Lighthouse Mobile

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
pl.tedcdn.com/fonts/InterVariable.woff2	0.0 ms	344.6 KiB
cdn.yourbow.com/ted/hbyb.js	3600.0 s	196.3 KiB
/fss/fve7g7/bafb024b-e8af-4444-b81c-c4a2a7d52be2/Bottom+B...	0.0 ms	138.3 KiB
cdn.fundraiseup.com/widget/AVFWZGUV	0.0 ms	69.5 KiB
ak.sail-horizon.com/spm/spm.v1.min.js	600.0 s	55.2 KiB
b-code.liadm.com/a-091g.min.js	86400.0 s	46.9 KiB
cmp.osano.com/AzqTgHUHUGJa7gInt/9e4d9097-fa02-474b-9ac9-958cf3f54337/osano-ui.js	86400.0 s	31.0 KiB
static.cdn.prismic.io/prismic.js?new=true&repo=tedconf	0.0 ms	9.8 KiB
cdn.rudderlabs.com/3.21.0/modern/plugins/rsa-plugins-RetryQueue.min.js	3600.0 s	3.9 KiB
cdn.rudderlabs.com/3.21.0/modern/plugins/rsa-plugins-common.min.js	3600.0 s	3.5 KiB
vz-8bbc7bbf-a1e.b-cdn.net/44455006-1a54-4b23-bfe8-c6187b9478d5/720p/video.m3u8	30.0 s	1.8 KiB
vz-8bbc7bbf-a1e.b-cdn.net/44455006-1a54-4b23-bfe8-c6187b9478d5/480p/video.m3u8	30.0 s	1.8 KiB
vz-8bbc7bbf-a1e.b-cdn.net/c0618340-2751-4cb8-bcbd-3992c694dac3/720p/video.m3u8	30.0 s	1.8 KiB
vz-8bbc7bbf-a1e.b-cdn.net/c0618340-2751-4cb8-bcbd-3992c694dac3/480p/video.m3u8	30.0 s	1.7 KiB
vz-8bbc7bbf-a1e.b-cdn.net/42e70133-846c-4d82-b891-6715daa034dc/720p/video.m3u8	30.0 s	1.7 KiB
vz-8bbc7bbf-a1e.b-cdn.net/42e70133-846c-4d82-b891-6715daa034dc/480p/video.m3u8	30.0 s	1.7 KiB
vz-8bbc7bbf-a1e.b-cdn.net/bde3fe3d-fa23-4257-b5bb-c42dfa9086eb/1080p/video.m3u8	30.0 s	1.6 KiB
vz-8bbc7bbf-a1e.b-cdn.net/bde3fe3d-fa23-4257-b5bb-c42dfa9086eb/480p/video.m3u8	30.0 s	1.6 KiB
vz-8bbc7bbf-a1e.b-cdn.net/49a16d6c-9839-438c-a814-ee646f5b515f/720p/video.m3u8	30.0 s	1.4 KiB
vz-8bbc7bbf-a1e.b-cdn.net/49a16d6c-9839-438c-a814-ee646f5b515f/480p/video.m3u8	30.0 s	1.4 KiB
vz-8bbc7bbf-a1e.b-cdn.net/7740cf90-8213-4c38-8b2f-68813d73045d/480p/video.m3u8	30.0 s	1.4 KiB
vz-8bbc7bbf-a1e.b-cdn.net/d8644e4c-8639-4796-b1fa-8eacec07c26a/480p/video.m3u8	30.0 s	1.4 KiB
vz-8bbc7bbf-a1e.b-cdn.net/d8644e4c-8639-4796-b1fa-8eacec07c26a/720p/video.m3u8	30.0 s	1.4 KiB
vz-8bbc7bbf-a1e.b-cdn.net/a1599794-4c67-4c14-9161-d08bf188b37c/720p/video.m3u8	30.0 s	1.4 KiB
vz-8bbc7bbf-a1e.b-cdn.net/a1599794-4c67-4c14-9161-d08bf188b37c/480p/video.m3u8	30.0 s	1.3 KiB
cdn.rudderlabs.com/3.21.0/modern/plugins/rsa-plugins-remote-XhrQueue.min.js	3600.0 s	1.6 KiB
vz-8bbc7bbf-a1e.b-cdn.net/e921c045-0f6e-4a88-a7cc-0695fa6b5153/720p/video.m3u8	30.0 s	1.2 KiB
vz-8bbc7bbf-a1e.b-cdn.net/e921c045-0f6e-4a88-a7cc-0695fa6b5153/480p/video.m3u8	30.0 s	1.2 KiB
vz-8bbc7bbf-a1e.b-cdn.net/a442ca3a-9e00-40c5-8a76-33ee6472d589/720p/video.m3u8	30.0 s	1.1 KiB
vz-8bbc7bbf-a1e.b-cdn.net/a442ca3a-9e00-40c5-8a76-33ee6472d589/480p/video.m3u8	30.0 s	1.1 KiB
vz-8bbc7bbf-a1e.b-cdn.net/44455006-1a54-4b23-bfe8-c6187b9478d5/playlist.m3u8	30.0 s	1.0 KiB
vz-8bbc7bbf-a1e.b-cdn.net/bde3fe3d-fa23-4257-b5bb-c42dfa9086eb/playlist.m3u8	30.0 s	1.0 KiB
vz-8bbc7bbf-a1e.b-cdn.net/42e70133-846c-4d82-b891-6715daa034dc/playlist.m3u8	30.0 s	1.0 KiB
vz-8bbc7bbf-a1e.b-cdn.net/a442ca3a-9e00-40c5-8a76-33ee6472d589/playlist.m3u8	30.0 s	1.0 KiB
vz-8bbc7bbf-a1e.b-cdn.net/7740cf90-8213-4c38-8b2f-68813d73045d/playlist.m3u8	30.0 s	1.0 KiB
vz-8bbc7bbf-a1e.b-cdn.net/a1599794-4c67-4c14-9161-d08bf188b37c/playlist.m3u8	30.0 s	1.0 KiB
vz-8bbc7bbf-a1e.b-cdn.net/d8644e4c-8639-4796-b1fa-8eacec07c26a/playlist.m3u8	30.0 s	1.0 KiB
vz-8bbc7bbf-a1e.b-cdn.net/e921c045-0f6e-4a88-a7cc-0695fa6b5153/playlist.m3u8	30.0 s	1.0 KiB
vz-8bbc7bbf-a1e.b-cdn.net/49a16d6c-9839-438c-a814-ee646f5b515f/playlist.m3u8	30.0 s	926 B
vz-8bbc7bbf-a1e.b-cdn.net/c0618340-2751-4cb8-bcbd-3992c694dac3/playlist.m3u8	30.0 s	926 B
cdn.rudderlabs.com/3.21.0/modern/plugins/rsa-plugins.js	3600.0 s	990 B

