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

Audit breakdown by category with detailed findings.

41

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
cuhk.edu.hk/english/images/home_slide/Touch27-01.png0.0 ms2.5 MiB
cuhk.edu.hk/english/images/home_slide/Touch27-03.png0.0 ms2.0 MiB
cuhk.edu.hk/english/images/home_slide/Touch27-04.png0.0 ms1.9 MiB
cuhk.edu.hk/english/images/home_slide/Touch27-02.png0.0 ms1.9 MiB
/wp-content/uploads/submitevent/Conference-Thumbnail-aspe...0.0 ms1.7 MiB
/wp-content/uploads/submitevent/20260424_CSSL-Webinar_EN-...0.0 ms1.1 MiB
/wp-content/uploads/submitevent/PGSym2026_v3.2_Preview-4-...0.0 ms753.4 KiB
www.cpr.cuhk.edu.hk/wp-content/uploads/submitevent/20260511_event.jpg0.0 ms583.8 KiB
cuhk.edu.hk/english/images/home_slide/focus78-04.jpg0.0 ms472.7 KiB
cuhk.edu.hk/english/images/home_slide/focus78-03.jpg0.0 ms410.1 KiB
cuhk.edu.hk/english/images/home_slide/focus78-01a.jpg0.0 ms292.3 KiB
cuhk.edu.hk/english/images/whats_on/home/x150/cuvisuals1.jpg0.0 ms246.2 KiB
cuhk.edu.hk/english/js/jquery-ui-1.9.0.custom.min.js0.0 ms230.6 KiB
cuhk.edu.hk/english/images/home_slide/focus78-02.jpg0.0 ms229.6 KiB
cuhk.edu.hk/english/fonts/Basel-Grotesk-Light.otf0.0 ms220.1 KiB
cuhk.edu.hk/english/images/whats_on/home/x150/focus78-01.jpg0.0 ms117.3 KiB
cuhk.edu.hk/english/css/bootstrap.min.css0.0 ms114.7 KiB
cuhk.edu.hk/english/js/jquery.min.js0.0 ms94.0 KiB
cuhk.edu.hk/english/images/others/co_logo_10years-footer.png0.0 ms92.1 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
cuhk.edu.hk/english/images/others/website-elderly-friendly_2025-footer.png0.0 ms72.0 KiB
connect.facebook.net/en_US/bundle/sdk.js/1200.0 s77.8 KiB
cuhk.edu.hk/english/images/others/website-triple-gold_2025-footer.png0.0 ms64.3 KiB
cuhk.edu.hk/english/images/whats_on/home/x150/CUHK-Podcast_EP8_TCEN_CUTV.jpg0.0 ms56.5 KiB
cuhk.edu.hk/english/images/others/cuhk-sz-logo-2023.jpg0.0 ms45.5 KiB
cuhk.edu.hk/english/css/main.css?2026030.0 ms41.7 KiB
/signals/config/597288989049581?v=2.9.303&r=stable&domain...1200.0 s44.8 KiB
cuhk.edu.hk/english/images/others/charter-logo-footer.png0.0 ms39.0 KiB
cuhk.edu.hk/english/js/homepage.js?202307180.0 ms38.8 KiB
cuhk.edu.hk/english/js/bootstrap/bootstrap.min.js0.0 ms34.9 KiB
cuhk.edu.hk/english/images/cuhk_logo_2x.png?202210270.0 ms29.9 KiB
cuhk.edu.hk/english/images/others/apru-logo-2025.png0.0 ms27.5 KiB
cuhk.edu.hk/english/images/social_media_icons/wechat_CUHKofficial.png0.0 ms24.9 KiB
cuhk.edu.hk/english/images/whats_on/home/x150/cuhk-ranking-2026_xen.png0.0 ms23.5 KiB
cuhk.edu.hk/english/js/common.js?2023080.0 ms18.5 KiB
cuhk.edu.hk/english/fonts/glyphicons-halflings-regular.woff20.0 ms17.8 KiB
cuhk.edu.hk/english/images/cuhk_logo_1x.png?2023010.0 ms15.7 KiB
/signals/config/1288639986224408?v=2.9.303&r=stable&domai...1200.0 s16.4 KiB
stats.g.doubleclick.net/dc.js7200.0 s17.3 KiB
cuhk.edu.hk/english/css/homepage.css?2023080.0 ms12.9 KiB
cuhk.edu.hk/english/js/jquery.dotdotdot.js0.0 ms12.1 KiB
cuhk.edu.hk/english/js/jquery.touchSwipe.min.js0.0 ms11.5 KiB
scripts.clarity.ms/0.8.59/clarity.js86400.0 s26.2 KiB
cuhk.edu.hk/english/js/modernizr.custom.35276.js0.0 ms9.4 KiB
