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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

8

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.

RequestCache TTLTransfer Size
www.technologyreview.com/static/js/common.9b7166d93b42278823ba.bundle.js86400.0 s278.6 KiB
www.technologyreview.com/static/js/main.20cad287747d83dccd6e.bundle.js86400.0 s251.2 KiB
/dvbm.js900.0 s101.7 KiB
cdn-piano.technologyreview.com/api/tinypass.min.js14400.0 s132.7 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s73.1 KiB
/signals/config/1036696610281117?v=2.9.303&r=c2&domain=ww...1200.0 s45.2 KiB
cdn.cookielaw.org/scripttemplates/6.33.0/otBannerSdk.js86400.0 s79.9 KiB
ml314.com/tag.aspx?2133600.0 s38.7 KiB
cdn.cxense.com/cx.js3600.0 s38.1 KiB
cdn.cxense.com/cx.js3600.0 s38.1 KiB
www.redditstatic.com/ads/pixel.js60.0 s19.0 KiB
/signals/config/1215228632762570?v=2.9.303&r=c2&domain=ww...1200.0 s16.6 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js3000.0 s14.4 KiB
pagead2.googlesyndication.com/pagead/show_companion_ad.js?fcd=true3600.0 s11.7 KiB
c.amazon-adsystem.com/aat/amzn.js0.0 ms8.9 KiB
snap.licdn.com/li.lms-analytics/insight.min.js86400.0 s18.7 KiB
bat.bing.com/p/insights/s/0.8.5986400.0 s15.6 KiB
static.hotjar.com/c/hotjar-531874.js?sv=760.0 s6.2 KiB
/ng/common/i18n/platform-translation-map_en_US.js?version...86400.0 s13.7 KiB
cdn.cxense.com/cx.cce.js3600.0 s6.8 KiB
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...604784.0 s52.9 KiB
vx-piano.technologyreview.com/widget/dist/template/css/template.bundle.1.0.css1200.0 s5.3 KiB
/showtemplate/general/loadTranslationMap?aid=WUOCNSUgpu&v...86400.0 s10.9 KiB
cdn.cookielaw.org/scripttemplates/otSDKStub.js86400.0 s9.1 KiB
vx-piano.technologyreview.com/widget/dist/template/css/img/fail-icon.png1200.0 s2.4 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg86400.0 s2.7 KiB
/rp.gif?ts=1776798815616&id=t2_25alwh0c&event=PageVisit&m...0.0 ms666 B
/collect?v=2&fmt=js&pid=2797074%2C3808058&time=1776798815...0.0 ms470 B
/Repo/rep.gif?ver=3.3.0&typ=pgv&rnd=mo904yoxzcfdp1hz&sid=...0.0 ms413 B
ps.eyeota.net/pixel/bounce/?pid=r8hrb20&t=gif0.0 ms354 B
/collect?v=2&fmt=js&pid=2797074%2C3808058&time=1776798815...0.0 ms271 B
match.adsrvr.org/track/cmb/generic?ttd_pid=d0tro1j&ttd_tpi=10.0 ms254 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js1209600.0 s1.2 KiB
/track/mntrjsAssessed?dHNjPTIwMjYtMDQtMjFUMTklM0ExMyUzQTM...0.0 ms51 B
/track/mntrjsAssessed?dHNjPTIwMjYtMDQtMjFUMTklM0ExMyUzQTM...0.0 ms50 B
/track/aamHrtBt?dHNjPTIwMjYtMDQtMjFUMTklM0ExMyUzQTM5LjgwM...0.0 ms50 B
ml314.com/csync.ashx?fp=314169462707539032&person_id=3660555640467095552&eid=286385.0 s56 B
ml314.com/csync.ashx?fp=&person_id=3660555640467095552&eid=5008286386.0 s56 B
/tr/?id=1215228632762570&ev=PageView&dl=https%3A%2F%2Fwww...0.0 ms19 B
/tr/?id=1036696610281117&ev=PageView&dl=https%3A%2F%2Fwww...0.0 ms16 B
/a?v=3&t=l&pid=296165496&rv=64h1&tag_exp=0~115616985~1159...0.0 ms11 B
/dvbm.js900.0 s0 B
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s0 B
/pagead/managed/js/activeview/current/ufs_web_display.js3600.0 s0 B
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...604784.0 s0 B
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...604784.0 s0 B
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...604784.0 s0 B
/ng/common/i18n/platform-translation-map_en_US.js?version...86400.0 s0 B
/ng/common/i18n/platform-translation-map_en_US.js?version...86400.0 s0 B
