Lighthouse Desktop

· 0 checks — Desktop 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
cdn.cookielaw.org/consent/25ab360c-347c-4a85-8b93-1e0326234b75/OtAutoBlock.js	86400.0 s	1.1 MiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	169.2 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.4 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	67.0 KiB
cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js	86400.0 s	129.9 KiB
/signals/config/1457291081167286?v=2.9.298&r=stable&domai...	1200.0 s	52.6 KiB
cdn.amplitude.com/engagement-browser/prod/split/index.js	60.0 s	40.0 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	25.5 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	21.6 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	20.9 KiB
trk.udemy.com/A6439962-7269-48c9-b939-f1abe7cb5ed61.js	900.0 s	22.5 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	16.5 KiB
bat.bing.com/p/insights/s/0.8.59	0.0 ms	15.6 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	13.5 KiB
refer.udemy.com/core.js	3600.0 s	16.4 KiB
s.yimg.jp/images/listing/tool/cv/ytag.js	600.0 s	11.8 KiB
www.udemy.com/cdn-cgi/challenge-platform/h/g/scripts/jsd/b0a7532ac8ec/main.js?	14400.0 s	12.8 KiB
www.upsellit.com/active/Udemy.jsp	86400.0 s	18.4 KiB
cdn.cookielaw.org/scripttemplates/otSDKStub.js	86400.0 s	9.1 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	3.4 KiB
/logos/c7d0d27d-e055-4572-8927-d3c994df5f60/01993998-4d83...	86400.0 s	7.5 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	2.4 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	1.9 KiB
www.udemy.com/staticx/udemy/images/v7/logo-udemy-inverted.svg	0.0 ms	1.1 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg	86400.0 s	2.5 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	1.0 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	1012 B
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	971 B
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	945 B
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	915 B
use.fontawesome.com/7f85a56ba4.css	1800.0 s	888 B
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	60.0 s	676 B
/tr/?id=1457291081167286&ev=PageView&dl=https%3A%2F%2Fwww...	0.0 ms	19 B

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
frontends.udemycdn.com/thesis/fonts/noto-sans-jp-japanese-400-normal.woff2	55 ms
frontends.udemycdn.com/thesis/fonts/Vazirmatn-Light.woff2	20 ms

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:15.727 source:map[column:532018 line:0 type:source-location url:https://frontends.udemycdn.com/frontends-homepage/_next/static/chunks/649-5ae42935861d63e1.js urlProvider:network]] map[reflowTime:16.484 source:map[type:text value:[unattributed]]]]

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/4ecf5f5f-1e48…" 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

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

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.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.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/4ecf5f5f-1e48-4783-8b0...	118.4 KiB	31.2 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

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 209 ms

URL	Time Spent
udemy.com/	209 ms
www.udemy.com/	0.0 ms

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 60.6 KiB

URL	Transfer Size	Est Savings
	23.2 KiB	23.0 KiB
frontends.udemycdn.com/frontends-homepage/_next/static/css/18554739ce71a9c8.css	16.2 KiB	13.9 KiB
frontends.udemycdn.com/frontends-homepage/_next/static/css/79ad33b1859a5665.css	14.8 KiB	12.7 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: 250 ms 982.9 KiB

URL	Transfer Size	Est Savings
/frontends-homepage/_next/static/chunks/pages/_app-30dede...	320.8 KiB	180.9 KiB
gtm.udemy.com/gtag/js?id=G-7YMFEFLR6Q	199.7 KiB	129.6 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	168.7 KiB	91.2 KiB
cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js	129.7 KiB	72.1 KiB
accounts.google.com/gsi/client	95.4 KiB	68.2 KiB
www.googletagmanager.com/gtag/js?id=G-7YMFEFLR6Q&cx=c&gtm=4e64e1	173.6 KiB	64.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-7BF3X	187.0 KiB	61.1 KiB
/frontends-homepage/_next/static/chunks/649-5ae42935861d6...	155.4 KiB	60.4 KiB
www.googletagmanager.com/gtag/js?id=AW-877556973&cx=c&gtm=4e64e1	145.8 KiB	55.1 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	66.5 KiB	49.2 KiB
/frontends-homepage/_next/static/chunks/163-5b0993bd12ac0...	92.7 KiB	40.1 KiB
connect.facebook.net/en_US/fbevents.js	96.3 KiB	36.4 KiB
cl.qualaroo.com/ki.js/34436/6GL.js	78.9 KiB	31.8 KiB
/frontends-homepage/_next/static/chunks/1edf0483.9dfe51f2...	50.3 KiB	21.6 KiB
cdn.amplitude.com/engagement-browser/prod/split/index.js	39.4 KiB	20.9 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-6d5f16...	1.6 s	1.5 s	2.7 ms
cdn.cookielaw.org/consent/25ab360c-347c-4a85-8b93-1e0326234b75/OtAutoBlock.js	674 ms	371 ms	295 ms
/frontends-homepage/_next/static/chunks/pages/_app-30dede...	526 ms	274 ms	47 ms
www.googletagmanager.com/gtm.js?id=GTM-7BF3X	524 ms	479 ms	24 ms
Unattributable	462 ms	94 ms	0.0 ms
www.udemy.com/	325 ms	16 ms	1.0 ms
/frontends-homepage/_next/static/chunks/649-5ae42935861d6...	242 ms	109 ms	22 ms
www.googletagmanager.com/gtag/js?id=AW-877556973&cx=c&gtm=4e64e1	176 ms	162 ms	13 ms
cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js	120 ms	96 ms	16 ms
www.googletagmanager.com/gtag/js?id=G-7YMFEFLR6Q&cx=c&gtm=4e64e1	116 ms	97 ms	16 ms
www.udemy.com/cdn-cgi/challenge-platform/scripts/jsd/main.js	101 ms	82 ms	0.9 ms
trk.udemy.com/A6439962-7269-48c9-b939-f1abe7cb5ed61.js	99 ms	96 ms	1.6 ms
/signals/config/1457291081167286?v=2.9.298&r=stable&domai...	59 ms	50 ms	7.7 ms
cl.qualaroo.com/ki.js/34436/6GL.js	54 ms	47 ms	6.9 ms
/frontends-homepage/_next/static/UNNFdklUygVJCP3xtwvHv/_b...	51 ms	42 ms	0.2 ms
static.ads-twitter.com/uwt.js	51 ms	48 ms	2.0 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
Script Evaluation	3.9 s
Other	633 ms
Script Parsing & Compilation	553 ms
Style & Layout	258 ms
Parse HTML & CSS	144 ms
Rendering	134 ms
Garbage Collection	90 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.

