Spain · Madrid Completed: Apr 21, 2026 23:20 UTCMobile 375 × 812
Desktop 1440 × 900
Score: 71 / 100
Based on 8 categories, 0 sections
Decent speed, but optimizing further could improve engagement.
Several missing protections leave your users and data exposed.
Several issues make your site difficult for assistive technology users.
Well-optimized for search — your content is discoverable.
Good server performance with room for optimization.
Mostly compliant — a few items need attention.
Missing metadata means poor previews on social media and search.
Heavier than average — reducing page weight saves energy and bandwidth.
The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.
Weights reflect general web best practices. Individual needs may differ.
Content-Security-Policy header is missing
Security gaps expose your site and users to attacks, eroding trust.
HSTS header is missing
Security gaps expose your site and users to attacks, eroding trust.
No Content-Security-Policy header found
Security gaps expose your site and users to attacks, eroding trust.
Page weighs 17.6 MB (16.3 MB transferred)
Performance issues directly impact user engagement and conversion rates.
1 control(s) without accessible label
Accessibility issues exclude users with disabilities — up to 15% of your potential audience.
High impact, low effort — start here.
High impact, requires investment.
Small gains, minimal effort.
Nothing in this quadrant — good news.
Low impact, high effort — do last.
Nothing in this quadrant — good news.
[](https://beavercheck.com/results/a5baf3e2-8481-49e6-bb77-2cf30c973840)<a href="https://beavercheck.com/results/a5baf3e2-8481-49e6-bb77-2cf30c973840"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fcuhk.edu.hk" alt="BeaverCheck Score"></a>https://beavercheck.com/badge?url=https%3A%2F%2Fcuhk.edu.hkThis badge auto-updates with your latest scan result.
Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Your LCP of 18.5s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. Addressing the critical issues below would have the most immediate impact on your user trust.
11 barrier(s) likely increasing bounce by ~38%.
Page takes 18.5s to load
+12% bounceUsers abandon at ~3s — you're 16.0s over the 2.5s threshold
Fix: Optimize render-blocking resources, preload the hero image, and compress images
High main-thread blocking time
+2% bouncePage is non-interactive for 335ms after first paint
Fix: Defer third-party scripts and split large bundles
Mixed content on HTTPS page
+8% bounceBrowsers block insecure subresources — broken images, missing scripts, warning badge
Fix: Change http:// URLs inside the page to https:// (or protocol-relative)
No HSTS header
+1% bounceReturning visitors are briefly exposed to downgrade attacks on first request
Fix: Set Strict-Transport-Security: max-age=31536000; includeSubDomains
No Content-Security-Policy header
+1% bounceHigher XSS blast radius — one compromised script can exfiltrate the checkout form
Fix: Ship a reporting-only CSP first, then enforce once violations are clean
Severe layout shift during page load
+6% bounceUsers mis-click when content jumps — converting intent into frustration
Fix: Reserve space for images, ads, and embeds with explicit width/height
1 form field(s) without a label
+2% bounceScreen readers skip unlabeled fields; autofill can't identify them; checkout abandonment spikes
Fix: Associate every input with a visible <label for="…">; add autocomplete attributes
Viewport disables user zoom
+2% bounceVisitors with low vision can't read the page — and some jurisdictions treat this as a legal risk
Fix: Remove user-scalable=no; drop maximum-scale if it's below 2
No structured data
+2% bounceNo rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices
Fix: Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)
No skip-to-content link
+1% bounceKeyboard and screen-reader users must tab through the entire header on every page
Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element
10 broken link(s) on the page
+5% bounceClicks land on 404s — trust drops and the session often ends
Fix: Fix or remove the broken destinations surfaced on the Content tab
Preliminary CRO audit — each barrier links to the tab with detailed analysis.
HKD 2,750 investment → HKD 32/month returns
HKD 2,750
5h · 5 findings
HKD 32 /mo
~HKD 383 / year
No applicable regulations in this jurisdiction
HKD 825 — in quick wins — start here for the fastest payback
Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.
5.0 developer hours at HK$550/hr
Based on Hong Kong rates (HK$550/hr)
Start here for the best return on investment
HKD 32 / month at risk
~HKD 383 / year if left unfixed
HKD 32 /mo
51127.4 MB/mo × 0.625 HKD/GB
Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.