/ng/common/i18n/platform-translation-map_en_US.js?version...86400.0 s0 B
/showtemplate/general/loadTranslationMap?aid=WUOCNSUgpu&v...86400.0 s0 B
/showtemplate/general/loadTranslationMap?aid=WUOCNSUgpu&v...86400.0 s0 B
/showtemplate/general/loadTranslationMap?aid=WUOCNSUgpu&v...86400.0 s0 B
ep2.adtrafficquality.google/sodar/VFc2VJAc.js3000.0 s0 B
vx-piano.technologyreview.com/widget/dist/template/css/template.bundle.1.0.css1200.0 s0 B
vx-piano.technologyreview.com/widget/dist/template/css/template.bundle.1.0.css1200.0 s0 B
vx-piano.technologyreview.com/widget/dist/template/css/template.bundle.1.0.css1200.0 s0 B
vx-piano.technologyreview.com/widget/dist/template/css/img/fail-icon.png1200.0 s0 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:0.51179] map[node:map[boundingRect:map[bottom:436 height:436 left:21 right:391 top:0 width:371] lhId:page-0-ARTICLE nodeLabel:Save 25% today 10 Things That Matter in AI Right Now Subscribe to gain access … path:5,HTML,2,BODY,1,DIV,1,DIV,1,DIV,1,ARTICLE selector:div#template-container > div.showTemplate > div > article.pn-article snippet:<article class="pn-article"> type:node] score:0.361521] map[node:map[boundingRect:map[bottom:1126 height:353 left:20 right:392 top:773 width:372] lhId:page-1-DIV nodeLabel:Artificial intelligence1 month OpenAI is throwing everything into building a fu… path:1,HTML,1,BODY,1,DIV,0,DIV,4,MAIN,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV selector:div.heroSection__posts--e13b0a10ab98067f42a787976b67b6b1 > div.heroSection__rightColumn--c3ab7094c2e320b9483cc585efa2ba2e > div.heroSection__carousel--7bd1202ea66026cf44757660ba833d04 > div#heroCarousel_01 snippet:<div class="swiper-container swiper-container-initialized swiper-container-horizontal …" id="heroCarousel_01" aria-atomic="false"> type:node] score:0.058188] map[node:map[boundingRect:map[bottom:24001 height:23805 left:0 right:412 top:196 width:412] lhId:page-2-MAIN nodeLabel:Featured Story NewBiotechnology and health1 day Colossal Biosciences said it cl… path:1,HTML,1,BODY,1,DIV,0,DIV,4,MAIN selector:body.body--homepage-version > div#root > div.app__wrapper--51ab29241886af9c7226d4278c9cfd47 > main#content snippet:<main class="body__content--597fb71d59d8975bccef28840f85a602 body__wrapper--7cdcb85e771…" id="content"> type:node] score:0.037096] map[node:map[boundingRect:map[bottom:1126 height:353 left:20 right:392 top:773 width:372] lhId:page-1-DIV nodeLabel:Artificial intelligence1 month OpenAI is throwing everything into building a fu… path:1,HTML,1,BODY,1,DIV,0,DIV,4,MAIN,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV selector:div.heroSection__posts--e13b0a10ab98067f42a787976b67b6b1 > div.heroSection__rightColumn--c3ab7094c2e320b9483cc585efa2ba2e > div.heroSection__carousel--7bd1202ea66026cf44757660ba833d04 > div#heroCarousel_01 snippet:<div class="swiper-container swiper-container-initialized swiper-container-horizontal …" id="heroCarousel_01" aria-atomic="false"> type:node] score:0.023995] map[node:map[boundingRect:map[bottom:24001 height:23805 left:0 right:412 top:196 width:412] lhId:page-2-MAIN nodeLabel:Featured Story NewBiotechnology and health1 day Colossal Biosciences said it cl… path:1,HTML,1,BODY,1,DIV,0,DIV,4,MAIN selector:body.body--homepage-version > div#root > div.app__wrapper--51ab29241886af9c7226d4278c9cfd47 > main#content snippet:<main class="body__content--597fb71d59d8975bccef28840f85a602 body__wrapper--7cdcb85e771…" id="content"> type:node] score:0.019158]]