URL	Transfer Size
cdn.cookielaw.org/consent/25ab360c-347c-4a85-8b93-1e0326234b75/OtAutoBlock.js	1.1 MiB
frontends.udemycdn.com/thesis/fonts/noto-sans-jp-japanese-400-normal.woff2	957.5 KiB
/frontends-homepage/_next/static/chunks/pages/_app-30dede...	321.1 KiB
gtm.udemy.com/gtag/js?id=G-7YMFEFLR6Q	199.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-7BF3X	187.3 KiB
www.googletagmanager.com/gtag/js?id=G-7YMFEFLR6Q&cx=c&gtm=4e64e1	173.6 KiB
/engagement-browser/prod/split/570e5eb8ec4e69d98adfe7be4c...	169.2 KiB
/frontends-homepage/_next/static/chunks/649-5ae42935861d6...	155.7 KiB
www.googletagmanager.com/gtag/js?id=AW-877556973&cx=c&gtm=4e64e1	145.8 KiB
/96883mtakkm8/9Gj6y7OdRKhBmHkgJ9lWV/4589dcd6feb8009798924...	143.4 KiB

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.

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Render blocking requests

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 19 user timings

●Avoid long main-thread tasks 20 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 320 ms

●Server Backend Latencies 320 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 40 ms

●Avoid large layout shifts 4 layout shifts found

○INP breakdown

○Avoid non-composited animations

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--114 > div.carousel_scroll-item__yo6VS > div.ud-nav-button-container > button#tabs--113-tab-0`
Python `div#scroll-port--114 > div.carousel_scroll-item__yo6VS > div.ud-nav-button-container > button#tabs--113-tab-1`
Microsoft Excel `div#scroll-port--114 > div.carousel_scroll-item__yo6VS > div.ud-nav-button-container > button#tabs--113-tab-2`
AI Agents & Agentic AI `div#scroll-port--114 > div.carousel_scroll-item__yo6VS > div.ud-nav-button-container > button#tabs--113-tab-3`
Digital Marketing `div#scroll-port--114 > div.carousel_scroll-item__yo6VS > div.ud-nav-button-container > button#tabs--113-tab-4`
Amazon AWS `div#scroll-port--114 > div.carousel_scroll-item__yo6VS > div.ud-nav-button-container > button#tabs--113-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
Jump into learning — for less If you’re new to Udemy, we’ve got good news: For… `div > section.carousel_container__WqAI_ > div#scroll-port--61 > div.carousel_scroll-item__yo6VS`
Subscribe to the best of Udemy With Personal Plan, you get access to 26,000+ o… `div > section.carousel_container__WqAI_ > div#scroll-port--61 > div.carousel_scroll-item__yo6VS`
Subscribe to the best of Udemy With Personal Plan, you get access to 26,000+ o… `div > section.carousel_container__WqAI_ > div#scroll-port--61 > 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`
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`
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`
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`
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`
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`
5,569,334 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`
50,441,527 learners `div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc`
14,531,023 learners `div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc`
8,401,070 learners `div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc`
3,132,384 learners `div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc`
2,154,344 learners `div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc`
4,707,768 learners `div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc`
2,921,212 learners `div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc`
5,204,386 learners `div.trending-skills_content__Vb619 > div.trending-topics_category-column__dtZji > div.trending-topics_topic__VPZNd > span.trending-topics_stat__Xofxc`
498,967 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
Generative AI `a.topic-card_topic-card__KfEHK > div.topic-card_info__vTGxl > div.topic-card_title-container__ZLjUF > h4.topic-card_title__bCJkp`

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.

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	www.udemy.com/cdn-cgi/challenge-platform/scripts/jsd/main.js
StorageType.persistent is deprecated. Please use standardized navigator.storage instead.	www.udemy.com/cdn-cgi/challenge-platform/scripts/jsd/main.js
Fledge	www.udemy.com/cdn-cgi/challenge-platform/scripts/jsd/main.js
AttributionReporting	connect.facebook.net/en_US/fbevents.js line 279, col 769

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
/kpi?c=udemy&tag_id=288&user_id=ff78abefe0154fc09d31a09e9...	`Failed to load resource: net::ERR_NAME_NOT_RESOLVED`
www.udemy.com/api-2.0/visits/me/datadog-increment-logs/	`Failed to load resource: the server responded with a status of 400 ()`
www.udemy.com/	`Not signed in with the identity provider.`

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

●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

○Redirects HTTP traffic to HTTPS

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/pricing/	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