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:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:158.907 source:map[column:137513 line:1 type:source-location url:https://www.ted.com/_next/static/chunks/0ceke3n72t5kx.js urlProvider:network]]]

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

items: [map[reflowTime:79.584 source:map[column:4871 line:0 type:source-location url:https://www.ted.com/_next/static/chunks/0ez-x3h3dxkrv.js urlProvider:network]] map[reflowTime:109.165 source:map[column:26857 line:0 type:source-location url:https://www.ted.com/_next/static/chunks/0ez-x3h3dxkrv.js urlProvider:network]] map[reflowTime:1.095 source:map[column:33340 line:0 type:source-location url:https://www.ted.com/_next/static/chunks/0ez-x3h3dxkrv.js urlProvider:network]] map[reflowTime:1.632 source:map[column:34152 line:0 type:source-location url:https://www.ted.com/_next/static/chunks/12yqivmg51ele.js urlProvider:network]] map[reflowTime:3.295 source:map[column:27358 line:0 type:source-location url:https://www.ted.com/_next/static/chunks/0ez-x3h3dxkrv.js urlProvider:network]] map[reflowTime:9.099 source:map[column:169304 line:2 type:source-location url:https://cdn.fundraiseup.com/widget/AVFWZGUV urlProvider:network]] map[reflowTime:62.697 source:map[type:text value:[unattributed]]] map[reflowTime:2.441 source:map[column:26 line:803 type:source-location url:https://media.begenuin.com/sdk/chunks/vendor-external-O5cr870B.js urlProvider:network]] map[reflowTime:20.363 source:map[column:40 line:8184 type:source-location url:https://media.begenuin.com/sdk/chunks/vendor-animation-Cov7gVAf.js urlProvider:network]] map[reflowTime:18.691 source:map[column:86 line:8419 type:source-location url:https://media.begenuin.com/sdk/chunks/vendor-animation-Cov7gVAf.js urlProvider:network]] map[reflowTime:20.839 source:map[column:15 line:7691 type:source-location url:https://media.begenuin.com/sdk/chunks/feed-C4rzC3fy.js urlProvider:network]] map[reflowTime:8.107 source:map[column:20327 line:0 type:source-location url:https://www.ted.com/_next/static/chunks/0ez-x3h3dxkrv.js urlProvider:network]]]