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.

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:44.715 source:map[column:127245 line:1 type:source-location url:https://cdn-piano.technologyreview.com/api/tinypass.min.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:119.787 source:map[type:text value:[unattributed]]] map[reflowTime:29.615 source:map[column:408972 line:1 type:source-location url:https://www.technologyreview.com/static/js/common.9b7166d93b42278823ba.bundle.js urlProvider:network]] map[reflowTime:5.808 source:map[column:871934 line:1 type:source-location url:https://www.technologyreview.com/static/js/common.9b7166d93b42278823ba.bundle.js urlProvider:network]] map[reflowTime:3.316 source:map[column:971235 line:1 type:source-location url:https://www.technologyreview.com/static/js/common.9b7166d93b42278823ba.bundle.js urlProvider:network]] map[reflowTime:2.638 source:map[column:913878 line:1 type:source-location url:https://www.technologyreview.com/static/js/common.9b7166d93b42278823ba.bundle.js urlProvider:network]] map[reflowTime:1.291 source:map[column:235689 line:1 type:source-location url:https://www.technologyreview.com/static/js/main.20cad287747d83dccd6e.bundle.js urlProvider:network]] map[reflowTime:44.715 source:map[column:297534 line:0 type:source-location url:https://cdn-piano.technologyreview.com/api/tinypass.min.js urlProvider:network]]]

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:577.85 label:Time to first byte subpart:timeToFirstByte] map[duration:1118.926 label:Resource load delay subpart:resourceLoadDelay] map[duration:164.956 label:Resource load duration subpart:resourceLoadDuration] map[duration:1090.324 label:Element render delay subpart:elementRenderDelay]]
lhId: page-0-IMG
nodeLabel: a wolf pup chews on a terrycloth toy
path: 1,HTML,1,BODY,1,DIV,0,DIV,4,MAIN,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,1,DIV,0,DIV,0,A,0,FIGURE,0,SPAN,0,SPAN,0,IMG
selector: figure > span.image__wrapper--373a87c0cefdc42b3a8bd26457571412 > span.lazy-load-image-background > img.image__img--e1a73f503bf0f4a3d2504e1d64ea29cb
snippet: <img src="https://wp.technologyreview.com/wp-content/uploads/2026/04/2412_GW_2Month_…" srcset="https://wp.technologyreview.com/wp-content/uploads/2026/04/2412_GW_2Month_…" sizes="(max-width: 32rem) 295px,540px" alt="a wolf pup chews on a terrycloth toy" class="image__img--e1a73f503bf0f4a3d2504e1d64ea29cb imgLazyLoaded">

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: a wolf pup chews on a terrycloth toy
path: 1,HTML,1,BODY,1,DIV,0,DIV,4,MAIN,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,1,DIV,0,DIV,0,A,0,FIGURE,0,SPAN,0,SPAN,0,IMG
selector: figure > span.image__wrapper--373a87c0cefdc42b3a8bd26457571412 > span.lazy-load-image-background > img.image__img--e1a73f503bf0f4a3d2504e1d64ea29cb
snippet: <img src="https://wp.technologyreview.com/wp-content/uploads/2026/04/2412_GW_2Month_…" srcset="https://wp.technologyreview.com/wp-content/uploads/2026/04/2412_GW_2Month_…" sizes="(max-width: 32rem) 295px,540px" alt="a wolf pup chews on a terrycloth toy" class="image__img--e1a73f503bf0f4a3d2504e1d64ea29cb imgLazyLoaded">

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
value: no origins were preconnected
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates

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.

