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Performance

· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
2
REVIEW
3
PASS
18
INFO
5

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

Mobile Desktop
60
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

3.88 s

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

6.76 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

327 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.055

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

3.88 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.

6.76 s

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
28
18 PASS 3 REVIEW 2 FIX
D
Third-Party Impact
Action
71% third-party, 0 ms blocking
FIX
71% third-party, 0 ms blocking
Warning::
Third-party code accounts for 71% of page weight (389.9 KiB of 551.7 KiB)
Info::
Third-party blocking time is low (0 ms)
29%
71%
First-party Third-party
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
JS Execution Cost
Action
1647ms total JS execution
REVIEW
1647ms total JS execution
Warning::
https://gaokaoexam.org/: 434ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-VB2Z...: 347ms CPU time
Warning::
Unattributable: 339ms CPU time
Warning::
https://gaokaoexam.org/assets/entry.client-DPaSBi4...: 301ms CPU time
Info::
https://scripts.clarity.ms/0.8.70/clarity.js: 225ms CPU time
Info::
Third-party scripts: 572ms (35% of total)

Main Thread Breakdown

Script Evaluation 48% Other 22% Style & Layout 20% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://gaokaoexam.org/434ms37ms9ms1st
https://www.googletagmanager.com/gtag/js?id=G-VB2ZY7128N347ms278ms67ms3rd
Unattributable339ms21ms0ms1st
https://gaokaoexam.org/assets/entry.client-DPaSBi4y.js301ms259ms1ms1st
https://scripts.clarity.ms/0.8.70/clarity.js225ms200ms10ms3rd
B
JS Bundles
12 scripts, 112 KB unused
REVIEW
12 scripts, 112 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-VB2Z...: 68 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://gaokaoexam.org/assets/jsx-runtime-BilL7PSO...: 24 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://gaokaoexam.org/assets/entry.client-DPaSBi4...: 21 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 112 KB
112 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-VB2ZY7128N157 KB68 KB (43%)✓3rd
https://gaokaoexam.org/assets/jsx-runtime-BilL7PSO.js39 KB24 KB (61%)✓1st
https://gaokaoexam.org/assets/entry.client-DPaSBi4y.js59 KB21 KB (36%)✓1st
https://gaokaoexam.org/assets/root-DXWU8rpP.js3 KB—✓1st
https://gaokaoexam.org/assets/subject-navigation-context-bwKp6e5N.js5 KB—✓1st
https://gaokaoexam.org/assets/home-7Z4s1Eoj.js5 KB—✓1st
https://gaokaoexam.org/assets/site-chrome-DVwGL8KW.js2 KB—✓1st
https://gaokaoexam.org/assets/subject-card-Dyi71FvQ.js1 KB—✓1st
https://gaokaoexam.org/assets/paper-route-DZ5FolEU.js1 KB—✓1st
https://static.cloudflareinsights.com/beacon.min.js/v31edd6df95cf4e85bb4c19e7a9bdbcba178836298749510 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
A+
Page Weight Budget
552 KB transferred, 35 requests
PASS
552 KB transferred, 35 requests
Info::
Page weighs 1.2 MB (552 KB transferred)
Info::
35 HTTP requests
Info::
Estimated 0.11 g CO2 per page load
552 KB / 2.4 MB budget
552 KB transferred
35 requests
0.11 g CO2 per page load
JavaScript 308.4 KiB 56%
Fonts 190.3 KiB 34%
CSS 28.0 KiB 5%
HTML 14.0 KiB 3%
Other 4.3 KiB 1%
Images 2.4 KiB 0%
Other 1.7 KiB 0%
Other 1.2 KiB 0%
Other 814 B 0%
Other 745 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
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 2 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
Font Loading
5 fonts (190 KB)
PASS
5 fonts (190 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