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: Civilization on the Moon — and what it means for life on Earth

path: 1,HTML,1,BODY,1,DIV,1,DIV,1,DIV,1,MAIN,0,DIV,0,SECTION,0,SECTION,0,DIV,1,DIV,1,DIV,0,DIV,0,A,0,IMG

selector: div.swiper-slide > div.relative > a.block > img.object-cover

snippet: <img alt="Civilization on the Moon — and what it means for life on Earth" loading="eager" decoding="async" data-nimg="fill" class="object-cover object-top" sizes="(min-width: 1920px) 33vw, (min-width: 1024px) 50vw, (min-width: 768px) 66v…" srcset="https://pi.tedcdn.com/r/talkstar-photos.s3.amazonaws.com/uploads/89b644f0-…" src="https://pi.tedcdn.com/r/talkstar-photos.s3.amazonaws.com/uploads/89b644f0-…" style="position: absolute; height: 100%; width: 100%; inset: 0px;">

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

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
ak.sail-horizon.com/spm/spm.v1.min.js	55.2 KiB	1.5 s

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.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto `div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto`	/7740cf90-8213-4c38-8b2f-68813d73045d/thumbnail_47deaab8.jpg	424.3 KiB	382.0 KiB
div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto `div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto`	/bde3fe3d-fa23-4257-b5bb-c42dfa9086eb/thumbnail_12373bac.jpg	420.2 KiB	377.9 KiB
div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto `div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto`	/d8644e4c-8639-4796-b1fa-8eacec07c26a/thumbnail_830e788d.jpg	418.8 KiB	376.5 KiB
div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto `div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto`	/a442ca3a-9e00-40c5-8a76-33ee6472d589/thumbnail_b0c7edff.jpg	406.4 KiB	364.1 KiB
div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto `div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto`	/c0618340-2751-4cb8-bcbd-3992c694dac3/thumbnail_e067781e.jpg	381.2 KiB	339.0 KiB
div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto `div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto`	/a1599794-4c67-4c14-9161-d08bf188b37c/thumbnail_5ab14752.jpg	424.3 KiB	317.4 KiB
div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto `div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto`	/44455006-1a54-4b23-bfe8-c6187b9478d5/thumbnail_d2276f67.jpg	419.2 KiB	312.3 KiB
div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto `div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto`	/49a16d6c-9839-438c-a814-ee646f5b515f/thumbnail_9a7724e0.jpg	410.9 KiB	304.0 KiB
div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto `div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto`	/e921c045-0f6e-4a88-a7cc-0695fa6b5153/thumbnail_b29f394e.jpg	405.9 KiB	299.0 KiB
div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto `div.swiper-slide > div.gencl:h-full > div.gencl:relative > video.gencl:w-auto`	/42e70133-846c-4d82-b891-6715daa034dc/thumbnail_7bf13db5.jpg	377.2 KiB	270.3 KiB
stephanie_h_smith_the_haunting_history_of_the_paris_catacombs `a.relative > div.relative > div.aspect-h-9 > img.object-cover`	/r/talkstar-assets.s3.amazonaws.com/production/talks/talk...	21.4 KiB	7.9 KiB
How to make your idea impossible to ignore `div.swiper-slide > div.relative > a.block > img.object-cover`	/r/talkstar-assets.s3.amazonaws.com/production/talks/talk...	61.3 KiB	6.0 KiB
ted_idea_search_how_to_change_someone_s_perspective `a.relative > div.relative > div.aspect-h-9 > img.object-cover`	/r/talkstar-assets.s3.amazonaws.com/production/talks/talk...	19.5 KiB	6.0 KiB

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

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

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: 640 ms 49.4 KiB

URL	Transfer Size	Est Savings
www.ted.com/_next/static/chunks/0n0wbzcutlqve.css	50.8 KiB	49.4 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: 880 ms 1.8 MiB