URLEst Savings
www.technologyreview.com/cdn/_/fonts/TRMono/TRMono-Regular.otf20 ms
www.technologyreview.com/cdn/_/fonts/NeueHaasText/NHaasGroteskTXStd-75Bd.woff220 ms
www.technologyreview.com/cdn/_/fonts/NeueHaasText/NHaasGroteskTXStd-56It.woff215 ms
www.technologyreview.com/cdn/_/fonts/NeueHaas/nhaasgroteskdsstd-65md.woff10 ms
www.technologyreview.com/cdn/_/fonts/NeueHaasText/NHaasGroteskTXStd-55Rg.woff210 ms
www.technologyreview.com/cdn/_/fonts/NeueHaas/nhaasgroteskdsstd-55rg.woff5.0 ms
www.technologyreview.com/cdn/_/fonts/NeueHaas/nhaasgroteskdsstd-75bd.woff5.0 ms

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.

URLResource SizeEst Savings
body > div.GoogleActiveViewElement > a > img body > div.GoogleActiveViewElement > a > img
tpc.googlesyndication.com/simgad/14379935071582012471?15.3 KiB10.1 KiB
a line of soldiers aiming their weapons fading into a pattern of cubes a > span.image__wrapper--373a87c0cefdc42b3a8bd26457571412 > span.lazy-load-image-background > img.image__img--e1a73f503bf0f4a3d2504e1d64ea29cb
/wp-content/uploads/2026/04/human-war-loop2.jpg?fit=590,1...41.0 KiB9.2 KiB
a wolf pup chews on a terrycloth toy figure > span.image__wrapper--373a87c0cefdc42b3a8bd26457571412 > span.lazy-load-image-background > img.image__img--e1a73f503bf0f4a3d2504e1d64ea29cb
/wp-content/uploads/2026/04/2412_GW_2Month_2_1.jpg?fit=54...32.2 KiB5.5 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.

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: 1.9 s
URLTime Spent
technologyreview.com/848 ms
www.technologyreview.com/1.1 s
www.technologyreview.com/0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
Save 25% today 10 Things That Matter in AI Right Now Subscribe to gain access … div#template-container > div.showTemplate > div > article.pn-article
0.362
Artificial intelligence1 month OpenAI is throwing everything into building a fu… div.heroSection__posts--e13b0a10ab98067f42a787976b67b6b1 > div.heroSection__rightColumn--c3ab7094c2e320b9483cc585efa2ba2e > div.heroSection__carousel--7bd1202ea66026cf44757660ba833d04 > div#heroCarousel_01
0.058
Featured Story NewBiotechnology and health1 day Colossal Biosciences said it cl… body.body--homepage-version > div#root > div.app__wrapper--51ab29241886af9c7226d4278c9cfd47 > main#content
0.037
Artificial intelligence1 month OpenAI is throwing everything into building a fu… div.heroSection__posts--e13b0a10ab98067f42a787976b67b6b1 > div.heroSection__rightColumn--c3ab7094c2e320b9483cc585efa2ba2e > div.heroSection__carousel--7bd1202ea66026cf44757660ba833d04 > div#heroCarousel_01
0.024
Featured Story NewBiotechnology and health1 day Colossal Biosciences said it cl… body.body--homepage-version > div#root > div.app__wrapper--51ab29241886af9c7226d4278c9cfd47 > main#content
0.019
Artificial intelligence1 month OpenAI is throwing everything into building a fu… div.heroSection__posts--e13b0a10ab98067f42a787976b67b6b1 > div.heroSection__rightColumn--c3ab7094c2e320b9483cc585efa2ba2e > div.heroSection__carousel--7bd1202ea66026cf44757660ba833d04 > div#heroCarousel_01
0.011
div.showTemplate > div > a.pn-article__cta > ::after div.showTemplate > div > a.pn-article__cta > ::after
0.001
div.showTemplate > div > a.pn-article__cta > ::after div.showTemplate > div > a.pn-article__cta > ::after
0.000
div.showTemplate > div > a.pn-article__cta > ::after div.showTemplate > div > a.pn-article__cta > ::after
0.000
Lock in 25% savings + free tote div.pn-article__copy-wrapper > strong.pn-article__title > span > span
0.000