snap.licdn.com/li.lms-analytics/insight.min.js86400.0 s18.7 KiB
cuhk.edu.hk/english/images/social-channels/icon-xiaohongshu.png0.0 ms4.9 KiB
cuhk.edu.hk/english/images/social-channels/icon-twitter.png0.0 ms4.8 KiB
connect.facebook.net/en_US/sdk.js1200.0 s5.0 KiB
cuhk.edu.hk/english/images/others/GovOrganisation_Logo_Funded_OL_Silver.png0.0 ms4.4 KiB
/english/images/others/GovOrganisation_Logo_Funded_OL_Sil...0.0 ms4.4 KiB
cuhk.edu.hk/english/fonts/google/fonts.css0.0 ms3.9 KiB
cuhk.edu.hk/english/images/student_bullet.png0.0 ms3.1 KiB
cuhk.edu.hk/english/images/social-channels/icon-sina-weibo.png0.0 ms2.4 KiB
cuhk.edu.hk/english/images/social-channels/icon-ig.png0.0 ms2.3 KiB
cuhk.edu.hk/english/images/social-channels/icon-wechat.png0.0 ms2.2 KiB
cuhk.edu.hk/english/js/jquery.jsonp.min.js0.0 ms2.1 KiB
cuhk.edu.hk/english/images/social-channels/icon-youtube.png0.0 ms1.3 KiB
cuhk.edu.hk/english/images/btn_search.png0.0 ms1.3 KiB
cuhk.edu.hk/english/images/social-channels/icon-in.png0.0 ms1.2 KiB
cuhk.edu.hk/english/js/google-analytics.js0.0 ms1008 B
cuhk.edu.hk/english/js/ie10-viewport-bug-workaround.js0.0 ms977 B
cuhk.edu.hk/english/images/social-channels/icon-fb.png0.0 ms958 B
cuhk.edu.hk/english/images/btn_rss.png0.0 ms922 B
cuhk.edu.hk/english/js/facebook-setup.js0.0 ms798 B
/collect?v=2&fmt=js&pid=7448180&time=1776813528066&url=ht...0.0 ms693 B
cuhk.edu.hk/english/images/spacer.gif0.0 ms311 B
/tr/?id=1288639986224408&ev=PageView&dl=https%3A%2F%2Fcuh...0.0 ms19 B
/tr/?id=597288989049581&ev=PageView&dl=https%3A%2F%2Fcuhk...0.0 ms16 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:0.018393] map[node:map[boundingRect:map[bottom:95 height:28 left:563 right:1350 top:67 width:788] lhId:page-1-NAV nodeLabel:STUDENTS | STAFF | ALUMNI | MEDIA | VISITORS path:1,HTML,1,BODY,0,DIV,0,HEADER,3,NAV selector:body > div#body-frame > header.full-col > nav#top_link_2 snippet:<nav id="top_link_2" class="col-xs-12 hidden-xs col-sm-7 col-md-7"> type:node] score:0.012414 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:53 height:2 left:16 right:18 top:51 width:2] lhId:page-2-IMG nodeLabel:To Content Pane path:1,HTML,1,BODY,0,DIV,0,HEADER,0,FIGURE,0,A,0,IMG selector:header.full-col > figure#logo > a#to-content-pane > img#header_content_pane snippet:<img src="/english/images/spacer.gif" alt="To Content Pane" border="0" id="header_content_pane"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:1485 height:122 left:20 right:333 top:1363 width:313] lhId:page-3-LI nodeLabel:APRU - The Voice of Knowledge & Innovation path:1,HTML,1,BODY,0,DIV,4,MAIN,1,SECTION,0,ASIDE,1,SECTION,1,UL,7,LI selector:aside#homepage_content_left > section#popular_links > ul > li.banner snippet:<li class="banner"> type:node] score:0.004788] map[node:map[boundingRect:map[bottom:26 height:17 left:1165 right:1259 top:9 width:95] lhId:page-4-A nodeLabel:Giving to CUHK path:1,HTML,1,BODY,0,DIV,0,HEADER,1,NAV,6,A selector:div#body-frame > header.full-col > nav#top_link_1 > a snippet:<a href="/english/giving.html"> type:node] score:0.001191 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:53 height:2 left:16 right:18 top:51 width:2] lhId:page-2-IMG nodeLabel:To Content Pane path:1,HTML,1,BODY,0,DIV,0,HEADER,0,FIGURE,0,A,0,IMG selector:header.full-col > figure#logo > a#to-content-pane > img#header_content_pane snippet:<img src="/english/images/spacer.gif" alt="To Content Pane" border="0" id="header_content_pane"> type:node]]] type:subitems]]]
