Lighthouse Mobile
· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.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.
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
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.
Performance issues directly impact user engagement and conversion rates.
Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.
Performance issues directly impact user engagement and conversion rates.
Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.
Performance issues directly impact user engagement and conversion rates.
A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.
Performance issues directly impact user engagement and conversion rates.
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
body > div#google_image_div > a#aw0 > img.img_ad body > div#google_image_div > a#aw0 > img.img_ad | tpc.googlesyndication.com/simgad/17305951147302659319 | 27.5 KiB | 24.8 KiB |
The Black Church ul#splide05-list > li#splide05-slide01 > a.ShowPoster-module-scss-module__nhmUXq__show_poster__link > img | /contentchannels/qkJ22cN-show-poster2x3-IR4c3y5.jpg?forma... | 36.3 KiB | 21.1 KiB |
Hemingway ul#splide05-list > li#splide05-slide04 > a.ShowPoster-module-scss-module__nhmUXq__show_poster__link > img | /contentchannels/n8LSv1u-show-poster2x3-TdXlueR.jpg?forma... | 28.9 KiB | 13.7 KiB |
Battles of the American Revolution li#splide03-slide01 > div.FeaturedNewsThumbnail-module-scss-module__NgWMRG__featured_news_thumbnail_wrapper > a > img.FeaturedNewsThumbnail-module-scss-module__NgWMRG__featured_news_thumbnail_image | image.pbs.org/curate/battle-map-thumbnail-o04j7h.jpg?format=avif&resize=250x141 | 15.9 KiB | 10.2 KiB |
Subcultured ul#splide05-list > li#splide05-slide03 > a.ShowPoster-module-scss-module__nhmUXq__show_poster__link > img | /contentchannels/s1lO48Z-show-poster2x3-V6gBIDl.png?forma... | 23.7 KiB | 8.6 KiB |
Happiness: Everything You Need to Know li#splide03-slide02 > div.FeaturedNewsThumbnail-module-scss-module__NgWMRG__featured_news_thumbnail_wrapper > a > img.FeaturedNewsThumbnail-module-scss-module__NgWMRG__featured_news_thumbnail_image | image.pbs.org/curate/happiness-f9xoay.jpg?format=avif&resize=250x141 | 13.6 KiB | 7.9 KiB |
Hungary’s Magyar Wants To Take Over As Prime Minister May 5 li#splide02-slide03 > div.LatestNewsThumbnail-module-scss-module__Xdv-3q__latest_news_thumbnail_wrapper > a.LatestNewsThumbnail-module-scss-module__Xdv-3q__latest_news_thumbnail > img.LatestNewsThumbnail-module-scss-module__Xdv-3q__latest_news_thumbnail_image | image.pbs.org/curate/hungary-v4e5wz.jpg?format=avif&crop=390x220 | 21.0 KiB | 7.0 KiB |
Muhammad Ali ul#splide04-list > li#splide04-slide03 > a.ShowPoster-module-scss-module__nhmUXq__show_poster__link > img | /contentchannels/ObiHToF-show-poster2x3-BN5GGgv.jpg?forma... | 21.4 KiB | 6.3 KiB |
The U.S. and the Holocaust ul#splide04-list > li#splide04-slide02 > a.ShowPoster-module-scss-module__nhmUXq__show_poster__link > img | /contentchannels/CfrrjS4-show-poster2x3-d9mwxtG.jpg?forma... | 20.6 KiB | 5.4 KiB |
What To Know About Trump’s Tax Breaks for Tips and Overtime li#splide02-slide01 > div.LatestNewsThumbnail-module-scss-module__Xdv-3q__latest_news_thumbnail_wrapper > a.LatestNewsThumbnail-module-scss-module__Xdv-3q__latest_news_thumbnail > img.LatestNewsThumbnail-module-scss-module__Xdv-3q__latest_news_thumbnail_image | image.pbs.org/curate/taxes-ooyv9x.jpg?format=avif&crop=390x220 | 19.2 KiB | 5.2 KiB |
div.PageTransition-module-scss-module__3E4t1q__page_transition > div.Newsletter-module-scss-module__quCLyG__newsletter > picture.Newsletter-module-scss-module__quCLyG__background > img div.PageTransition-module-scss-module__3E4t1q__page_transition > div.Newsletter-module-scss-module__quCLyG__newsletter > picture.Newsletter-module-scss-module__quCLyG__background > img | www.pbs.org/images/newsletter/general/newsletter-signup-background_375@2x.avif | 42.4 KiB | 4.7 KiB |
What is Art in the Twenty-First Century? li#splide03-slide03 > div.FeaturedNewsThumbnail-module-scss-module__NgWMRG__featured_news_thumbnail_wrapper > a > img.FeaturedNewsThumbnail-module-scss-module__NgWMRG__featured_news_thumbnail_image | image.pbs.org/curate/art21-gyk7cq.jpg?format=avif&resize=250x141 | 10.3 KiB | 4.6 KiB |
Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.
