Lighthouse Mobile
· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.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.
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
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.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
Conversations with four distinguished leaders div.item > a > div > img | cuhk.edu.hk/english/images/home_slide/focus78-01a.jpg | 292.0 KiB | 257.1 KiB |
Ignite your memories with CUHK Visuals section.col-xs-12 > article > a > img | cuhk.edu.hk/english/images/whats_on/home/x150/cuvisuals1.jpg | 246.0 KiB | 210.4 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.jpg | 117.1 KiB | 81.5 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.jpg | 56.2 KiB | 20.7 KiB |
The Chinese University of Hong Kong nav.navbar > div.navbar-header > a.navbar-brand > img | cuhk.edu.hk/english/images/cuhk_logo_1x.png?202301 | 15.4 KiB | 13.2 KiB |
section#CUHK Rankings > article > a > img | cuhk.edu.hk/english/images/whats_on/home/x150/cuhk-ranking-2026_xen.png | 23.2 KiB | 8.0 KiB |
Xiaohongshu nav.full-col > div#cuhk-social-channels > a > img | cuhk.edu.hk/english/images/social-channels/icon-xiaohongshu.png | 4.7 KiB | 4.5 KiB |
Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.
Performance issues directly impact user engagement and conversion rates.
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Performance issues directly impact user engagement and conversion rates.
HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Time Spent |
|---|---|
| cuhk.edu.hk/ | 1.7 s |
| cuhk.edu.hk/english/index.html | 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
Performance issues directly impact user engagement and conversion rates.
| Element | Layout shift score |
|---|---|
Contact Us | Site Map | Send Your Comment | Accessibility | Pri… body > footer.col-xs-12 | 0.278 |
Contact Us | Site Map | Send Your Comment | Accessibility | Pri… body > footer.col-xs-12 | 0.161 |
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 | 0.082 |
Contact Us | Site Map | Send Your Comment | Accessibility | Pri… body > footer.col-xs-12 | 0.043 |
Events
CUHK SWK International Conference on “Enhancing Social Inclusion and Sus… body > div#body-frame > main > section#homepage_content | 0.011 |
Contact Us | Site Map | Send Your Comment | Accessibility | Privacy Pol… body > footer.col-xs-12 > nav.full-col > div#footer_links | 0.001 |
Previous Upcoming Events section#upcoming-events > div#upcoming-content > div#upcoming-page-wrapper > div#upcoming-left-button | 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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
Diagnostics
Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| cuhk.edu.hk/english/js/homepage.js?20230718 | 38.5 KiB | 14.7 KiB |
| cuhk.edu.hk/english/js/common.js?202308 | 18.3 KiB | 6.5 KiB |
| cuhk.edu.hk/english/js/jquery.dotdotdot.js | 11.8 KiB | 4.0 KiB |
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| cuhk.edu.hk/english/css/bootstrap.min.css | 114.4 KiB | 109.0 KiB |
| cuhk.edu.hk/english/css/main.css?202603 | 41.4 KiB | 37.5 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| cuhk.edu.hk/english/js/jquery-ui-1.9.0.custom.min.js | 230.3 KiB | 205.0 KiB |
| www.googletagmanager.com/gtm.js?id=GTM-KFSNLKZ | 134.4 KiB | 69.0 KiB |
| www.googletagmanager.com/gtag/js?id=G-3VWFFZCDJ6 | 157.8 KiB | 62.3 KiB |
| connect.facebook.net/en_US/bundle/sdk.js/ | 77.6 KiB | 53.7 KiB |
| connect.facebook.net/en_US/fbevents.js | 96.5 KiB | 34.3 KiB |
| cuhk.edu.hk/english/js/jquery.min.js | 93.7 KiB | 33.5 KiB |
| cuhk.edu.hk/english/js/bootstrap/bootstrap.min.js | 34.6 KiB | 26.8 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Total CPU Time | Script Evaluation | Script Parse |
|---|---|---|---|
| Unattributable | 895 ms | 19 ms | 0.0 ms |
| www.googletagmanager.com/gtag/js?id=G-3VWFFZCDJ6 | 314 ms | 269 ms | 36 ms |
| cuhk.edu.hk/english/js/jquery.min.js | 291 ms | 215 ms | 7.4 ms |
| scripts.clarity.ms/0.8.59/clarity.js | 270 ms | 225 ms | 7.1 ms |
| cuhk.edu.hk/english/js/jquery.jsonp.min.js | 242 ms | 189 ms | 0.3 ms |
| cuhk.edu.hk/english/index.html | 189 ms | 7.5 ms | 3.1 ms |
| www.googletagmanager.com/gtm.js?id=GTM-KFSNLKZ | 167 ms | 137 ms | 28 ms |
| connect.facebook.net/en_US/fbevents.js | 113 ms | 84 ms | 29 ms |
| /signals/config/597288989049581?v=2.9.303&r=stable&domain... | 106 ms | 91 ms | 15 ms |
| connect.facebook.net/en_US/bundle/sdk.js/ | 72 ms | 51 ms | 20 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
Performance issues directly impact user engagement and conversion rates.
| Category | Time Spent |
|---|---|
| Script Evaluation | 1.5 s |
| Other | 1.0 s |
| Script Parsing & Compilation | 204 ms |
| Style & Layout | 130 ms |
| Parse HTML & CSS | 56 ms |
| Rendering | 53 ms |
| Garbage Collection | 15 ms |
Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| cuhk.edu.hk/english/css/main.css?202603 | 41.7 KiB | 12.9 KiB |
| cuhk.edu.hk/english/css/homepage.css?202308 | 12.9 KiB | 4.0 KiB |
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
Performance issues directly impact user engagement and conversion rates.
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
Performance issues directly impact user engagement and conversion rates.
| URL | |
|---|---|
Conversations with four distinguished leaders div.item > a > div > img | cuhk.edu.hk/english/images/home_slide/focus78-01a.jpg |
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 Chinese University of Hong Kong nav.navbar > div.navbar-header > a.navbar-brand > img | cuhk.edu.hk/english/images/cuhk_logo_1x.png?202301 |
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 |
More information about the performance of your application. These numbers don't directly affect the Performance score.
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Conversations with four distinguished leaders
Honorary graduates of 96th Congre… 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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Conversations with four distinguished leaders
Honorary graduates of 96th Congre… 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.
Informational: a Permissions-Policy directive showing feature -> allowed origins.
Source: MDN Permissions-Policy
| Failing Elements |
|---|
head > meta head > meta |
These items highlight common accessibility best practices.
Best Practices
General
Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.
Performance issues directly impact user engagement and conversion rates.
| Deprecation / Warning | Source |
|---|---|
| AttributionReporting |
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
Performance issues directly impact user engagement and conversion rates.
| Source | Description |
|---|---|
Failed to load resource: the server responded with a status of 404 (Not Found) | |
Failed to load resource: the server responded with a status of 404 (Not Found) | |
Failed to load resource: the server responded with a status of 404 (Not Found) | |
Failed to load resource: the server responded with a status of 404 (Not Found) | |
Failed to load resource: the server responded with a status of 404 (Not Found) | |
Failed to load resource: the server responded with a status of 404 (Not Found) | |
Failed to load resource: the server responded with a status of 404 (Not Found) | |
Failed to load resource: the server responded with a status of 404 (Not Found) | |
Failed to load resource: the server responded with a status of 404 (Not Found) | |
Failed to load resource: the server responded with a status of 404 (Not Found) | |
Failed to load resource: the server responded with a status of 404 (Not Found) | |
Failed to load resource: the server responded with a status of 404 (Not Found) | |
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) |
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.