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:0.376733] map[node:map[boundingRect:map[bottom:1491 height:759 left:0 right:1350 top:732 width:1350] lhId:page-10-SECTION nodeLabel:News Apr 21 Three CUHK scholars win BOCHK Science and Technology Innovation Pri… path:1,HTML,1,BODY,0,DIV,4,MAIN,1,SECTION selector:body > div#body-frame > main > section#homepage_content snippet:<section id="homepage_content" class="full-col"> type:node] score:0.322791 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:702 height:557 left:0 right:1350 top:146 width:1350] lhId:page-0-IMG nodeLabel:Conversations with four distinguished leaders path:1,HTML,1,BODY,0,DIV,4,MAIN,0,SECTION,0,DIV,1,DIV,1,DIV,0,A,0,DIV,0,IMG selector:div.item > a > div > img snippet:<img src="/english/images/home_slide/focus78-01a.jpg" alt="Conversations with four distinguished leaders" style="object-position:centre;" data-clarity-loaded="tkj7zm"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:1490 height:493 left:0 right:338 top:997 width:338] lhId:page-9-SECTION nodeLabel:Popular Links Strategic Plan 2021—2025 Senior Appointments CUHK External Engage… path:1,HTML,1,BODY,0,DIV,4,MAIN,1,SECTION,0,ASIDE,1,SECTION selector:main > section#homepage_content > aside#homepage_content_left > section#popular_links snippet:<section id="popular_links" class="col-xs-12"> type:node] score:0.031317] map[node:map[boundingRect:map[bottom:1491 height:759 left:0 right:1350 top:732 width:1350] lhId:page-10-SECTION nodeLabel:News Apr 21 Three CUHK scholars win BOCHK Science and Technology Innovation Pri… path:1,HTML,1,BODY,0,DIV,4,MAIN,1,SECTION selector:body > div#body-frame > main > section#homepage_content snippet:<section id="homepage_content" class="full-col"> type:node] score:0.010845] map[node:map[boundingRect:map[bottom:1178 height:313 left:844 right:1350 top:865 width:506] lhId:page-19-SECTION nodeLabel:CUHK in Focus Faculty of Law-led legal history association brings together over… path:1,HTML,1,BODY,0,DIV,4,MAIN,1,SECTION,1,SECTION,5,SECTION selector:main > section#homepage_content > section#homepage_content_right > section.col-xs-12 snippet:<section class="col-xs-12 col-sm-6 homepage_content_block more_of_cuhk odd"> type:node] score:0.008655] map[score:0.001843 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:842 height:67 left:864 right:964 top:775 width:100] lhId:page-26-IMG nodeLabel:div.item > article.upcoming-item > div.upcoming-item-photo > img path:1,HTML,1,BODY,0,DIV,4,MAIN,1,SECTION,1,SECTION,0,SECTION,1,DIV,0,DIV,0,DIV,0,DIV,1,ARTICLE,0,DIV,0,IMG selector:div.item > article.upcoming-item > div.upcoming-item-photo > img snippet:<img src="//www.cpr.cuhk.edu.hk/wp-content/uploads/submitevent/20260511_event.jpg" alt="" style="max-width: 100px; max-height: 67px;" data-clarity-loaded="wcv7lv"> type:node]]] type:subitems]]]

