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Lighthouse Desktop
· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.SCORE
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Detailed Report
Audit breakdown by category with detailed findings.
42
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 |
|---|---|---|
| cdn.cookielaw.org/consent/25ab360c-347c-4a85-8b93-1e0326234b75/OtAutoBlock.js | 86400.0 s | 1.1 MiB |
| cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js | 86400.0 s | 129.9 KiB |
| refer.udemy.com/core.js | 3600.0 s | 16.4 KiB |
| www.udemy.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/625261456364/main.js? | 14400.0 s | 13.0 KiB |
| cdn.cookielaw.org/scripttemplates/otSDKStub.js | 86400.0 s | 9.1 KiB |
| s.udemycdn.com/partner-logos/v4/nasdaq-light.svg | 0.0 ms | 2.6 KiB |
| www.udemy.com/staticx/udemy/images/v7/logo-udemy-inverted.svg | 0.0 ms | 1.1 KiB |
| use.fontawesome.com/7f85a56ba4.css | 1800.0 s | 879 B |
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.
Why this matters
Performance issues directly impact user engagement and conversion rates.
headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.142735] map[node:map[boundingRect:map[bottom:1722 height:578 left:0 right:1350 top:1144 width:1350] lhId:page-18-DIV nodeLabel:Reimagine your career in the AI era
Future-proof your skills with Personal Pla… path:1,HTML,1,BODY,0,DIV,0,DIV,1,MAIN,0,DIV,0,DIV,0,DIV,3,SECTION,0,DIV selector:div.ud-container > div.content-area_container__fpa9z > section > div.ud-full-viewport-container snippet:<div class="ud-full-viewport-container"> type:node] score:0.085756 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:4724 height:44 left:841 right:956 top:4680 width:115] lhId:page-42-IMG nodeLabel:Nasdaq path:1,HTML,1,BODY,0,DIV,0,DIV,2,FOOTER,0,DIV,1,DIV,0,IMG selector:footer.ud-footer > div.footer-section > div.ufb-notice_partner-logos__SEnVX > img snippet:<img src="https://s.udemycdn.com/partner-logos/v4/nasdaq-light.svg" alt="Nasdaq" height="44" width="115" loading="lazy"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:1722 height:578 left:0 right:1350 top:1144 width:1350] lhId:page-18-DIV nodeLabel:Reimagine your career in the AI era
Future-proof your skills with Personal Pla… path:1,HTML,1,BODY,0,DIV,0,DIV,1,MAIN,0,DIV,0,DIV,0,DIV,3,SECTION,0,DIV selector:div.ud-container > div.content-area_container__fpa9z > section > div.ud-full-viewport-container snippet:<div class="ud-full-viewport-container"> type:node] score:0.055994 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:2076 height:48 left:69 right:117 top:2028 width:48] lhId:page-43-IMG nodeLabel:Volkswagen logo path:1,HTML,1,BODY,0,DIV,0,DIV,1,MAIN,0,DIV,0,DIV,0,DIV,5,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,1,UL,0,LI,0,IMG selector:div.partners-banner_content__Ohhs3 > ul.ud-unstyled-list > li.partner-logos_item__p5ot7 > img snippet:<img src="https://cms-images.udemycdn.com/96883mtakkm8/3E0eIh3tWHNWADiHNBmW4j/3444d1…" alt="Volkswagen logo" loading="eager"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:124 height:48 left:291 right:799 top:76 width:508] lhId:page-15-DIV nodeLabel:Search for anything path:1,HTML,1,BODY,0,DIV,0,DIV,0,DIV,3,HEADER,4,DIV selector:div.layout_container__yNKXj > div.header_desktop-only__DXp_G > header.ud-header > div.ud-search-form-autocomplete snippet:<div lang="en" locale="en_US" direction="ltr" class="ud-search-form-autocomplete desktop-header_search-bar__XKKoS ud-form-group"> type:node] score:0.000758] map[node:map[boundingRect:map[bottom:124 height:48 left:291 right:799 top:76 width:508] lhId:page-15-DIV nodeLabel:Search for anything path:1,HTML,1,BODY,0,DIV,0,DIV,0,DIV,3,HEADER,4,DIV selector:div.layout_container__yNKXj > div.header_desktop-only__DXp_G > header.ud-header > div.ud-search-form-autocomplete snippet:<div lang="en" locale="en_US" direction="ltr" class="ud-search-form-autocomplete desktop-header_search-bar__XKKoS ud-form-group"> type:node] score:0.000227]]
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.