Performance issues directly impact user engagement and conversion rates.
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Performance issues directly impact user engagement and conversion rates.
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.
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.
Performance issues directly impact user engagement and conversion rates.
| Request | Cache TTL | Transfer Size |
|---|---|---|
| cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js | 1200.0 s | 257.5 KiB |
| /pagead/managed/js/activeview/current/ufs_web_display.js | 3600.0 s | 73.1 KiB |
| global.ketchcdn.com/web/v3/config/pbs/website_smart_tag/boot.js | 1200.0 s | 4.7 KiB |
| /pagead/js/r20260420/r20110914/client/window_focus_fy2021.js | 1209600.0 s | 1.6 KiB |
These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.
Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.
Performance issues directly impact user engagement and conversion rates.
| URL | Time Spent |
|---|---|
| pbs.org/ | 1.5 s |
| www.pbs.org/ | 0.0 ms |
These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS
Performance issues directly impact user engagement and conversion rates.
| Element | Layout shift score |
|---|---|
body body | 1.000 |
Continue Watching
Dive back in right where you left off.
Sign In to Access body > main#maincontent > div.PageTransition-module-scss-module__3E4t1q__page_transition > div.SignedOutContinueWatching-module-scss-module__QM48qa__signed_out_continue_watching | 0.023 |
The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
Diagnostics
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| 22.1 KiB | 22.1 KiB | |
| www.pbs.org/_next/static/chunks/0hl59ti7b81wd.css | 12.5 KiB | 12.4 KiB |
| www.pbs.org/_next/static/chunks/0f3_~aw_l8mhy.css | 13.2 KiB | 11.8 KiB |
| www.pbs.org/_next/static/chunks/0brysxoqq8n3i.css | 12.3 KiB | 11.5 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js | 257.0 KiB | 155.6 KiB |
| /pagead/managed/js/gpt/m202604090101/pubads_impl.js?cb=31... | 185.9 KiB | 96.2 KiB |
| www.googletagmanager.com/gtag/js?id=G-QCNNW9XL0J&l=GTMDataLayer&cx=c>m=4e64h1 | 171.2 KiB | 66.8 KiB |
| www.googletagmanager.com/gtm.js?id=GTM-TWTDGH&l=GTMDataLayer | 152.2 KiB | 55.5 KiB |
| /pagead/managed/js/activeview/current/ufs_web_display.js | 73.1 KiB | 30.3 KiB |
| www.pbs.org/_next/static/chunks/0s2nm2ovzd~eb.js | 70.2 KiB | 24.4 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Total CPU Time | Script Evaluation | Script Parse |
|---|---|---|---|
| www.pbs.org/_next/static/chunks/0s2nm2ovzd~eb.js | 2.1 s | 1.4 s | 33 ms |
| Unattributable | 1.1 s | 124 ms | 0.0 ms |
| /pagead/managed/js/gpt/m202604090101/pubads_impl.js?cb=31... | 800 ms | 517 ms | 108 ms |
| www.pbs.org/ | 733 ms | 37 ms | 29 ms |
| cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js | 653 ms | 437 ms | 213 ms |
| www.googletagmanager.com/gtm.js?id=GTM-TWTDGH&l=GTMDataLayer | 426 ms | 316 ms | 78 ms |
| www.googletagmanager.com/gtag/js?id=G-QCNNW9XL0J&l=GTMDataLayer&cx=c>m=4e64h1 | 384 ms | 309 ms | 69 ms |
| www.pbs.org/_next/static/chunks/01-omjevdmk4c.js | 352 ms | 303 ms | 20 ms |
| /pagead/managed/js/activeview/current/ufs_web_display.js | 339 ms | 298 ms | 32 ms |
| www.pbs.org/_next/static/chunks/161x_6-equb._.js | 141 ms | 19 ms | 11 ms |
| securepubads.g.doubleclick.net/tag/js/gpt.js | 125 ms | 109 ms | 15 ms |
| ep2.adtrafficquality.google/sodar/sodar2.js | 58 ms | 51 ms | 3.1 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
Performance issues directly impact user engagement and conversion rates.
| Category | Time Spent |
|---|---|
| Script Evaluation | 4.0 s |
| Other | 1.2 s |
| Style & Layout | 1.2 s |
| Script Parsing & Compilation | 689 ms |
| Parse HTML & CSS | 140 ms |
| Rendering | 130 ms |
| Garbage Collection | 109 ms |
Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache
Performance issues directly impact user engagement and conversion rates.
| Failure reason | Failure type |
|---|---|
| Pages with cache-control:no-store header cannot enter back/forward cache. | Actionable |
| Pages whose main resource has cache-control:no-store cannot enter back/forward cache. | Not actionable |
| Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header. | Not actionable |
More information about the performance of your application. These numbers don't directly affect the Performance score.