URL	Transfer Size	Est Savings
static.fundraiseup.com/checkout.098fc4d30f8503a0.js	396.8 KiB	354.5 KiB
media.begenuin.com/sdk/chunks/feed-C4rzC3fy.js	194.7 KiB	172.3 KiB
media.begenuin.com/sdk/chunks/index-8EYXbSqT.js	285.8 KiB	159.8 KiB
cdn.yourbow.com/ted/hbyb.js	195.8 KiB	139.7 KiB
/pagead/managed/js/gpt/m202603310101/pubads_impl.js	182.4 KiB	126.0 KiB
media.begenuin.com/sdk/chunks/vendor-forms-BRAWdd6O.js	159.0 KiB	119.5 KiB
static.fundraiseup.com/checkout-sentry-vendor.dda4c7629502a974.js	111.7 KiB	111.7 KiB
media.begenuin.com/sdk/chunks/vendor-animation-Cov7gVAf.js	130.2 KiB	99.4 KiB
static.fundraiseup.com/checkout-vendors.78ab7844d94042df.js	105.2 KiB	87.3 KiB
www.ted.com/_next/static/chunks/03515l8a52213.js	83.8 KiB	61.9 KiB
media.begenuin.com/sdk/chunks/vendor-radix-pOLIplXM.js	54.5 KiB	48.4 KiB
www.ted.com/_next/static/chunks/0huhu2townkqs.js	70.0 KiB	45.5 KiB
www.ted.com/_next/static/chunks/0qsx.-_r~wvh_.js	35.3 KiB	35.1 KiB
ak.sail-horizon.com/spm/spm.v1.min.js	54.8 KiB	33.1 KiB
www.ted.com/_next/static/chunks/04.r1oawx08nq.js	50.9 KiB	32.0 KiB
media.begenuin.com/sdk/chunks/vendor-external-O5cr870B.js	74.5 KiB	26.6 KiB
cdn.fundraiseup.com/widget/AVFWZGUV	68.6 KiB	26.1 KiB
media.begenuin.com/sdk/chunks/vendor-utils-CoqRx-ES.js	73.9 KiB	24.3 KiB
media.begenuin.com/sdk/chunks/vendor-react-query-Cdnp5BQu.js	45.6 KiB	24.0 KiB
static.fundraiseup.com/checkout-styles.17c762c93d89a7dd.js	22.1 KiB	22.1 KiB
b-code.liadm.com/a-091g.min.js	46.6 KiB	21.9 KiB
www.ted.com/_next/static/chunks/0r4mnruw7f0l0.js	38.7 KiB	20.5 KiB
static.fundraiseup.com/1a7e238f14ca.elementsApi.js	37.1 KiB	20.4 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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
Unattributable	6.1 s	213 ms	0.0 ms
www.ted.com/_next/static/chunks/0ujyvbd_j_-yn.js	4.6 s	310 ms	10 ms
www.ted.com/_next/static/chunks/0ceke3n72t5kx.js	4.1 s	2.4 s	26 ms
www.ted.com/	3.5 s	81 ms	8.3 ms
cmp.osano.com/AzqTgHUHUGJa7gInt/9e4d9097-fa02-474b-9ac9-958cf3f54337/osano.js	1.8 s	1.3 s	30 ms
www.ted.com/_next/static/chunks/0.jna.w-3mqdg.js	1.6 s	1.1 s	0.4 ms
www.ted.com/_next/static/chunks/turbopack-0wz1ql9lnw2yx.js	891 ms	884 ms	1.8 ms
www.ted.com/_next/static/chunks/0g32t8vp0x1r6.js	856 ms	549 ms	2.1 ms
media.begenuin.com/sdk/chunks/index-8EYXbSqT.js	851 ms	603 ms	7.2 ms
media.begenuin.com/sdk/chunks/vendor-external-O5cr870B.js	722 ms	468 ms	1.8 ms
www.ted.com/_next/static/chunks/turbopack-0ij34tcl~3kf8.js	652 ms	614 ms	1.6 ms
www.ted.com/_next/static/chunks/0r4mnruw7f0l0.js	638 ms	124 ms	17 ms
cdn.yourbow.com/ted/hbyb.js	551 ms	464 ms	84 ms
/pagead/managed/js/gpt/m202603310101/pubads_impl.js	467 ms	385 ms	79 ms
www.ted.com/_next/static/chunks/0ku8i~ce5wfyc.js	406 ms	221 ms	0.9 ms
static.fundraiseup.com/checkout-vendors.78ab7844d94042df.js	363 ms	323 ms	39 ms
cdn.fundraiseup.com/widget/AVFWZGUV	336 ms	261 ms	34 ms
static.fundraiseup.com/checkout.098fc4d30f8503a0.js	279 ms	3.1 ms	275 ms
static.cdn.prismic.io/prismic.js?new=true&repo=tedconf	274 ms	266 ms	4.2 ms
www.ted.com/_next/static/chunks/14xs2sw89b2_l.js	235 ms	205 ms	11 ms
www.ted.com/_next/static/chunks/0ez-x3h3dxkrv.js	207 ms	58 ms	11 ms
ak.sail-horizon.com/spm/spm.v1.min.js	202 ms	139 ms	22 ms
www.ted.com/_next/static/chunks/0huhu2townkqs.js	199 ms	149 ms	50 ms
securepubads.g.doubleclick.net/tag/js/gpt.js	139 ms	123 ms	15 ms
www.ted.com/_next/static/chunks/00e0.1-7ldep6.js	128 ms	124 ms	1.3 ms
static.fundraiseup.com/1a7e238f14ca.elementsApi.js	127 ms	103 ms	17 ms
b-code.liadm.com/a-091g.min.js	112 ms	92 ms	19 ms
www.ted.com/_next/static/chunks/0n0wbzcutlqve.css	93 ms	0.0 ms	0.0 ms
www.ted.com/_next/static/chunks/0.mqsbzt-om0r.js	92 ms	86 ms	0.6 ms
www.ted.com/_next/static/chunks/0mp.pzycqqn0q.js	90 ms	87 ms	0.9 ms
cmp.osano.com/AzqTgHUHUGJa7gInt/9e4d9097-fa02-474b-9ac9-958cf3f54337/osano-ui.js	84 ms	48 ms	16 ms
www.ted.com/_next/static/chunks/114-_~-gmr6~n.js	81 ms	76 ms	2.6 ms
www.ted.com/_next/static/chunks/075sn8uv1jrmg.js	76 ms	74 ms	1.2 ms
www.ted.com/_next/static/chunks/0j5dxic8qrkqa.js	70 ms	63 ms	0.6 ms
www.ted.com/_next/static/chunks/03515l8a52213.js	65 ms	5.5 ms	56 ms
www.ted.com/_next/static/chunks/0ca7ic43xt64o.js	56 ms	26 ms	5.3 ms
www.ted.com/_next/static/chunks/0jz52-v-k35hq.js	52 ms	48 ms	0.6 ms
www.ted.com/_next/static/chunks/0culyoxm4rnl-.js	50 ms	3.7 ms	45 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	12.7 s
Other	11.9 s
Style & Layout	4.4 s
Script Parsing & Compilation	1.3 s
Rendering	1.3 s
Garbage Collection	338 ms
Parse HTML & CSS	279 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 326.8 KiB

