https://gaokaoexam.org/subjects/english/practice/2025-national-paper-1
Performance
· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
93
GRADE
A
FIX
1
REVIEW
5
PASS
17
INFO
4
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
71
96
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
4.70 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.70 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.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.09 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.
4.70 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 sChecks
2717 PASS 5 REVIEW 1 FIX
FHTTP CachingActionNo cache headersFIX
HTTP Caching
ActionNo cache headers
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.
BThird-Party Impact45% third-party, 0 ms blockingREVIEW
Third-Party Impact
45% third-party, 0 ms blocking
45% third-party, 0 ms blocking
Info::
Third-party code accounts for 45% of page weight (201.9 KiB of 450.8 KiB)
Info::
Third-party blocking time is low (0 ms)
55%
45%
First-party Third-party
BJS Execution Cost706ms total JS executionREVIEW
JS Execution Cost
706ms total JS execution
706ms total JS execution
Info::
https://gaokaoexam.org/subjects/english/practice/2...: 246ms CPU time
Info::
https://gaokaoexam.org/assets/entry.client-DPaSBi4...: 231ms CPU time
Info::
Unattributable: 229ms CPU time
Main Thread Breakdown
Other 36% Script Evaluation 32% Style & Layout 24%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://gaokaoexam.org/subjects/english/practice/2025-national-paper-1 | 246ms | 13ms | 13ms | 1st |
| https://gaokaoexam.org/assets/entry.client-DPaSBi4y.js | 231ms | 207ms | 0ms | 1st |
| Unattributable | 229ms | 24ms | 0ms | 1st |
BJS Bundles11 scripts, 82 KB unusedREVIEW
JS Bundles
11 scripts, 82 KB unused
11 scripts, 82 KB unused
Warning::
https://gaokaoexam.org/assets/math-text-DF4GpgNe.j...: 36 KB unused (46%)
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...: 23 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 82 KB
82 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://gaokaoexam.org/assets/math-text-DF4GpgNe.js | 79 KB | 36 KB (46%) | ✓ | 1st |
| https://gaokaoexam.org/assets/jsx-runtime-BilL7PSO.js | 39 KB | 24 KB (61%) | ✓ | 1st |
| https://gaokaoexam.org/assets/entry.client-DPaSBi4y.js | 59 KB | 23 KB (39%) | ✓ | 1st |
| https://gaokaoexam.org/assets/root-BXZ4ovJd.js | 3 KB | — | ✓ | 1st |
| https://gaokaoexam.org/assets/subject-navigation-context-bwKp6e5N.js | 5 KB | — | ✓ | 1st |
| https://gaokaoexam.org/assets/ga4-funnel.client-BdMSIfLX.js | 3 KB | — | ✓ | 1st |
| https://gaokaoexam.org/assets/exam-gate-CTHjN2lg.js | 5 KB | — | ✓ | 1st |
| https://gaokaoexam.org/assets/site-chrome-DVwGL8KW.js | 2 KB | — | ✓ | 1st |
| https://gaokaoexam.org/assets/paper-route-DZ5FolEU.js | 0 KB | — | ✓ | 1st |
| https://gaokaoexam.org/assets/question-selection-hJmU0Y2n.js | 1 KB | — | ✓ | 1st |
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
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
Main HTML Cache-Control
No Cache-Control header on main HTML response
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.
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
A+Page Weight Budget451 KB transferred, 25 requestsPASS
Page Weight Budget
451 KB transferred, 25 requests
451 KB transferred, 25 requests
Info::
Page weighs 1010 KB (451 KB transferred)
Info::
Fonts are 200 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 200 KB
Info::
25 HTTP requests
Info::
Estimated 0.09 g CO2 per page load
451 KB transferred
25 requests
0.09 g CO2 per page load
Fonts 200.1 KiB 44%
JavaScript 196.9 KiB 44%
CSS 28.3 KiB 6%
HTML 19.9 KiB 4%
Other 3.0 KiB 1%
Other 1.2 KiB 0%
Other 815 B 0%
Images 701 B 0%
0 2.4 MB 4.9 MB
Under budget
Subset fonts to include only used characters, or switch to system font stacks.
Why this matters
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Image Optimization1 images, 0 KB saveablePASS
Image Optimization
1 images, 0 KB saveable
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 1 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+Font Loading6 fonts (200 KB)PASS
Font Loading
6 fonts (200 KB)
6 fonts (200 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
6
200 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
-F6qfjptAgt5VM-kVkqdyU8... woff2 swap
Size 10 KB
Load time 36 ms
Start 282 ms
Risk FOUT — text flashes from fallback to web font
zYXzKVElMYYaJe8bpLHnCwD... woff2 swap
Size 39 KB
Load time 93 ms
Start 294 ms
Risk FOUT — text flashes from fallback to web font
1Ptgg87LROyAm3Kz-C8CSKl... woff2 swap
Size 12 KB
Load time 85 ms
Start 294 ms
Risk FOUT — text flashes from fallback to web font
-F6qfjptAgt5VM-kVkqdyU8... woff2 swap
Size 10 KB
Load time 72 ms
Start 294 ms
Risk FOUT — text flashes from fallback to web font
vEFI2_tTDB4M7-auWDN0ahZ... woff2 swap
Size 119 KB
Load time 123 ms
Start 295 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
-F63fjptAgt5VM-kVkqdyU8... woff2 swap
Size 10 KB
Load time 79 ms
Start 295 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 CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource Hints3 hints, 0 missing preconnectsPASS
Resource Hints
3 hints, 0 missing preconnects
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)
Current Resource Hints
preconnect 2
preload 1
dns-prefetch—
prefetch—
3 resource hints configured
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
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 CompressionDocument response uses brotliPASS
Document Compression
Document response uses brotli
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 PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
AServer Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
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.
APage Weight Inventory25 resources · 451 KB · 82 KB savings availablePASS
Page Weight Inventory
25 resources · 451 KB · 82 KB savings available
25 resources · 451 KB · 82 KB savings available
Info::
Within 1MB page-weight target
Got: 451 KB
Info::
~82 KB of savings available
Warning::
7 third-party resources (45% of weight)
25 resources · 450.8 KiB · 7 third-party Within 1MB page-weight target
Font 44% · 200.1 KiB
JavaScript 44% · 196.9 KiB
CSS 6% · 28.3 KiB
Document 4% · 19.9 KiB
Image 1% · 3.7 KiB
Other 0% · 2.0 KiB
~82.1 KiB of savings available
Remove unused JavaScript: 82.1 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 25 resources | 450.8 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
A+JavaScript BlockingNo render-blocking JS or document.write usage detectedPASS
JavaScript Blocking
No render-blocking JS or document.write usage detected
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
CSS Performance Depth
No CSS performance depth issues detected
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Asset CompressionNo text asset hosts to measureINFO
Asset Compression
No text asset hosts to measure
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 Waterfall25 requests over 507msINFO
Network Waterfall
25 requests over 507ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-09-17 — 2026-10-14)
LCP (p75)
1671 ms
88% good
INP (p75)
78 ms
97% good
CLS (p75)
0.000
94% good
FCP (p75)
1577 ms
TTFB (p75)
1143 ms
This origin passes Core Web Vitals assessment
Image Optimization1 images, 0 KB total, 0 KB wastedINFO
Image Optimization
1 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
1
Total Size
0 KB
1 missing alt text
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.