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
cuhk.edu.hk/english/fonts/glyphicons-halflings-regular.woff21.4 s
cuhk.edu.hk/english/fonts/Basel-Grotesk-Light.otf955 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
div.item > article.upcoming-item > div.upcoming-item-photo > img div.item > article.upcoming-item > div.upcoming-item-photo > img
/wp-content/uploads/submitevent/Conference-Thumbnail-aspe...1.7 MiB1.7 MiB
div.item > article.upcoming-item > div.upcoming-item-photo > img div.item > article.upcoming-item > div.upcoming-item-photo > img
www.cpr.cuhk.edu.hk/wp-content/uploads/submitevent/20260511_event.jpg583.5 KiB582.6 KiB
Ignite your memories with CUHK Visuals section.col-xs-12 > article > a > img
cuhk.edu.hk/english/images/whats_on/home/x150/cuvisuals1.jpg246.0 KiB226.2 KiB
Conversations with four distinguished leaders div.item > a > div > img
cuhk.edu.hk/english/images/home_slide/focus78-01a.jpg292.0 KiB169.7 KiB
Faculty of Law-led legal history association brings together over 20 law schools section.col-xs-12 > article > a > img
cuhk.edu.hk/english/images/whats_on/home/x150/focus78-01.jpg117.1 KiB97.3 KiB
10 Years plus Caring Organisation nav.full-col > div#footer_icons > a > img
cuhk.edu.hk/english/images/others/co_logo_10years-footer.png91.8 KiB90.6 KiB
Elderly-friendly Award at the Web Accessibility Recognition Scheme nav.full-col > div#footer_icons > a > img
cuhk.edu.hk/english/images/others/website-elderly-friendly_2025-footer.png71.7 KiB71.0 KiB
Triple Gold Award at the Web Accessibility Recognition Scheme nav.full-col > div#footer_icons > a > img
cuhk.edu.hk/english/images/others/website-triple-gold_2025-footer.png64.0 KiB63.3 KiB
The Chinese University of Hong Kong, Shenzhen ul > li.banner > a > img
cuhk.edu.hk/english/images/others/cuhk-sz-logo-2023.jpg45.2 KiB39.0 KiB
The Racial Diversity and Inclusion Charter for Employers nav.full-col > div#footer_icons > a > img
cuhk.edu.hk/english/images/others/charter-logo-footer.png38.7 KiB37.9 KiB
Do You Have a “Like-Minded Friend”? | Gen Z's Social Challenges in the Digital … section.col-xs-12 > article > a > img
cuhk.edu.hk/english/images/whats_on/home/x150/CUHK-Podcast_EP8_TCEN_CUTV.jpg56.2 KiB36.4 KiB
The Chinese University of Hong Kong header.full-col > figure#logo > a > img#header_cuhk_logo
cuhk.edu.hk/english/images/cuhk_logo_2x.png?2022102729.7 KiB26.7 KiB
APRU - The Voice of Knowledge & Innovation ul > li.banner > a > img
cuhk.edu.hk/english/images/others/apru-logo-2025.png27.3 KiB22.0 KiB
&nbsp; section#CUHK Rankings > article > a > img
cuhk.edu.hk/english/images/whats_on/home/x150/cuhk-ranking-2026_xen.png23.2 KiB15.4 KiB
Xiaohongshu nav.full-col > div#cuhk-social-channels > a > img
cuhk.edu.hk/english/images/social-channels/icon-xiaohongshu.png4.7 KiB4.6 KiB
Connect with us on CUHK Twitter nav.full-col > div#cuhk-social-channels > a > img
cuhk.edu.hk/english/images/social-channels/icon-twitter.png4.5 KiB4.4 KiB