URL	Transfer Size	Est Savings
media.begenuin.com/sdk/chunks/index-8EYXbSqT.js	285.8 KiB	97.5 KiB
media.begenuin.com/sdk/chunks/feed-C4rzC3fy.js	194.7 KiB	68.4 KiB
media.begenuin.com/sdk/chunks/vendor-forms-BRAWdd6O.js	159.0 KiB	41.1 KiB
media.begenuin.com/sdk/chunks/vendor-animation-Cov7gVAf.js	130.2 KiB	32.3 KiB
media.begenuin.com/sdk/chunks/vendor-utils-CoqRx-ES.js	73.9 KiB	28.4 KiB
media.begenuin.com/sdk/chunks/vendor-external-O5cr870B.js	74.5 KiB	22.0 KiB
media.begenuin.com/sdk/chunks/vendor-radix-pOLIplXM.js	54.5 KiB	19.0 KiB
media.begenuin.com/sdk/chunks/vendor-react-query-Cdnp5BQu.js	45.6 KiB	13.6 KiB
media.begenuin.com/sdk/chunks/embed-YjuMENHE.js	12.0 KiB	4.5 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
vz-8bbc7bbf-a1e.b-cdn.net/bde3fe3d-fa23-4257-b5bb-c42dfa9086eb/1080p/video2.ts	1.4 MiB
vz-8bbc7bbf-a1e.b-cdn.net/bde3fe3d-fa23-4257-b5bb-c42dfa9086eb/1080p/video1.ts	1.2 MiB
vz-8bbc7bbf-a1e.b-cdn.net/c0618340-2751-4cb8-bcbd-3992c694dac3/720p/video2.ts	895.4 KiB
vz-8bbc7bbf-a1e.b-cdn.net/d8644e4c-8639-4796-b1fa-8eacec07c26a/480p/video2.ts	779.0 KiB
vz-8bbc7bbf-a1e.b-cdn.net/d8644e4c-8639-4796-b1fa-8eacec07c26a/480p/video0.ts	741.9 KiB
vz-8bbc7bbf-a1e.b-cdn.net/49a16d6c-9839-438c-a814-ee646f5b515f/720p/video2.ts	735.1 KiB
vz-8bbc7bbf-a1e.b-cdn.net/e921c045-0f6e-4a88-a7cc-0695fa6b5153/480p/video1.ts	726.6 KiB
vz-8bbc7bbf-a1e.b-cdn.net/e921c045-0f6e-4a88-a7cc-0695fa6b5153/480p/video2.ts	669.9 KiB
vz-8bbc7bbf-a1e.b-cdn.net/d8644e4c-8639-4796-b1fa-8eacec07c26a/480p/video1.ts	653.9 KiB
vz-8bbc7bbf-a1e.b-cdn.net/c0618340-2751-4cb8-bcbd-3992c694dac3/480p/video1.ts	564.4 KiB