190 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.9 s LCP 6.8 shttps://fonts.gstatic.com/s/ibmplexmono/v20/-F6qfjptAgt5VM-kVkqdyU8n3pQPwlBFgsAXHNk.woff2-F6qfjptAgt5VM-kVkqdyU8... https://fonts.gstatic.com/s/ibmplexmono/v20/-F6qfjptAgt5VM-kVkqdyU8n3pQPwlBFgsAXHNk.woff2 — 9.9 KiB — 9 ms — font-display: swaphttps://fonts.gstatic.com/s/ibmplexsans/v23/zYXzKVElMYYaJe8bpLHnCwDKr932-G7dytD-Dmu1syxeKYbSB4Zh.woff2zYXzKVElMYYaJe8bpLHnCwD... https://fonts.gstatic.com/s/ibmplexsans/v23/zYXzKVElMYYaJe8bpLHnCwDKr932-G7dytD-Dmu1syxeKYbSB4Zh.woff2 — 39.3 KiB — 15 ms — font-display: swaphttps://fonts.gstatic.com/s/anton/v27/1Ptgg87LROyAm3Kz-C8CSKlv.woff21Ptgg87LROyAm3Kz-C8CSKl... https://fonts.gstatic.com/s/anton/v27/1Ptgg87LROyAm3Kz-C8CSKlv.woff2 — 11.7 KiB — 16 ms — font-display: swaphttps://fonts.gstatic.com/s/sourceserif4/v15/vEFI2_tTDB4M7-auWDN0ahZJW1gb8te1Xb7G.woff2vEFI2_tTDB4M7-auWDN0ahZ... https://fonts.gstatic.com/s/sourceserif4/v15/vEFI2_tTDB4M7-auWDN0ahZJW1gb8te1Xb7G.woff2 — 119.3 KiB — 18 ms — font-display: swaphttps://fonts.gstatic.com/s/ibmplexmono/v20/-F6qfjptAgt5VM-kVkqdyU8n3vAOwlBFgsAXHNk.woff2-F6qfjptAgt5VM-kVkqdyU8... https://fonts.gstatic.com/s/ibmplexmono/v20/-F6qfjptAgt5VM-kVkqdyU8n3vAOwlBFgsAXHNk.woff2 — 9.9 KiB — 18 ms — font-display: swap
-F6qfjptAgt5VM-kVkqdyU8... woff2 swap
Size 10 KB
Load time 9 ms
Start 299 ms
Risk FOUT — text flashes from fallback to web font
zYXzKVElMYYaJe8bpLHnCwD... woff2 swap
Size 39 KB
Load time 15 ms
Start 303 ms
Risk FOUT — text flashes from fallback to web font
1Ptgg87LROyAm3Kz-C8CSKl... woff2 swap
Size 12 KB
Load time 16 ms
Start 304 ms
Risk FOUT — text flashes from fallback to web font
vEFI2_tTDB4M7-auWDN0ahZ... woff2 swap
Size 119 KB
Load time 18 ms
Start 304 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
-F6qfjptAgt5VM-kVkqdyU8... woff2 swap
Size 10 KB
Load time 18 ms
Start 304 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~60 KB and ~120 ms

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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
2
preload
2
dns-prefetch
—
prefetch
—

4 resource hints configured

A+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Document Compression
Document response uses brotli
PASS
Document response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server-Timing Observability
3 Server-Timing entries advertised
PASS
3 Server-Timing entries advertised
Info::
Server-Timing header advertises 3 timing entries
A
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Warning::
Compressed response missing `Vary` header
The page is served with `Content-Encoding: br` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A
Page Weight Inventory
35 resources · 552 KB · 112 KB savings available
PASS
35 resources · 552 KB · 112 KB savings available
Info::
Within 1MB page-weight target
Got: 552 KB
Info::
~112 KB of savings available
Warning::
17 third-party resources (71% of weight)
35 resources · 551.7 KiB · 17 third-party Within 1MB page-weight target
JavaScript 56% · 308.4 KiB
Font 34% · 190.3 KiB
CSS 5% · 28.0 KiB
Document 3% · 14.0 KiB
Other 1% · 5.6 KiB
Image 1% · 5.4 KiB

~112.4 KiB of savings available

Remove unused JavaScript: 112.4 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
A+
JavaScript Blocking
No render-blocking JS or document.write usage detected
PASS
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
35 requests over 1024ms
INFO
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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
35% of JavaScript execution is third-party
First-party Third-party 572ms · 183KB · €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 347ms
Transfer 157 KB
Unused 43%
Monthly Cost €4/mo
Microsoft Clarity
Session Replay
Costly
Execution 225ms
Transfer 25 KB
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 347ms and costs ~€4/month
  • Microsoft Clarity adds 225ms and costs ~€2/month

Google Tag Manager takes 347ms 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

Microsoft Clarity takes 225ms 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

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-09-05 — 2026-10-02)

LCP (p75)

1941 ms

86% good

INP (p75)

72 ms

98% good

CLS (p75)

0.000

97% good

FCP (p75)

1941 ms

TTFB (p75)

1380 ms

This origin passes Core Web Vitals assessment
Image Optimization
2 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

2

Total Size

0 KB

1 missing alt text 1 missing lazy loading
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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