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:336.9730009765625 label:Time to first byte subpart:timeToFirstByte] map[duration:4802.794999023437 label:Resource load delay subpart:resourceLoadDelay] map[duration:963.292 label:Resource load duration subpart:resourceLoadDuration] map[duration:40.715 label:Element render delay subpart:elementRenderDelay]]
lhId: page-0-IMG
nodeLabel: Conversations with four distinguished leaders
path: 1,HTML,1,BODY,0,DIV,4,MAIN,0,SECTION,0,DIV,1,DIV,1,DIV,0,A,0,DIV,0,IMG
selector: div.item > a > div > img
snippet: <img src="/english/images/home_slide/focus78-01a.jpg" alt="Conversations with four distinguished leaders" style="object-position:centre;" data-clarity-loaded="tkj7zm">

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: Conversations with four distinguished leaders
path: 1,HTML,1,BODY,0,DIV,4,MAIN,0,SECTION,0,DIV,1,DIV,1,DIV,0,A,0,DIV,0,IMG
selector: div.item > a > div > img
snippet: <img src="/english/images/home_slide/focus78-01a.jpg" alt="Conversations with four distinguished leaders" style="object-position:centre;" data-clarity-loaded="tkj7zm">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
cuhk.edu.hk/favicon.icohttp/1.1
cuhk.edu.hk/english/index.htmlhttp/1.1
cuhk.edu.hk/english/fonts/google/fonts.csshttp/1.1
cuhk.edu.hk/english/css/bootstrap.min.csshttp/1.1
cuhk.edu.hk/english/css/main.css?202603http/1.1
cuhk.edu.hk/english/js/google-analytics.jshttp/1.1
cuhk.edu.hk/english/js/facebook-setup.jshttp/1.1
cuhk.edu.hk/english/css/homepage.css?202308http/1.1
cuhk.edu.hk/english/images/fav-icons/manifest.jsonhttp/1.1
cuhk.edu.hk/english/images/spacer.gifhttp/1.1
cuhk.edu.hk/english/images/cuhk_logo_2x.png?20221027http/1.1
cuhk.edu.hk/english/images/btn_search.pnghttp/1.1
cuhk.edu.hk/english/images/cuhk_logo_1x.png?202301http/1.1
cuhk.edu.hk/english/images/btn_rss.pnghttp/1.1
cuhk.edu.hk/english/images/others/cuhk-sz-logo-2023.jpghttp/1.1
cuhk.edu.hk/english/images/others/apru-logo-2025.pnghttp/1.1
cuhk.edu.hk/english/images/others/charter-logo.pnghttp/1.1
cuhk.edu.hk/english/images/others/website-triple-gold_2025.pnghttp/1.1
cuhk.edu.hk/english/images/others/website-elderly-friendly_2025.pnghttp/1.1
cuhk.edu.hk/english/images/others/co_logo_10years.pnghttp/1.1
cuhk.edu.hk/english/images/others/GovOrganisation_Logo_Funded_OL_Silver.pnghttp/1.1
cuhk.edu.hk/english/images/social-channels/icon-fb.pnghttp/1.1
cuhk.edu.hk/english/images/social-channels/icon-youtube.pnghttp/1.1
cuhk.edu.hk/english/images/social-channels/icon-ig.pnghttp/1.1
cuhk.edu.hk/english/images/social-channels/icon-in.pnghttp/1.1
cuhk.edu.hk/english/images/social-channels/icon-twitter.pnghttp/1.1
cuhk.edu.hk/english/images/social-channels/icon-wechat.pnghttp/1.1
cuhk.edu.hk/english/images/social_media_icons/wechat_CUHKofficial.pnghttp/1.1
cuhk.edu.hk/english/images/social-channels/icon-sina-weibo.pnghttp/1.1
cuhk.edu.hk/english/images/social-channels/icon-xiaohongshu.pnghttp/1.1
cuhk.edu.hk/english/js/modernizr.custom.35276.jshttp/1.1
cuhk.edu.hk/english/js/jquery.min.jshttp/1.1
cuhk.edu.hk/english/js/jquery.touchSwipe.min.jshttp/1.1
cuhk.edu.hk/english/js/bootstrap/bootstrap.min.jshttp/1.1
cuhk.edu.hk/english/js/ie10-viewport-bug-workaround.jshttp/1.1
cuhk.edu.hk/english/js/jquery.jsonp.min.jshttp/1.1
cuhk.edu.hk/english/js/common.js?202308http/1.1
cuhk.edu.hk/english/js/jquery-ui-1.9.0.custom.min.jshttp/1.1
cuhk.edu.hk/english/js/jquery.dotdotdot.jshttp/1.1
cuhk.edu.hk/english/js/homepage.js?20230718http/1.1
cuhk.edu.hk/english/images/student_bullet.pnghttp/1.1
cuhk.edu.hk/english/fonts/Basel-Grotesk-Light.otfhttp/1.1
cuhk.edu.hk/english/fonts/glyphicons-halflings-regular.woff2http/1.1
cuhk.edu.hk/english/js/cuhk-survey.js?time=4212026111848PMhttp/1.1
cuhk.edu.hk/english/images/others/charter-logo-footer.pnghttp/1.1
cuhk.edu.hk/english/images/others/website-triple-gold_2025-footer.pnghttp/1.1
cuhk.edu.hk/english/images/others/website-elderly-friendly_2025-footer.pnghttp/1.1
cuhk.edu.hk/english/images/others/co_logo_10years-footer.pnghttp/1.1
/english/images/others/GovOrganisation_Logo_Funded_OL_Sil...http/1.1
cuhk.edu.hk/english/images/home_slide/focus78-01a_mobile.jpghttp/1.1
cuhk.edu.hk/english/images/home_slide/focus78-02_mobile.jpghttp/1.1
cuhk.edu.hk/english/images/home_slide/focus78-03_mobile.jpghttp/1.1
cuhk.edu.hk/english/images/home_slide/focus78-04_mobile.jpghttp/1.1
cuhk.edu.hk/english/images/home_slide/Touch27-01_mobile.pnghttp/1.1
cuhk.edu.hk/english/images/home_slide/Touch27-02_mobile.pnghttp/1.1
cuhk.edu.hk/english/images/home_slide/Touch27-03_mobile.pnghttp/1.1
cuhk.edu.hk/english/images/home_slide/Touch27-04_mobile.pnghttp/1.1
cuhk.edu.hk/english/images/home_slide/focus78-01a.jpghttp/1.1
cuhk.edu.hk/english/images/home_slide/focus78-02.jpghttp/1.1
cuhk.edu.hk/english/images/home_slide/focus78-03.jpghttp/1.1
cuhk.edu.hk/english/images/home_slide/focus78-04.jpghttp/1.1
cuhk.edu.hk/english/images/home_slide/Touch27-01.pnghttp/1.1
cuhk.edu.hk/english/images/home_slide/Touch27-02.pnghttp/1.1
cuhk.edu.hk/english/images/home_slide/Touch27-03.pnghttp/1.1
cuhk.edu.hk/english/images/home_slide/Touch27-04.pnghttp/1.1
cuhk.edu.hk/english/js/failover/media-news-events.js?_=1776813526372http/1.1
cuhk.edu.hk/english/images/whats_on/home/x150/cuhk-ranking-2026_xen.pnghttp/1.1
cuhk.edu.hk/english/images/whats_on/home/x150/focus78-01.jpghttp/1.1
cuhk.edu.hk/english/images/whats_on/home/x150/CUHK-Podcast_EP8_TCEN_CUTV.jpghttp/1.1
cuhk.edu.hk/english/images/whats_on/home/x150/cuvisuals1.jpghttp/1.1
cuhk.edu.hk/english/images/fav-icons/favicon-32x32.pnghttp/1.1