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 | |
|---|---|---|---|
div.wide-hero-banner-slide_banner__XkYhc > div.wide-hero-banner-slide_image-container__Amgrq > picture > img div.wide-hero-banner-slide_banner__XkYhc > div.wide-hero-banner-slide_image-container__Amgrq > picture > img | /notices/home_carousel_slide/image/f5b67e02-2c6e-42ae-bbb... | 255.0 KiB | 167.8 KiB |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/5655756_50d9_10.jpg | 100.8 KiB | 93.7 KiB |
CompTIA certification badges including A+, Security+, Network+, Linux+, PenTest… div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | /frontends-homepage/staticx/udemy/images/cert-prep/compti... | 87.6 KiB | 84.9 KiB |
Amazon Web Services (AWS) certification badges including Solutions Architect As… div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | /frontends-homepage/staticx/udemy/images/cert-prep/aws-th... | 87.4 KiB | 84.7 KiB |
div.learning-testimonial-card_testimonial-wrapper__V3QMp > div.learning-testimonial-card_source-small__jBKeN > div.learning-testimonial-card_source-avatar__1n_8I > img.ud-avatar div.learning-testimonial-card_testimonial-wrapper__V3QMp > div.learning-testimonial-card_source-small__jBKeN > div.learning-testimonial-card_source-avatar__1n_8I > img.ud-avatar | /96883mtakkm8/1Djz6c0gZLaCG5SQS3PgUY/54b6fb8c85d8da01da95... | 76.3 KiB | 76.1 KiB |
Project Management Institute (PMI) certification badges including PMP, CAPM, PM… div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | /frontends-homepage/staticx/udemy/images/cert-prep/pmi-th... | 66.3 KiB | 64.3 KiB |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | s.udemycdn.com/career-academies/product-cards/career-card-cloud-engineer.png | 49.2 KiB | 37.0 KiB |
div.learning-testimonial-card_testimonial-wrapper__V3QMp > div.learning-testimonial-card_source-small__jBKeN > div.learning-testimonial-card_source-avatar__1n_8I > img.ud-avatar div.learning-testimonial-card_testimonial-wrapper__V3QMp > div.learning-testimonial-card_source-small__jBKeN > div.learning-testimonial-card_source-avatar__1n_8I > img.ud-avatar | /96883mtakkm8/6dT7xusLHYoOUizXeVqgUk/4317f63fe25b2e07ad8c... | 27.7 KiB | 27.4 KiB |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | s.udemycdn.com/career-academies/product-cards/career-card-digitalmarketer.png | 35.9 KiB | 27.0 KiB |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/2776760_f176_10.jpg | 29.3 KiB | 25.3 KiB |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/6100015_1979_5.jpg | 22.6 KiB | 19.5 KiB |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/6566789_2e8a_10.jpg | 20.2 KiB | 17.4 KiB |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | s.udemycdn.com/career-academies/product-cards/career-card-data-scientist.png | 19.9 KiB | 15.0 KiB |
div.learning-testimonial-card_testimonial-wrapper__V3QMp > div.learning-testimonial-card_source-small__jBKeN > div.learning-testimonial-card_source-avatar__1n_8I > img.ud-avatar div.learning-testimonial-card_testimonial-wrapper__V3QMp > div.learning-testimonial-card_source-small__jBKeN > div.learning-testimonial-card_source-avatar__1n_8I > img.ud-avatar | /96883mtakkm8/3RtbxhMUTMftb9PKczSTDW/f383a1effc2975968d2f... | 8.6 KiB | 8.3 KiB |
div.learning-testimonial-card_testimonial-wrapper__V3QMp > div.learning-testimonial-card_source-small__jBKeN > div.learning-testimonial-card_source-avatar__1n_8I > img.ud-avatar div.learning-testimonial-card_testimonial-wrapper__V3QMp > div.learning-testimonial-card_source-small__jBKeN > div.learning-testimonial-card_source-avatar__1n_8I > img.ud-avatar | /96883mtakkm8/1AXU6146N5h3Ti9rGXytFv/4832b694a15fa19c4f05... | 8.5 KiB | 8.2 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-0-IMG
nodeLabel: div.wide-hero-banner-slide_banner__XkYhc > div.wide-hero-banner-slide_image-container__Amgrq > picture > img
path: 1,HTML,1,BODY,0,DIV,0,DIV,1,MAIN,0,DIV,0,DIV,0,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,SECTION,1,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,PICTURE,1,IMG
selector: div.wide-hero-banner-slide_banner__XkYhc > div.wide-hero-banner-slide_image-container__Amgrq > picture > img
snippet: <img src="https://img-c.udemycdn.com/notices/home_carousel_slide/image/f5b67e02-2c6e…" alt="" width="1340" height="400" loading="eager">
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.