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

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Font display

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●User Timing marks and measures 16 user timings

●Avoid long main-thread tasks 20 long tasks found

●Avoid non-composited animations 1 animated element found

●Image elements have explicit `width` and `height`

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 260 ms

●Server Backend Latencies 400 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 30 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

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.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div#hero-slider-images > div.cloned-standard-hero-slider-nav-prev > div.absolute > button.group `div#hero-slider-images > div.cloned-standard-hero-slider-nav-prev > div.absolute > button.group`
div#hero-slider-images > div.cloned-standard-hero-slider-nav-next > div.absolute > button.group `div#hero-slider-images > div.cloned-standard-hero-slider-nav-next > div.absolute > button.group`
div.gencl:absolute > div.gencl:absolute > div.gencl:flex > button.gencl:inline-flex `div.gencl:absolute > div.gencl:absolute > div.gencl:flex > button.gencl:inline-flex`
div.gencl:absolute > div.gencl:absolute > div.gencl:flex > button.gencl:inline-flex `div.gencl:absolute > div.gencl:absolute > div.gencl:flex > button.gencl:inline-flex`
div.gencl:absolute > div.gencl:absolute > div.gencl:flex > button.gencl:inline-flex `div.gencl:absolute > div.gencl:absolute > div.gencl:flex > button.gencl:inline-flex`
body.antialiased > section#sailthru-overlay-container > div.sailthru-overlay > button.sailthru-overlay-close `body.antialiased > section#sailthru-overlay-container > div.sailthru-overlay > button.sailthru-overlay-close`

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.flex > div.mb-8 > div.relative > input.newsletter-input `div.flex > div.mb-8 > div.relative > input.newsletter-input`

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.mx-auto > div.flex > div.h-100 > a `div.mx-auto > div.flex > div.h-100 > a`
div.mx-auto > div.flex > div.h-100 > a `div.mx-auto > div.flex > div.h-100 > a`

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

Best practices

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
head > meta `head > meta`

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
HEALTH `div.flex > div.flex > div.flex > a.relative`
SOCIAL CHANGE `div.flex > div.flex > div.flex > a.relative`
CULTURE `div.flex > div.flex > div.flex > a.relative`
CULTURE `div.flex > div.flex > div.flex > a.relative`
PHILOSOPHY `div.flex > div.flex > div.flex > a.relative`
ACTIVISM `div.flex > div.flex > div.flex > a.relative`
CULTURE `div.flex > div.grid > div.flex > a.relative`
CULTURE `div.flex > div.grid > div.flex > a.relative`
SOCIAL CHANGE `div.flex > div.grid > div.flex > a.relative`
SOCIAL CHANGE `div.flex > div.grid > div.flex > a.relative`
CULTURE `div.flex > div.grid > div.flex > a.relative`
HEALTH `div.flex > div.grid > div.flex > a.relative`

These items highlight common accessibility best practices.

○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

●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

●`[role]` values are valid

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

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

●Image elements have `[alt]` attributes

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

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

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

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●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.

●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

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

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

●Identical links have the same purpose.

○`[accesskey]` values are unique

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

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

○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.

○`[lang]` attributes have a valid value

○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.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

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

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

100

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.

○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 have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`