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.

URLTransfer Size
cuhk.edu.hk/english/css/bootstrap.min.css114.7 KiB
cuhk.edu.hk/english/js/facebook-setup.js798 B
cuhk.edu.hk/english/css/main.css?20260341.7 KiB
cuhk.edu.hk/english/js/google-analytics.js1008 B
cuhk.edu.hk/english/css/homepage.css?20230812.9 KiB
cuhk.edu.hk/english/fonts/google/fonts.css3.9 KiB

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.

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: 1.2 s
URLTime Spent
cuhk.edu.hk/1.2 s
cuhk.edu.hk/english/index.html0.0 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
News Apr 21 Three CUHK scholars win BOCHK Science and Technology Innovation Pri… body > div#body-frame > main > section#homepage_content
0.323
Popular Links Strategic Plan 2021—2025 Senior Appointments CUHK External Engage… main > section#homepage_content > aside#homepage_content_left > section#popular_links
0.031
STUDENTS | STAFF | ALUMNI | MEDIA | VISITORS body > div#body-frame > header.full-col > nav#top_link_2
0.012
News Apr 21 Three CUHK scholars win BOCHK Science and Technology Innovation Pri… body > div#body-frame > main > section#homepage_content
0.011
CUHK in Focus Faculty of Law-led legal history association brings together over… main > section#homepage_content > section#homepage_content_right > section.col-xs-12
0.009
APRU - The Voice of Knowledge & Innovation aside#homepage_content_left > section#popular_links > ul > li.banner
0.005
0.002
0.001
Giving to CUHK div#body-frame > header.full-col > nav#top_link_1 > a
0.001

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

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: 360 ms 140.6 KiB
URLTransfer SizeEst Savings
cuhk.edu.hk/english/css/bootstrap.min.css114.4 KiB106.5 KiB
cuhk.edu.hk/english/css/main.css?20260341.4 KiB34.1 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: 890 ms 484.5 KiB
URLTransfer SizeEst Savings
cuhk.edu.hk/english/js/jquery-ui-1.9.0.custom.min.js230.3 KiB205.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-KFSNLKZ134.4 KiB69.2 KiB
www.googletagmanager.com/gtag/js?id=G-3VWFFZCDJ6158.0 KiB62.2 KiB
connect.facebook.net/en_US/bundle/sdk.js/77.6 KiB53.7 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB34.7 KiB
cuhk.edu.hk/english/js/jquery.min.js93.7 KiB32.9 KiB
cuhk.edu.hk/english/js/bootstrap/bootstrap.min.js34.6 KiB26.8 KiB

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 16.9 KiB
URLTransfer SizeEst Savings
cuhk.edu.hk/english/css/main.css?20260341.7 KiB12.9 KiB
cuhk.edu.hk/english/css/homepage.css?20230812.9 KiB4.0 KiB