More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.
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
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
These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.
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
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Element | Layout shift score |
|---|---|
Reimagine your career in the AI era
Future-proof your skills with Personal Pla… div.ud-container > div.content-area_container__fpa9z > section > div.ud-full-viewport-container | 0.086 |
Reimagine your career in the AI era
Future-proof your skills with Personal Pla… div.ud-container > div.content-area_container__fpa9z > section > div.ud-full-viewport-container | 0.056 |
Search for anything div.layout_container__yNKXj > div.header_desktop-only__DXp_G > header.ud-header > div.ud-search-form-autocomplete | 0.001 |
Search for anything div.layout_container__yNKXj > div.header_desktop-only__DXp_G > header.ud-header > div.ud-search-form-autocomplete | 0.000 |
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
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.
Why this matters
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.
Why this matters
Performance issues directly impact user engagement and conversion rates.
Estimated savings: 0.0 ms 36.9 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| frontends.udemycdn.com/frontends-homepage/_next/static/css/f623e5e0a57a58a5.css | 16.3 KiB | 13.9 KiB |
| frontends.udemycdn.com/frontends-homepage/_next/static/css/7fe49f0f09b1871b.css | 14.1 KiB | 12.0 KiB |
| .ab-pause-scrolling,body.ab-pause-scrolling,html.ab-pause-scrolling{overflow:hidden; … } … | 11.0 KiB | 11.0 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: 210 ms 502.6 KiB
| URL | Transfer Size | Est Savings |
|---|---|---|
| /frontends-homepage/_next/static/chunks/pages/_app-b224ea... | 321.8 KiB | 202.6 KiB |
| cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js | 129.7 KiB | 107.3 KiB |
| accounts.google.com/gsi/client | 92.7 KiB | 68.5 KiB |
| /frontends-homepage/_next/static/chunks/649-6254f0927693b... | 154.0 KiB | 62.9 KiB |
| /frontends-homepage/_next/static/chunks/163-715a7e94cdaaa... | 92.5 KiB | 39.7 KiB |
| /frontends-homepage/_next/static/chunks/1edf0483.9dfe51f2... | 50.3 KiB | 21.6 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 |
|---|---|---|---|
| /frontends-homepage/_next/static/chunks/pages/lohp-b6ea9a... | 1.4 s | 1.1 s | 2.4 ms |
| /frontends-homepage/_next/static/chunks/pages/_app-b224ea... | 377 ms | 221 ms | 32 ms |
| cdn.cookielaw.org/consent/25ab360c-347c-4a85-8b93-1e0326234b75/OtAutoBlock.js | 342 ms | 86 ms | 256 ms |
| /frontends-homepage/_next/static/7X7PJwEDfA63XeUwLNJKc/_b... | 314 ms | 268 ms | 0.1 ms |
| www.udemy.com/ | 232 ms | 19 ms | 0.8 ms |
| Unattributable | 188 ms | 8.2 ms | 0.0 ms |
| /frontends-homepage/_next/static/chunks/649-6254f0927693b... | 181 ms | 76 ms | 15 ms |
| www.udemy.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 88 ms | 80 ms | 0.9 ms |
| /frontends-homepage/_next/static/chunks/framework-8b79745... | 80 ms | 68 ms | 7.8 ms |
| /frontends-homepage/_next/static/chunks/1edf0483.9dfe51f2... | 75 ms | 69 ms | 4.2 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 |
|---|---|
| Script Evaluation | 2.1 s |
| Script Parsing & Compilation | 368 ms |
| Other | 365 ms |
| Garbage Collection | 228 ms |
| Style & Layout | 197 ms |
| Parse HTML & CSS | 90 ms |
| Rendering | 69 ms |
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.