Unique monthly visitors from your analytics
Purchases, signups, or key actions
Optional — for revenue estimation
more engaged visitors from reduced bounce
Fix 5 critical issues to capture this value
Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.
Your site's LCP: → estimated after fixes.
These are estimates based on industry research — actual results vary
Your data stays in your browser — nothing is sent to our servers
Thanks for your feedback!
We'll use a cached audit if available, or offer to scan.
Industry-standard audits powered by Google Lighthouse.
Key metrics that affect user experience.
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.64 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
18.55 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
335 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.575
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
17.41 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
21.98 s
Audit breakdown by category with detailed findings.
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
Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.
Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.
Source: Google web.dev / Lighthouse
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.
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.
Multi-megabyte JavaScript bundles delay every interactive feature on the page.
This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.
Source: Google web.dev / Lighthouse
| 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.
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.
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.
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
head > meta head > meta |
These items highlight common accessibility best practices.
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) |
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.
Industry-standard audits powered by Google Lighthouse. — Desktop
Key metrics that affect user experience. — Desktop
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.88 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.54 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.377
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.99 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
7.58 s
Audit breakdown by category with detailed findings.
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
Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.
Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.
Source: Google web.dev / Lighthouse
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 | |
|---|---|---|---|
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 MiB | 1.7 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.jpg | 583.5 KiB | 582.6 KiB |
Ignite your memories with CUHK Visuals section.col-xs-12 > article > a > img | cuhk.edu.hk/english/images/whats_on/home/x150/cuvisuals1.jpg | 246.0 KiB | 226.2 KiB |
Conversations with four distinguished leaders div.item > a > div > img | cuhk.edu.hk/english/images/home_slide/focus78-01a.jpg | 292.0 KiB | 169.7 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.jpg | 117.1 KiB | 97.3 KiB |
10 Years plus Caring Organisation nav.full-col > div#footer_icons > a > img | cuhk.edu.hk/english/images/others/co_logo_10years-footer.png | 91.8 KiB | 90.6 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.png | 71.7 KiB | 71.0 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.png | 64.0 KiB | 63.3 KiB |
The Chinese University of Hong Kong, Shenzhen ul > li.banner > a > img | cuhk.edu.hk/english/images/others/cuhk-sz-logo-2023.jpg | 45.2 KiB | 39.0 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.png | 38.7 KiB | 37.9 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.jpg | 56.2 KiB | 36.4 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?20221027 | 29.7 KiB | 26.7 KiB |
APRU - The Voice of Knowledge & Innovation ul > li.banner > a > img | cuhk.edu.hk/english/images/others/apru-logo-2025.png | 27.3 KiB | 22.0 KiB |
section#CUHK Rankings > article > a > img | cuhk.edu.hk/english/images/whats_on/home/x150/cuhk-ranking-2026_xen.png | 23.2 KiB | 15.4 KiB |
Xiaohongshu nav.full-col > div#cuhk-social-channels > a > img | cuhk.edu.hk/english/images/social-channels/icon-xiaohongshu.png | 4.7 KiB | 4.6 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.png | 4.5 KiB | 4.4 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/ | 1.2 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 |
|---|---|
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.
Performance issues directly impact user engagement and conversion rates.
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 | 106.5 KiB |
| cuhk.edu.hk/english/css/main.css?202603 | 41.4 KiB | 34.1 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.
Multi-megabyte JavaScript bundles delay every interactive feature on the page.
This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.
Source: Google web.dev / Lighthouse
| 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 | 69.2 KiB |
| www.googletagmanager.com/gtag/js?id=G-3VWFFZCDJ6 | 158.0 KiB | 62.2 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 | 34.7 KiB |
| cuhk.edu.hk/english/js/jquery.min.js | 93.7 KiB | 32.9 KiB |
| cuhk.edu.hk/english/js/bootstrap/bootstrap.min.js | 34.6 KiB | 26.8 KiB |
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 |
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 |
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 | |
|---|---|
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... |
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.
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.
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
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.
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.
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.
Performance issues directly impact user engagement and conversion rates.
| 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.
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.
Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.
Performance issues directly impact user engagement and conversion rates.
| URL | Displayed size | Actual size | Expected size | |
|---|---|---|---|---|
To Content Pane header.full-col > figure#logo > a#to-content-pane > img#header_content_pane | cuhk.edu.hk/english/images/spacer.gif | 2 x 2 | 1 x 1 | 2 x 2 |
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) |
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.
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