Diagnostics

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: 2.8 s 1.1 MiB
URLTransfer SizeEst Savings
www.technologyreview.com/static/js/common.9b7166d93b42278823ba.bundle.js277.0 KiB121.7 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js187.7 KiB95.9 KiB
www.googletagmanager.com/gtag/js?id=G-XEGTFKJZ9W&cx=c&gtm=4e64h1172.6 KiB78.7 KiB
www.technologyreview.com/static/js/main.20cad287747d83dccd6e.bundle.js250.8 KiB74.1 KiB
www.googletagmanager.com/gtag/js?id=G-CV8ZC5Z6LR&cx=c&gtm=4e64h1174.3 KiB67.9 KiB
cdn-piano.technologyreview.com/api/tinypass.min.js132.1 KiB66.5 KiB
www.googletagmanager.com/gtag/destination?id=AW-940506728&cx=c&gtm=4e64h1146.4 KiB58.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-TRBQMN173.7 KiB58.1 KiB
cdn.cookielaw.org/scripttemplates/6.33.0/otBannerSdk.js79.6 KiB41.2 KiB
cdn.doubleverify.com/dvbm.js101.4 KiB40.0 KiB
cdn.doubleverify.com/dvbm.js101.4 KiB39.6 KiB
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...52.7 KiB36.8 KiB
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...52.7 KiB36.8 KiB
fundingchoicesmessages.google.com/i/3293?ers=368.5 KiB36.4 KiB
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...52.7 KiB36.4 KiB
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...52.7 KiB36.3 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB33.5 KiB
pagead2.googlesyndication.com/pagead/js/adsbygoogle.js54.1 KiB33.5 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.1 KiB31.0 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.1 KiB30.9 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js73.1 KiB30.2 KiB
cdn.cxense.com/cx.js37.5 KiB21.8 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.