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 | |
|---|---|
CompTIA certification badges including A+, Security+, Network+, Linux+, PenTest… div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | /frontends-homepage/staticx/udemy/images/cert-prep/compti... |
Amazon Web Services (AWS) certification badges including Solutions Architect As… div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | /frontends-homepage/staticx/udemy/images/cert-prep/aws-th... |
Project Management Institute (PMI) certification badges including PMP, CAPM, PM… div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | /frontends-homepage/staticx/udemy/images/cert-prep/pmi-th... |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | s.udemycdn.com/career-academies/product-cards/career-card-cloud-engineer.png |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | s.udemycdn.com/career-academies/product-cards/career-card-data-scientist.png |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | s.udemycdn.com/career-academies/product-cards/career-card-digitalmarketer.png |
Role play interface showing AI conversation practice section.personal-plan-banner_personal-plan-banner__eMtYR > div.personal-plan-banner_banner-content__ZUkJT > div.personal-plan-banner_image-section__qqttw > img | frontends.udemycdn.com/staticx/udemy/images/ai-career-banner/ai-career@1x.webp |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/6566789_2e8a_10.jpg |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/6100015_1979_5.jpg |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/2776760_f176_10.jpg |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/5655756_50d9_10.jpg |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/2196488_8fc7_10.jpg |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/3142166_a637_3.jpg |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/6112535_7103.jpg |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/5238734_c8a8_3.jpg |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | img-c.udemycdn.com/course/750x422/6082775_2db5_3.jpg |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | |
div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO div.vertical-card_primary__rILsS > div.vertical-card_primary-top__B_gkL > div > img.card-media-image_image__PUuGO | |
Vimeo logo div.partners-banner_content__Ohhs3 > ul.ud-unstyled-list > li.partner-logos_item__p5ot7 > img | /96883mtakkm8/23XnhdqwGCYUhfgIJzj3PM/77259d1ac2a7d771c444... |
Hewlett Packard Enterprise logo div.partners-banner_content__Ohhs3 > ul.ud-unstyled-list > li.partner-logos_item__p5ot7 > img | /96883mtakkm8/1GoAicYDYxxRPGnCpg93gi/a8b6190cc1a24e21d622... |
Cisco logo div.partners-banner_content__Ohhs3 > ul.ud-unstyled-list > li.partner-logos_item__p5ot7 > img | /96883mtakkm8/3YzfvEjCAUi3bKHLW2h1h8/ec478fa1ed75f6090a7e... |
Samsung logo div.partners-banner_content__Ohhs3 > ul.ud-unstyled-list > li.partner-logos_item__p5ot7 > img | /96883mtakkm8/2pNyDO0KV1eHXk51HtaAAz/090fac96127d62e784df... |
Ericsson logo div.partners-banner_content__Ohhs3 > ul.ud-unstyled-list > li.partner-logos_item__p5ot7 > img | /96883mtakkm8/7guDRVYa2DZD0wD1SyxREP/b704dfe6b0ffb3b26253... |
Citi logo div.partners-banner_content__Ohhs3 > ul.ud-unstyled-list > li.partner-logos_item__p5ot7 > img | /96883mtakkm8/2tQm6aYrWQzlKBQ95W00G/c7aaf002814c2cde71d41... |
Volkswagen logo div.partners-banner_content__Ohhs3 > ul.ud-unstyled-list > li.partner-logos_item__p5ot7 > img | /96883mtakkm8/3E0eIh3tWHNWADiHNBmW4j/3444d1a4d029f283aa7d... |
Procter & Gamble logo div.partners-banner_content__Ohhs3 > ul.ud-unstyled-list > li.partner-logos_item__p5ot7 > img | /96883mtakkm8/1UUVZtTGuvw23MwEnDPUr3/2683579ac045486a0aff... |
More information about the performance of your application. These numbers don't directly affect the Performance score.
●Document request latency
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Render blocking requests
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 7 user timings
●Avoid long main-thread tasks 10 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 100 ms
●Server Backend Latencies 240 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 50 ms
○INP breakdown
○Avoid non-composited animations
84
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 |
|---|
Artificial Intelligence (AI)
Python
Microsoft Excel
AI Agents & Agentic AI
Digi… div.professional-skills-showcase_professional-skills-unit__n4FBR > div.professional-skills-unit_skills-hub-unit__pmRiu > div.tabs_tabs-container__cfdeU > div.ud-tabs-nav-buttons |
Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. Learn more about ARIA roles and required parent element.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Artificial Intelligence (AI) div#scroll-port--105 > div.carousel_scroll-item__yo6VS > div.ud-nav-button-container > button#tabs--104-tab-0 |
Python div#scroll-port--105 > div.carousel_scroll-item__yo6VS > div.ud-nav-button-container > button#tabs--104-tab-1 |
Microsoft Excel div#scroll-port--105 > div.carousel_scroll-item__yo6VS > div.ud-nav-button-container > button#tabs--104-tab-2 |
AI Agents & Agentic AI div#scroll-port--105 > div.carousel_scroll-item__yo6VS > div.ud-nav-button-container > button#tabs--104-tab-3 |
Digital Marketing div#scroll-port--105 > div.carousel_scroll-item__yo6VS > div.ud-nav-button-container > button#tabs--104-tab-4 |
Amazon AWS div#scroll-port--105 > div.carousel_scroll-item__yo6VS > div.ud-nav-button-container > button#tabs--104-tab-5 |
Focusable descendents within an `[aria-hidden="true"]` element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn how `aria-hidden` affects focusable elements.