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.
Best Practices
General
Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.
Performance issues directly impact user engagement and conversion rates.
| Deprecation / Warning | Source |
|---|---|
| SharedStorage | /pagead/managed/js/activeview/current/ufs_web_display.js line 252, col 234 |
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
Performance issues directly impact user engagement and conversion rates.
| Source | Description |
|---|---|
/pagead/managed/js/gpt/m202604090101/pubads_impl.js?cb=31... line 18, col 380265 | Loading the script 'https://ads.pubmatic.com/AdServer/js/google-esp.js' violates the following Content Security Policy directive: "script-src 'self' 'unsafe-eval' 'unsafe-inline' *.pbs.org *.googlesyndication.com *.adtrafficquality.google adservice.google.com adservice.google.co.in connect.facebook.net fundingchoicesmessages.google.com *.2mdn.net *.nr-data.net sb.scorecardresearch.com securepubads.g.doubleclick.net www.google-analytics.com analytics.google.com www.googletagmanager.com *.googletagservices.com 'unsafe-inline' 'unsafe-eval' *.cookielaw.org www.redditstatic.com alb.reddit.com analytics.tiktok.com s.pinimg.com *.ketchcdn.com *.ketchjs.com static.cloudflareinsights.com". Note that 'script-src-elem' was not explicitly set, so 'script-src' is used as a fallback. The action has been blocked. |
/pagead/managed/js/gpt/m202604090101/pubads_impl.js?cb=31... line 18, col 380265 | Loading the script 'https://connectid.analytics.yahoo.com/connectId-gpt.js' violates the following Content Security Policy directive: "script-src 'self' 'unsafe-eval' 'unsafe-inline' *.pbs.org *.googlesyndication.com *.adtrafficquality.google adservice.google.com adservice.google.co.in connect.facebook.net fundingchoicesmessages.google.com *.2mdn.net *.nr-data.net sb.scorecardresearch.com securepubads.g.doubleclick.net www.google-analytics.com analytics.google.com www.googletagmanager.com *.googletagservices.com 'unsafe-inline' 'unsafe-eval' *.cookielaw.org www.redditstatic.com alb.reddit.com analytics.tiktok.com s.pinimg.com *.ketchcdn.com *.ketchjs.com static.cloudflareinsights.com". Note that 'script-src-elem' was not explicitly set, so 'script-src' is used as a fallback. The action has been blocked. |
/pagead/managed/js/gpt/m202604090101/pubads_impl.js?cb=31... line 18, col 380265 | Loading the script 'https://invstatic101.creativecdn.com/encrypted-signals/encrypted-tag-g.js' violates the following Content Security Policy directive: "script-src 'self' 'unsafe-eval' 'unsafe-inline' *.pbs.org *.googlesyndication.com *.adtrafficquality.google adservice.google.com adservice.google.co.in connect.facebook.net fundingchoicesmessages.google.com *.2mdn.net *.nr-data.net sb.scorecardresearch.com securepubads.g.doubleclick.net www.google-analytics.com analytics.google.com www.googletagmanager.com *.googletagservices.com 'unsafe-inline' 'unsafe-eval' *.cookielaw.org www.redditstatic.com alb.reddit.com analytics.tiktok.com s.pinimg.com *.ketchcdn.com *.ketchjs.com static.cloudflareinsights.com". Note that 'script-src-elem' was not explicitly set, so 'script-src' is used as a fallback. The action has been blocked. |
/pagead/managed/js/gpt/m202604090101/pubads_impl.js?cb=31... line 18, col 380265 | Loading the script 'https://static.criteo.net/js/ld/publishertag.ids.js' violates the following Content Security Policy directive: "script-src 'self' 'unsafe-eval' 'unsafe-inline' *.pbs.org *.googlesyndication.com *.adtrafficquality.google adservice.google.com adservice.google.co.in connect.facebook.net fundingchoicesmessages.google.com *.2mdn.net *.nr-data.net sb.scorecardresearch.com securepubads.g.doubleclick.net www.google-analytics.com analytics.google.com www.googletagmanager.com *.googletagservices.com 'unsafe-inline' 'unsafe-eval' *.cookielaw.org www.redditstatic.com alb.reddit.com analytics.tiktok.com s.pinimg.com *.ketchcdn.com *.ketchjs.com static.cloudflareinsights.com". Note that 'script-src-elem' was not explicitly set, so 'script-src' is used as a fallback. The action has been blocked. |
Issues logged to the `Issues` panel in Chrome Devtools indicate unresolved problems. They can come from network request failures, insufficient security controls, and other browser concerns. Open up the Issues panel in Chrome DevTools for more details on each issue.
Performance issues directly impact user engagement and conversion rates.
| Issue type |
|---|
| Content security policy |
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.