URLTotal CPU TimeScript EvaluationScript Parse
www.technologyreview.com/2.1 s27 ms54 ms
Unattributable1.9 s423 ms0.0 ms
www.technologyreview.com/static/js/common.9b7166d93b42278823ba.bundle.js1.6 s1.1 s121 ms
www.technologyreview.com/static/js/main.20cad287747d83dccd6e.bundle.js1.6 s1.3 s230 ms
cdn-piano.technologyreview.com/api/tinypass.min.js1.5 s1.0 s58 ms
cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js1.4 s931 ms85 ms
/pagead/managed/js/gpt/m202604160201/pubads_impl.js1.3 s1.1 s120 ms
cdn.doubleverify.com/dvbm.js1.2 s1.0 s85 ms
/aam?asid=cQ3ySBSu&af=320x100&ad=253869258&adv=4858144078...963 ms218 ms6.8 ms
/pagead/managed/js/activeview/current/ufs_web_display.js955 ms845 ms69 ms
www.googletagmanager.com/gtm.js?id=GTM-TRBQMN916 ms786 ms87 ms
www.googletagmanager.com/gtag/js?id=G-CV8ZC5Z6LR&cx=c&gtm=4e64h1841 ms743 ms79 ms
cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.22/angular.min.js681 ms560 ms65 ms
fundingchoicesmessages.google.com/i/3293?ers=3626 ms601 ms20 ms
/checkout/template/cacheableShow.html?aid=WUOCNSUgpu&temp...446 ms9.6 ms4.5 ms
www.googletagmanager.com/gtag/destination?id=AW-940506728&cx=c&gtm=4e64h1429 ms368 ms57 ms
cdn.cxense.com/cx.js335 ms206 ms12 ms
cdn.cookielaw.org/scripttemplates/6.33.0/otBannerSdk.js334 ms197 ms31 ms
www.redditstatic.com/ads/pixel.js291 ms262 ms11 ms
www.googletagmanager.com/gtag/js?id=G-XEGTFKJZ9W&cx=c&gtm=4e64h1286 ms234 ms50 ms
/visit.js?gdpr=&gdpr_consent=&flvr=1&ttmms=11&ttfrms=36&b...242 ms237 ms0.4 ms
connect.facebook.net/en_US/fbevents.js209 ms167 ms39 ms
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...206 ms96 ms64 ms
/aam?asid=cQ3ySBSu&af=300x250&ad=253869831&adv=4858144078...202 ms183 ms6.0 ms
script.hotjar.com/modules.6a0f3932cb1341a35c18.js180 ms149 ms23 ms
/signals/config/1215228632762570?v=2.9.303&r=c2&domain=ww...136 ms121 ms8.3 ms
securepubads.g.doubleclick.net/tag/js/gpt.js121 ms110 ms11 ms
bat.bing.com/p/insights/s/0.8.59104 ms84 ms5.0 ms
snap.licdn.com/li.lms-analytics/insight.min.js100 ms61 ms29 ms
pagead2.googlesyndication.com/pagead/js/adsbygoogle.js97 ms79 ms17 ms
cdn.cookielaw.org/scripttemplates/otSDKStub.js97 ms76 ms3.1 ms
/signals/config/1036696610281117?v=2.9.303&r=c2&domain=ww...96 ms74 ms20 ms
/visit.js?gdpr=&gdpr_consent=&flvr=1&ttmms=14&ttfrms=37&b...91 ms89 ms0.4 ms
ep2.adtrafficquality.google/sodar/VFc2VJAc.js77 ms66 ms8.0 ms
ml314.com/tag.aspx?21373 ms60 ms7.2 ms
static.ads-twitter.com/uwt.js68 ms60 ms5.9 ms
ep2.adtrafficquality.google/sodar/sodar2.js63 ms56 ms2.5 ms
/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads...57 ms8.1 ms0.0 ms
/f/AGSKWxVzbbLtYulfIR39SSSe_NLjm76raYmd9_AzGG7EsXoZ5Xdvrb...54 ms42 ms0.9 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.

CategoryTime Spent
Script Evaluation14.1 s
Other3.4 s
Style & Layout1.9 s
Script Parsing & Compilation1.6 s
Rendering900 ms
Parse HTML & CSS464 ms
Garbage Collection243 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reasonFailure type
The page has an unload handler in a sub frame.Actionable

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 128.1 KiB
URLTransfer SizeEst Savings
@font-face { font-family: "Neue"; … } …30.3 KiB30.3 KiB
@font-face { font-family: "Neue"; … } …30.3 KiB28.7 KiB
.monogramTLogo{height:14px;margin-left:10px;width:14px} …22.6 KiB18.0 KiB
#onetrust-banner-sdk{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%} …16.2 KiB13.3 KiB
.monogramTLogo{height:14px;margin-left:10px;width:14px} …12.8 KiB12.8 KiB
.monogramTLogo{height:14px;margin-left:10px;width:14px} …12.5 KiB12.5 KiB
.monogramTLogo{height:14px;margin-left:10px;width:14px} …12.5 KiB12.5 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.

URLTransfer Size
/wp-content/uploads/2026/04/MIT-TR-Home-Page_Piano_AI-lis...720.7 KiB
www.technologyreview.com/static/js/common.9b7166d93b42278823ba.bundle.js278.6 KiB
www.technologyreview.com/static/js/main.20cad287747d83dccd6e.bundle.js251.2 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js187.7 KiB
www.googletagmanager.com/gtag/js?id=G-CV8ZC5Z6LR&cx=c&gtm=4e64h1174.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-TRBQMN174.0 KiB
www.googletagmanager.com/gtag/js?id=G-XEGTFKJZ9W&cx=c&gtm=4e64h1172.7 KiB
www.googletagmanager.com/gtag/destination?id=AW-940506728&cx=c&gtm=4e64h1146.5 KiB
cdn-piano.technologyreview.com/api/tinypass.min.js132.7 KiB
cdn.doubleverify.com/dvbm.js101.7 KiB

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

●Optimize DOM size
●Modern HTTP
●Render blocking requests
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 240 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`
●Network Requests
●Network Round Trip Times 110 ms
●Server Backend Latencies 140 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 460 ms
○INP breakdown
88

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

ARIA dialog elements without accessible names may prevent screen readers users from discerning the purpose of these elements. Learn how to make ARIA dialog elements more accessible.