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 25.2 KiB
URLTransfer SizeEst Savings
cuhk.edu.hk/english/js/homepage.js?2023071838.5 KiB14.7 KiB
cuhk.edu.hk/english/js/common.js?20230818.3 KiB6.5 KiB
cuhk.edu.hk/english/js/jquery.dotdotdot.js11.8 KiB4.0 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
cuhk.edu.hk/english/images/home_slide/Touch27-01.png2.5 MiB
cuhk.edu.hk/english/images/home_slide/Touch27-03.png2.0 MiB
cuhk.edu.hk/english/images/home_slide/Touch27-04.png1.9 MiB
cuhk.edu.hk/english/images/home_slide/Touch27-02.png1.9 MiB
/wp-content/uploads/submitevent/Conference-Thumbnail-aspe...1.7 MiB
/wp-content/uploads/submitevent/20260424_CSSL-Webinar_EN-...1.1 MiB
/wp-content/uploads/submitevent/PGSym2026_v3.2_Preview-4-...753.4 KiB
www.cpr.cuhk.edu.hk/wp-content/uploads/submitevent/20260511_event.jpg583.8 KiB
cuhk.edu.hk/english/images/home_slide/focus78-04.jpg472.7 KiB
cuhk.edu.hk/english/images/home_slide/focus78-03.jpg410.1 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
div.item > article.upcoming-item > div.upcoming-item-photo > img div.item > article.upcoming-item > div.upcoming-item-photo > img
www.cpr.cuhk.edu.hk/wp-content/uploads/submitevent/20260511_event.jpg
Conversations with four distinguished leaders div.item > a > div > img
cuhk.edu.hk/english/images/home_slide/focus78-01a.jpg
div.item > article.upcoming-item > div.upcoming-item-photo > img div.item > article.upcoming-item > div.upcoming-item-photo > img
/wp-content/uploads/submitevent/Conference-Thumbnail-aspe...
&nbsp; section#CUHK Rankings > article > a > img
cuhk.edu.hk/english/images/whats_on/home/x150/cuhk-ranking-2026_xen.png
Faculty of Law-led legal history association brings together over 20 law schools section.col-xs-12 > article > a > img
cuhk.edu.hk/english/images/whats_on/home/x150/focus78-01.jpg
Do You Have a “Like-Minded Friend”? | Gen Z's Social Challenges in the Digital … section.col-xs-12 > article > a > img
cuhk.edu.hk/english/images/whats_on/home/x150/CUHK-Podcast_EP8_TCEN_CUTV.jpg
Ignite your memories with CUHK Visuals section.col-xs-12 > article > a > img
cuhk.edu.hk/english/images/whats_on/home/x150/cuvisuals1.jpg
The Racial Diversity and Inclusion Charter for Employers nav.full-col > div#footer_icons > a > img
cuhk.edu.hk/english/images/others/charter-logo-footer.png
Triple Gold Award at the Web Accessibility Recognition Scheme nav.full-col > div#footer_icons > a > img
cuhk.edu.hk/english/images/others/website-triple-gold_2025-footer.png
Elderly-friendly Award at the Web Accessibility Recognition Scheme nav.full-col > div#footer_icons > a > img
cuhk.edu.hk/english/images/others/website-elderly-friendly_2025-footer.png
Government-Funded Organisation nav.full-col > div#footer_icons > a > img
/english/images/others/GovOrganisation_Logo_Funded_OL_Sil...
10 Years plus Caring Organisation nav.full-col > div#footer_icons > a > img
cuhk.edu.hk/english/images/others/co_logo_10years-footer.png
The Chinese University of Hong Kong header.full-col > figure#logo > a > img#header_cuhk_logo
cuhk.edu.hk/english/images/cuhk_logo_2x.png?20221027
The Chinese University of Hong Kong, Shenzhen ul > li.banner > a > img
cuhk.edu.hk/english/images/others/cuhk-sz-logo-2023.jpg
APRU - The Voice of Knowledge & Innovation ul > li.banner > a > img
cuhk.edu.hk/english/images/others/apru-logo-2025.png
Find us on CUHK Official Facebook Page nav.full-col > div#cuhk-social-channels > a > img
cuhk.edu.hk/english/images/social-channels/icon-fb.png
Subscribe to CUHK YouTube Channel nav.full-col > div#cuhk-social-channels > a > img
cuhk.edu.hk/english/images/social-channels/icon-youtube.png
Follow us on CUHK Instagram nav.full-col > div#cuhk-social-channels > a > img
cuhk.edu.hk/english/images/social-channels/icon-ig.png
Connect with us on CUHK LinkedIn nav.full-col > div#cuhk-social-channels > a > img
cuhk.edu.hk/english/images/social-channels/icon-in.png
Connect with us on CUHK WeChat div#cuhk-social-channels > div.wechat_wrapper > a.wechat_icon > img
cuhk.edu.hk/english/images/social-channels/icon-wechat.png
CUHK Sina Weibo nav.full-col > div#cuhk-social-channels > a > img
cuhk.edu.hk/english/images/social-channels/icon-sina-weibo.png
Xiaohongshu nav.full-col > div#cuhk-social-channels > a > img
cuhk.edu.hk/english/images/social-channels/icon-xiaohongshu.png
Connect with us on CUHK Twitter nav.full-col > div#cuhk-social-channels > a > img
cuhk.edu.hk/english/images/social-channels/icon-twitter.png
To Content Pane header.full-col > figure#logo > a#to-content-pane > img#header_content_pane
cuhk.edu.hk/english/images/spacer.gif

