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https://cityu.edu.hk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
2
REVIEW
2
PASS
11
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
0
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
45
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
36
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

0 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

0 ms

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.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

0 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

0 ms

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
11 PASS 2 REVIEW 2 FIX
D
Third-Party Impact
Action
96% third-party, 0 ms blocking
FIX
96% third-party, 0 ms blocking
Warning::
Third-party code accounts for 96% of page weight (638.5 KiB of 666.5 KiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-cache, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, no-store

DirectiveValueMeaning
no-cache—Cache but always revalidate first
no-store—Never cache this response
B
JS Execution Cost
653ms total JS execution
REVIEW
653ms total JS execution
Warning::
https://js.hcaptcha.com/1/api.js: 390ms CPU time
Info::
Unattributable: 181ms CPU time
Info::
https://cityu.edu.hk/_Incapsula_Resource?SWJIYLWA=...: 83ms CPU time
Warning::
Third-party scripts: 570ms (87% of total)

Main Thread Breakdown

Script Evaluation 45% Other 29% Style & Layout 15% Script Parsing & Compilation 8% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://js.hcaptcha.com/1/api.js390ms233ms37ms3rd
Unattributable181ms7ms0ms3rd
https://cityu.edu.hk/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f383ms69ms12ms1st
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
666 KB transferred, 17 requests
PASS
666 KB transferred, 17 requests
Info::
Page weighs 2.4 MB (666 KB transferred)
Info::
17 HTTP requests
Info::
Estimated 0.14 g CO2 per page load
666 KB / 2.4 MB budget
666 KB transferred
17 requests
0.14 g CO2 per page load
JavaScript 482.9 KiB 72%
HTML 173.7 KiB 26%
Other 4.7 KiB 1%
Other 4.0 KiB 1%
Other 1.1 KiB 0%
Images 35 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Image Optimization
4 images, 0 KB saveable
PASS
4 images, 0 KB saveable
Info::
All images are well-optimized
4 images 0 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
3 scripts, 0 KB unused
PASS
3 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cityu.edu.hk/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f319 KB—✓1st
https://js.hcaptcha.com/1/api.js86 KB—✓3rd
https://newassets.hcaptcha.com/c/d48c491644d555edb0e283c66c2698dbaec44c9f1c02167e386f51f75a8d27bb/hsw.js378 KB—✓3rd
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
17 resources · 666 KB · 0 KB savings available
PASS
17 resources · 666 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 666 KB
Warning::
12 third-party resources (96% of weight)
Info::
1 resources over 200KB
17 resources · 666.5 KiB · 12 third-party Within 1MB page-weight target
JavaScript 72% · 482.9 KiB
Document 26% · 173.9 KiB
Image 1% · 8.5 KiB
Other 0% · 1.1 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
17 requests over 4172ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 shttps://cityu.edu.hk// https://cityu.edu.hk/ — 200 — 1.3 KiB — 332 ms — h2https://cityu.edu.hk/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3/_Incapsula_Resource?SWJIYLWA=719d3... https://cityu.edu.hk/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3 — 200 — 18.9 KiB — 535 ms — h2https://cityu.edu.hk/_Incapsula_Resource?SWKMTFSR=1&e=0.6780308791005292/_Incapsula_Resource?SWKMTFSR=1&e=0... https://cityu.edu.hk/_Incapsula_Resource?SWKMTFSR=1&e=0.6780308791005292 — 200 — 35 B — 141 ms — h2https://cityu.edu.hk/_Incapsula_Resource?SWUDNSAI=31&xinfo=14-26075065-0%200NNN%20RT%281776815359829%20111%29%20q%280%20-1%20-1%20-1%29%20r%280%20-1%29%20B12%284%2c315%2c0%29%20U5&incident_id=1430000640055976935-121608898113572878&edet=12&cinfo=04000000&rpinfo=0&cts=uQvRwM0wtF28g%2fSQ2thb5tBFqAf%2bHgxF%2bMjvR%2fYPmH04QdyfKUFZfMRox%2fAQvEmL&cip=213.156.150.18&mth=GET/_Incapsula_Resource?SWUDNSAI=31&xi... https://cityu.edu.hk/_Incapsula_Resource?SWUDNSAI=31&xinfo=14-26075065-0%200NNN%20RT%281776815359829%20111%29%20q%280%20-1%20-1%20-1%29%20r%280%20-1%29%20B12%284%2c315%2c0%29%20U5&incident_id=1430000640055976935-121608898113572878&edet=12&cinfo=04000000&rpinfo=0&cts=uQvRwM0wtF28g%2fSQ2thb5tBFqAf%2bHgxF%2bMjvR%2fYPmH04QdyfKUFZfMRox%2fAQvEmL&cip=213.156.150.18&mth=GET — 200 — 7.6 KiB — 146 ms — h2https://js.hcaptcha.com/1/api.jsjs.hcaptcha.com/1/api.js https://js.hcaptcha.com/1/api.js — 200 — 85.8 KiB — 50 ms — h3https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.htmlnewassets.hcaptcha.com/captcha/v1/7... https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.html — 200 — 164.8 KiB — 53 ms — h3https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.htmlnewassets.hcaptcha.com/captcha/v1/7... https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.html — 200 — 0 B — 46 ms — h3data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGUAAAAeCAYAAAA1mdDNAAAAAXNSR0IArs4c6QAACh5JREFUaAXtW…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGUAAAAeCAYAAAA1mdDNAAAAAXNSR0IArs4c6QAACh5JREFUaAXtW… — 200 — 0 B — 0 ms — datahttps://b1748f5948a4.w.hcaptcha.com/logo.pngb1748f5948a4.w.hcaptcha.com/logo.pn... https://b1748f5948a4.w.hcaptcha.com/logo.png — 200 — 2.0 KiB — 33 ms — http/1.1data:image/gif;base64,R0lGODlhyADIAPQZAPb29vX19e3t7fT09Orq6vLy8u7u7vv7++np6ezs7Ovr6+jo6O/v7/r6+vj4+…data:image/gif;base64,R0lGODlhyADIA... data:image/gif;base64,R0lGODlhyADIAPQZAPb29vX19e3t7fT09Orq6vLy8u7u7vv7++np6ezs7Ovr6+jo6O/v7/r6+vj4+… — 200 — 0 B — 1 ms — datahttps://api.hcaptcha.com/checksiteconfig?v=7d7b8b396198c8eb285d18bbc376e49a41bb440a&host=cityu.edu.hk&sitekey=dd6e16a7-972e-47d2-93d0-96642fb6d8de&sc=1&swa=1&spst=1api.hcaptcha.com/checksiteconfig?v=... https://api.hcaptcha.com/checksiteconfig?v=7d7b8b396198c8eb285d18bbc376e49a41bb440a&host=cityu.edu.hk&sitekey=dd6e16a7-972e-47d2-93d0-96642fb6d8de&sc=1&swa=1&spst=1 — 200 — 1.1 KiB — 44 ms — h3data:image/gif;base64,R0lGODlhyADIAPQZAPb29vX19e3t7fT09Orq6vLy8u7u7vv7++np6ezs7Ovr6+jo6O/v7/r6+vj4+…data:image/gif;base64,R0lGODlhyADIA... data:image/gif;base64,R0lGODlhyADIAPQZAPb29vX19e3t7fT09Orq6vLy8u7u7vv7++np6ezs7Ovr6+jo6O/v7/r6+vj4+… — 200 — 0 B — 1 ms — datahttps://85bca9ae95cc.w.hcaptcha.com/logo.png85bca9ae95cc.w.hcaptcha.com/logo.pn... https://85bca9ae95cc.w.hcaptcha.com/logo.png — 200 — 2.0 KiB — 29 ms — http/1.1data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaXHeAAAABmJLR0QA/wD/AP+gvaeTAAAC00lEQ…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaXHeAAAABmJLR0QA/wD/AP+gvaeTAAAC00lEQ… — 200 — 0 B — 0 ms — datahttps://newassets.hcaptcha.com/c/d48c491644d555edb0e283c66c2698dbaec44c9f1c02167e386f51f75a8d27bb/hsw.jsnewassets.hcaptcha.com/c/d48c491644... https://newassets.hcaptcha.com/c/d48c491644d555edb0e283c66c2698dbaec44c9f1c02167e386f51f75a8d27bb/hsw.js — 200 — 378.3 KiB — 32 ms — h3https://cityu.edu.hk/favicon.ico/favicon.ico https://cityu.edu.hk/favicon.ico — 301 — 243 B — 927 ms — h2https://www.cityu.edu.hk/favicon.icowww.cityu.edu.hk/favicon.ico https://www.cityu.edu.hk/favicon.ico — 200 — 4.5 KiB — 1.6 s — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
87% of JavaScript execution is third-party
First-party Third-party 570ms · 86KB · HK$42/mo
js.hcaptcha.com
Other
Costly
Execution 390ms
Transfer 86 KB
Monthly Cost HK$29/mo
Unattributable
Other
Optional
Execution 181ms
Transfer 0 KB
Monthly Cost HK$13/mo

These scripts may cost more than they're worth

  • js.hcaptcha.com adds 390ms and costs ~HK$29/month

87% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

js.hcaptcha.com takes 390ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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