Why this matters

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

Source: MDN Permissions-Policy

Failing Elements
body.body--homepage-version > div.tp-busy body.body--homepage-version > div.tp-busy
body.body--homepage-version > div.tp-modal > div.tp-iframe-wrapper body.body--homepage-version > div.tp-modal > div.tp-iframe-wrapper

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.

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
header.headerTemplate__container--ecd80005f4f4080205fa3a10b73ba2fd > div.headerTemplate__navigationRow--3a62ddafd8db50d42d8385fb402f956f > div.headerTemplate__rightNavHolder--da5465c8554116beccc869269e47c946 > button.headerTemplate__hamburgerIcon--0d1c332876d1598bcd81275ee2ce7a7c header.headerTemplate__container--ecd80005f4f4080205fa3a10b73ba2fd > div.headerTemplate__navigationRow--3a62ddafd8db50d42d8385fb402f956f > div.headerTemplate__rightNavHolder--da5465c8554116beccc869269e47c946 > button.headerTemplate__hamburgerIcon--0d1c332876d1598bcd81275ee2ce7a7c
body.body--homepage-version > div.tp-modal > div.tp-iframe-wrapper > button.tp-close body.body--homepage-version > div.tp-modal > div.tp-iframe-wrapper > button.tp-close

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.heroSection__leftColumn--bd04310f1ffae986372c9d3df8a58082 > div#homepage_hero_banner > div.tp-container-inner > iframe#offer_77db7b4abc203285213a-0 div.heroSection__leftColumn--bd04310f1ffae986372c9d3df8a58082 > div#homepage_hero_banner > div.tp-container-inner > iframe#offer_77db7b4abc203285213a-0
div > div#homepage_full_width > div.tp-container-inner > iframe#offer_c3c323db275cddae019e-0 div > div#homepage_full_width > div.tp-container-inner > iframe#offer_c3c323db275cddae019e-0
body.body--homepage-version > div.tp-modal > div.tp-iframe-wrapper > iframe#offer_aee99e6decef32da11da-0 body.body--homepage-version > div.tp-modal > div.tp-iframe-wrapper > iframe#offer_aee99e6decef32da11da-0

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.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
See our cookie policy div.ot-sdk-eight > div#onetrust-policy > p#onetrust-policy-text > a
○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
●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
●`[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.
●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.
●Heading elements appear in a sequentially-descending order
●Skip links are focusable.
●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
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[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
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Image elements have `[alt]` attributes
○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.
○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
○`<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.
○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 / WarningSource
Unload event listeners are deprecated and will be removed.
cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js line 1, col 8625
AttributionReporting
www.googletagmanager.com/gtag/destination?id=AW-940506728&cx=c&gtm=4e64h1 line 600, col 244
SharedStorage
/pagead/managed/js/activeview/current/ufs_web_display.js line 252, col 234

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
www.technologyreview.com/
Attestation check for Shared Storage on https://ara.paa-reporting-advertising.amazon failed.
/mittechnologyreviewdfp991240917930/moatad.js
Failed to load resource: net::ERR_NAME_NOT_RESOLVED
/mittechnologyreviewdfp991240917930/moatad.js
Failed to load resource: net::ERR_NAME_NOT_RESOLVED
/mittechnologyreviewdfp991240917930/moatad.js
Failed to load resource: net::ERR_NAME_NOT_RESOLVED
●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
●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
○Use a strong HSTS policy
○Mitigate clickjacking with XFO or CSP
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 destinationLink Text
cookiepedia.co.uk/giving-consent-to-cookiesMore information

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

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links are crawlable
●robots.txt is valid
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`
○Image elements have `[alt]` attributes

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