Why this matters
Informational: a Permissions-Policy directive showing feature -> allowed origins.
Source: MDN Permissions-Policy
| Failing Elements |
|---|
Build in-demand skills
Get access to 26,000 courses from real-world experts wi… div > section.carousel_container__WqAI_ > div#scroll-port--52 > div.carousel_scroll-item__yo6VS |
Ultimate AWS Certified Solutions Architect Associate 2026
Full Practice Exam | … div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
[NEW] Ultimate AWS Certified Cloud Practitioner CLF-C02 2026
Full Practice Exam… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
The AI Engineer Course 2026: Complete AI Engineer Bootcamp
Complete AI Engineer… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
The Complete Prompt Engineering for AI Bootcamp (2026)
Learn practical coding s… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
[NEW] Ultimate AWS Certified AI Practitioner AIF-C01
Practice Exam included + e… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
AI Coder: Vibe Coder to Agentic Engineer in 3 Weeks
The Complete Course on Codi… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
Machine Learning A-Z: AI, Python & R + ChatGPT Prize [2026]
Learn to create Mac… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
The Complete Python Bootcamp From Zero to Hero in Python
Learn Python like a Pr… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
The Complete Full-Stack Web Development Bootcamp
Become a Full-Stack Web Develo… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
Claude Code - The Practical Guide
Boost your agentic engineering game by master… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
Python for Data Science and Machine Learning Bootcamp
Learn how to use NumPy, P… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
Full stack generative and Agentic AI with python
Hands-on guide to modern AI: T… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
LangChain- Agentic AI Engineering with LangChain & LangGraph
Build AI Agents wi… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
Playwright JS/TS Automation Testing from Scratch & Framework
100k Learners- Pla… div.discovery-units_discovery-unit__VrcOC > section.carousel_container__WqAI_ > div#course-unit-container-Trendingcourses > div.carousel_scroll-item__yo6VS |
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 |
|---|
Google AI Essentials graduate div.learning-testimonial-card_source-details__Hg7l1 > div.learning-testimonial-card_source-title__FYs92 > span > p |
Technical Co-Founder, CTO at Dimensional div.learning-testimonial-card_source-details__Hg7l1 > div.learning-testimonial-card_source-title__FYs92 > span > p |
Partner Account Manager at Amazon Web Services div.learning-testimonial-card_source-details__Hg7l1 > div.learning-testimonial-card_source-title__FYs92 > span > p |
Google AI Professional Certificate graduate div.learning-testimonial-card_source-details__Hg7l1 > div.learning-testimonial-card_source-title__FYs92 > span > p |
5,562,287 learners div.trending-skills_content__Vb619 > div.trending-skills_top-skill-with-cta__UHtM0 > div.top-skill_top-skill__m2saE > span.top-skill_stat__IEF93 |
50,422,859 learners div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc |
14,526,288 learners div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc |
8,396,659 learners div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc |
3,130,210 learners div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc |
4,705,945 learners div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc |
2,152,539 learners div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc |
2,915,006 learners div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc |
5,198,930 learners div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc |
497,851 learners div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc |
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 |
|---|
Learn essential career and life skills div > div.enriched-skills_layout-12-column-container__cjUXe > div.enriched-skills_placeholder-3-column__exa1_ > h3.enriched-skills_heading__qoXgl |
These are opportunities to improve keyboard navigation in your application.
○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]` values are valid
●`[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.
●ARIA attributes are used as specified for the element's role
●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
●Links are distinguishable without relying on color.
●Links have a discernible name
●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
●Touch targets have sufficient size and spacing.
●`[lang]` attributes have a valid value
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
○`[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
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○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
○Select elements have associated label elements.
○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.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Elements with visible text labels have matching accessible names.
○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.
77
Best Practices
General
Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Deprecation / Warning | Source |
|---|---|
| SharedStorage | |
| StorageType.persistent is deprecated. Please use standardized navigator.storage instead. | |
| Fledge |
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 |
|---|---|
[GSI_LOGGER]: FedCM get() rejects with NetworkError: Error retrieving a token. | |
Access to fetch at 'https://cdn.cookielaw.org/consent/25ab360c-347c-4a85-8b93-1e0326234b75/019d4067-5f82-793d-90b6-5163acbedf24/en.json' from origin 'https://www.udemy.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. | |
Failed to load resource: net::ERR_FAILED | |
Not signed in with the identity provider. | |
cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js line 6, col 540684 | Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'DomainData') |
●Uses HTTPS
●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 clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
92
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.udemy.com/teaching/?ref=teach_header | Learn more |
| www.udemy.com/personal-plan/ | 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
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`
○robots.txt is valid