-gallery__card > div.tile-video > img`	/wwdc-services/images/9B2E82C5-4DDF-4B9A-9459-328D8E29769...
tvOS 27 on Apple TV `a.tile-link > div.tile > picture > img.os-image`	developer.apple.com/home/images/tile-tvos-27/tvos-27-large_2x.webp
macOS 27 on Mac `a.tile-link > div.tile > picture > img.os-image`	developer.apple.com/home/images/tile-macos-27/macos-27-large_2x.webp
visionOS 27 on Apple Vision Pro `a.tile-link > div.tile > picture > img.os-image`	developer.apple.com/home/images/tile-visionos-27/visionos-27-large_2x.webp
div.section-content > div.row > div.column > img.filter-w `div.section-content > div.row > div.column > img.filter-w`	developer.apple.com/assets/elements/icons/symbols/person-3.svg
iPadOS 27 on iPad `a.tile-link > div.tile > picture > img.os-image`	developer.apple.com/home/images/tile-ipados-27/ipados-27-large_2x.webp

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Optimize viewport for mobile

●Max Potential First Input Delay 50 ms

●Avoid long main-thread tasks 6 long tasks found

●Avoid non-composited animations 37 animated elements found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 20 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 0 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○User Timing marks and measures

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

ARIA

Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Download now Xcode 27 beta Bring your ideas to life faster using coding agents… `div#media-card-gallery > div.media-gallery-wrapper > div.gallery > ul.card-set`

ARIA roles must have valid values in order to perform their intended accessibility functions. Learn more about valid ARIA roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Download now Xcode 27 beta Bring your ideas to life faster using coding agents… `section#priority-router > div#media-card-gallery > div.media-gallery-wrapper > div.gallery`

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
September 8-9, 2026 · Online appointment `ul.sc-gallery__card-set > li.sc-gallery__item > a.sc-gallery__card > p.pc-card__gl-datetime`
September 10-11, 2026 · Online appointment `ul.sc-gallery__card-set > li.sc-gallery__item > a.sc-gallery__card > p.pc-card__gl-datetime`
September 15-16, 2026 · Online appointment `ul.sc-gallery__card-set > li.sc-gallery__item > a.sc-gallery__card > p.pc-card__gl-datetime`
September 17-18, 2026 · Online appointment `ul.sc-gallery__card-set > li.sc-gallery__item > a.sc-gallery__card > p.pc-card__gl-datetime`
September 23, 2026 · Online appointment `ul.sc-gallery__card-set > li.sc-gallery__item > a.sc-gallery__card > p.pc-card__gl-datetime`
October 7, 2026 · Online session `ul.sc-gallery__card-set > li.sc-gallery__item > a.sc-gallery__card > p.pc-card__gl-datetime`
October 7-8, 2026 · In-person session `ul.sc-gallery__card-set > li.sc-gallery__item > a.sc-gallery__card > p.pc-card__gl-datetime`
October 7, 2026 · Online appointment `ul.sc-gallery__card-set > li.sc-gallery__item > a.sc-gallery__card > p.pc-card__gl-datetime`
October 19, 2026 · Online appointment `ul.sc-gallery__card-set > li.sc-gallery__item > a.sc-gallery__card > p.pc-card__gl-datetime`
October 29, 2026 · Online session `ul.sc-gallery__card-set > li.sc-gallery__item > a.sc-gallery__card > p.pc-card__gl-datetime`
Read the latest news. Get the Apple Developer app. Follow us on bilibili, Linke… `div.footer-content > section.footer-mini > div.footer-mini-news > div.copy`
Read the latest news. `section.footer-mini > div.footer-mini-news > div.copy > div.footer-mini-legal-link`
Get the Apple Developer app. `section.footer-mini > div.footer-mini-news > div.copy > div.footer-mini-legal-link`
Light `div.content > div.color-scheme-toggle > label > div.text`
Dark `div.content > div.color-scheme-toggle > label > div.text`
Copyright © 2026 Apple Inc. All rights reserved. `div.footer-content > section.footer-mini > div.footer-mini-legal > div.footer-mini-legal-copyright`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Apple Inc. `section.footer-mini > div.footer-mini-legal > div.footer-mini-legal-copyright > a`

These are opportunities to improve the legibility of your content.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
App Review appointment `li.sc-gallery__item > a.sc-gallery__card > div.pc-card__gl-top > h5.pc-card__title`
Join the Apple Developer Program to reach customers around the world on the App… `div.section-content > div.row > div.column > h5.subhead`

These are opportunities to improve keyboard navigation in your application.

Names and labels

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
main.main > section.section > div.unit-wrapper > a.unit-link `main.main > section.section > div.unit-wrapper > a.unit-link`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Privacy Policy `section.footer-mini > div.footer-mini-legal > div.footer-mini-legal-links > a.footer-mini-legal-link`

These items highlight common accessibility best practices.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Try it now `div.caption-container > div.caption-container-inner > div.media-card-gallery-ctas > a.button`

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]`s are contained by their required parent element

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●Select elements have associated label elements.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●`[lang]` attributes have a valid value

●`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Image elements do not have `[alt]` attributes that are redundant text.

○Identical links have the same purpose.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source	Description
developer.apple.com/services-session/v1/info	`Failed to load resource: the server responded with a status of 401 (Unauthorized)`
developer.apple.com/services-session/v1/info	`Failed to load resource: the server responded with a status of 401 (Unauthorized)`

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
www.apple.com/apple-events/	Learn more
www.apple.com/apple-events/	Learn more

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`