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

●Optimize DOM size
●Forced reflow
●Network dependency tree
●Optimize viewport for mobile
●Max Potential First Input Delay 40 ms
●User Timing marks and measures 7 user timings
●JavaScript execution time 0.3 s
●Minimizes main-thread work 0.8 s
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 320 ms
●Server Backend Latencies 220 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 330 ms
○INP breakdown
○Avoid long main-thread tasks
○Avoid non-composited animations
82

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
Conversations with four distinguished leaders Outstanding students elevate exce… main > section#feature-container > div#feature > div.carousel-inner
CUHK SWK International Conference on “Enhancing Social Inclusion and Sustainabi… section#upcoming-events > div#upcoming-content > div#upcoming-page-wrapper > div.carousel-inner

When an input field doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn more about input field labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Conversations with four distinguished leaders Outstanding students elevate exce… main > section#feature-container > div#feature > div.carousel-inner
CUHK SWK International Conference on “Enhancing Social Inclusion and Sustainabi… section#upcoming-events > div#upcoming-content > div#upcoming-page-wrapper > div.carousel-inner

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.

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
To Content Pane div#body-frame > header.full-col > figure#logo > a#to-content-pane
Conversations with four distinguished leaders div.carousel-inner > ol.carousel-indicators > li.active > a
Outstanding students elevate excellence to impact div.carousel-inner > ol.carousel-indicators > li > a
Days of our lives div.carousel-inner > ol.carousel-indicators > li > a
Meet ‘Boon’, a 24-hour companion div.carousel-inner > ol.carousel-indicators > li > a
Earth’s first breath div.carousel-inner > ol.carousel-indicators > li > a
Unlocking the heart’s regeneration secret div.carousel-inner > ol.carousel-indicators > li > a
Seeing the unseen: charting a new era for brain surgery div.carousel-inner > ol.carousel-indicators > li > a
‘Super’ cancer killer emerges from AI discovery div.carousel-inner > ol.carousel-indicators > li > a

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
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Image elements have `[alt]` attributes
●`<input type="image">` elements have `[alt]` text
●Form elements have associated labels
●ARIA attributes are used as specified for the element's role
●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 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
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Image elements do not have `[alt]` attributes that are redundant text.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○`[aria-hidden="true"]` elements do not contain focusable descendents
○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
○Buttons have an accessible name
○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.
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○No element has a `[tabindex]` value greater than 0
○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
○Identical links have the same purpose.
○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.
73

Best Practices

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLDisplayed sizeActual sizeExpected size
To Content Pane header.full-col > figure#logo > a#to-content-pane > img#header_content_pane
cuhk.edu.hk/english/images/spacer.gif2 x 21 x 12 x 2

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
AttributionReporting
snap.licdn.com/li.lms-analytics/insight.min.js

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
cuhk.edu.hk/english/images/others/website-triple-gold_2025.png
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/images/others/charter-logo.png
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/images/others/website-elderly-friendly_2025.png
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/images/others/co_logo_10years.png
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/js/cuhk-survey.js?time=4212026111848PM
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/images/home_slide/Touch27-02_mobile.png
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/images/home_slide/focus78-02_mobile.jpg
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/images/home_slide/Touch27-01_mobile.png
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/images/home_slide/focus78-01a_mobile.jpg
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/images/home_slide/focus78-03_mobile.jpg
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/images/home_slide/focus78-04_mobile.jpg
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/images/home_slide/Touch27-03_mobile.png
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/images/home_slide/Touch27-04_mobile.png
Failed to load resource: the server responded with a status of 404 (Not Found)
cuhk.edu.hk/english/js/homepage.js?20230718 line 946, col 13
TypeError: Cannot set properties of undefined (setting 'onclick') at HTMLDocument.<anonymous> (https://cuhk.edu.hk/english/js/homepage.js?20230718:947:14) at j (https://cuhk.edu.hk/english/js/jquery.min.js:2:27295) at Object.fireWith [as resolveWith] (https://cuhk.edu.hk/english/js/jquery.min.js:2:28108) at m.ready (https://cuhk.edu.hk/english/js/jquery.min.js:2:29942) at HTMLDocument.J (https://cuhk.edu.hk/english/js/jquery.min.js:2:30308)
●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
●Page has the HTML doctype
●Properly defines charset
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
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`

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