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https://gaokaoexam.org/subjects/english/practice/2025-national-paper-1

Performance

· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
93
GRADE
A
FIX
1
REVIEW
4
PASS
14
INFO
4

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

Mobile Desktop
97
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.

963 ms

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

1.05 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.

0.019

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

963 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.

1.05 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
23
14 PASS 4 REVIEW 1 FIX
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.

B
Third-Party Impact
45% third-party, 0 ms blocking
REVIEW
45% third-party, 0 ms blocking
Info::
Third-party code accounts for 45% of page weight (201.9 KiB of 452.6 KiB)
Info::
Third-party blocking time is low (0 ms)
55%
45%
First-party Third-party
B
JS Bundles
11 scripts, 82 KB unused
REVIEW
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.

ScriptSizeUnusedMinifiedParty
https://gaokaoexam.org/assets/math-text-DF4GpgNe.js79 KB36 KB (46%)✓1st
https://gaokaoexam.org/assets/jsx-runtime-BilL7PSO.js39 KB24 KB (61%)✓1st
https://gaokaoexam.org/assets/entry.client-DPaSBi4y.js59 KB23 KB (39%)✓1st
https://gaokaoexam.org/assets/root-BXZ4ovJd.js4 KB—✓1st
https://gaokaoexam.org/assets/subject-navigation-context-bwKp6e5N.js5 KB—✓1st
https://gaokaoexam.org/assets/ga4-funnel.client-BdMSIfLX.js3 KB—✓1st
https://gaokaoexam.org/assets/exam-gate-CTHjN2lg.js5 KB—✓1st
https://gaokaoexam.org/assets/site-chrome-DVwGL8KW.js2 KB—✓1st
https://gaokaoexam.org/assets/paper-route-DZ5FolEU.js1 KB—✓1st
https://gaokaoexam.org/assets/question-selection-hJmU0Y2n.js1 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

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.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
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 Budget
453 KB transferred, 25 requests
PASS
453 KB transferred, 25 requests
Info::
Page weighs 1010 KB (453 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
453 KB / 2.4 MB budget
453 KB transferred
25 requests
0.09 g CO2 per page load
Fonts 200.1 KiB 44%
JavaScript 198.4 KiB 44%
CSS 28.4 KiB 6%
HTML 19.9 KiB 4%
Other 3.0 KiB 1%
Other 1.1 KiB 0%
Images 833 B 0%
Other 823 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 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
1 images, 0 KB saveable
PASS
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+
JS Execution Cost
246ms total JS execution
PASS
246ms total JS execution
Info::
https://gaokaoexam.org/subjects/english/practice/2...: 115ms CPU time
Info::
https://gaokaoexam.org/assets/entry.client-DPaSBi4...: 68ms CPU time
Info::
Unattributable: 62ms CPU time

Main Thread Breakdown

Style & Layout 34% Other 30% Script Evaluation 28% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://gaokaoexam.org/subjects/english/practice/2025-national-paper-1115ms3ms3ms1st
https://gaokaoexam.org/assets/entry.client-DPaSBi4y.js68ms61ms0ms1st
Unattributable62ms6ms0ms1st
A+
Font Loading
6 fonts (200 KB)
PASS
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)
0 ms 500 ms 1.0 s FCP 963 ms LCP 1.0 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 — 33 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 — 97 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 — 65 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 — 56 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 — 122 ms — font-display: swaphttps://fonts.gstatic.com/s/ibmplexmono/v20/-F63fjptAgt5VM-kVkqdyU8n1i8q131nj-o.woff2-F63fjptAgt5VM-kVkqdyU8... https://fonts.gstatic.com/s/ibmplexmono/v20/-F63fjptAgt5VM-kVkqdyU8n1i8q131nj-o.woff2 — 9.8 KiB — 74 ms — font-display: swap
-F6qfjptAgt5VM-kVkqdyU8... woff2 swap
Size 10 KB
Load time 33 ms
Start 317 ms
Risk FOUT — text flashes from fallback to web font
zYXzKVElMYYaJe8bpLHnCwD... woff2 swap
Size 39 KB
Load time 97 ms
Start 317 ms
Risk FOUT — text flashes from fallback to web font
1Ptgg87LROyAm3Kz-C8CSKl... woff2 swap
Size 12 KB
Load time 65 ms
Start 317 ms
Risk FOUT — text flashes from fallback to web font
-F6qfjptAgt5VM-kVkqdyU8... woff2 swap
Size 10 KB
Load time 56 ms
Start 317 ms
Risk FOUT — text flashes from fallback to web font
vEFI2_tTDB4M7-auWDN0ahZ... woff2 swap
Size 119 KB
Load time 122 ms
Start 317 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 74 ms
Start 318 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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 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
25 resources · 453 KB · 82 KB savings available
PASS
25 resources · 453 KB · 82 KB savings available
Info::
Within 1MB page-weight target
Got: 453 KB
Info::
~82 KB of savings available
Warning::
7 third-party resources (45% of weight)
25 resources · 452.6 KiB · 7 third-party Within 1MB page-weight target
Font 44% · 200.1 KiB
JavaScript 44% · 198.4 KiB
CSS 6% · 28.4 KiB
Document 4% · 19.9 KiB
Image 1% · 3.8 KiB
Other 0% · 1.9 KiB

~81.9 KiB of savings available

Remove unused JavaScript: 81.9 KiB
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
25 requests over 519ms
INFO
0 ms 500 ms 1.0 s FCP 963 ms LCP 1.0 shttps://gaokaoexam.org/subjects/english/practice/2025-national-paper-1/subjects/english/practice/2025-nat... https://gaokaoexam.org/subjects/english/practice/2025-national-paper-1 — 200 — 19.9 KiB — 102 ms — h3https://gaokaoexam.org/brand/gaokao-mark.svg/brand/gaokao-mark.svg https://gaokaoexam.org/brand/gaokao-mark.svg — 200 — 833 B — 61 ms — h3https://gaokaoexam.org/assets/entry.client-DPaSBi4y.js/assets/entry.client-DPaSBi4y.js https://gaokaoexam.org/assets/entry.client-DPaSBi4y.js — 200 — 59.1 KiB — 84 ms — h3https://gaokaoexam.org/assets/jsx-runtime-BilL7PSO.js/assets/jsx-runtime-BilL7PSO.js https://gaokaoexam.org/assets/jsx-runtime-BilL7PSO.js — 200 — 39.3 KiB — 96 ms — h3https://gaokaoexam.org/assets/root-BXZ4ovJd.js/assets/root-BXZ4ovJd.js https://gaokaoexam.org/assets/root-BXZ4ovJd.js — 200 — 3.7 KiB — 89 ms — h3https://gaokaoexam.org/assets/subject-navigation-context-bwKp6e5N.js/assets/subject-navigation-context-... https://gaokaoexam.org/assets/subject-navigation-context-bwKp6e5N.js — 200 — 5.1 KiB — 89 ms — h3https://gaokaoexam.org/assets/ga4-funnel.client-BdMSIfLX.js/assets/ga4-funnel.client-BdMSIfLX.... https://gaokaoexam.org/assets/ga4-funnel.client-BdMSIfLX.js — 200 — 2.8 KiB — 94 ms — h3https://gaokaoexam.org/assets/exam-gate-CTHjN2lg.js/assets/exam-gate-CTHjN2lg.js https://gaokaoexam.org/assets/exam-gate-CTHjN2lg.js — 200 — 5.4 KiB — 94 ms — h3https://gaokaoexam.org/assets/site-chrome-DVwGL8KW.js/assets/site-chrome-DVwGL8KW.js https://gaokaoexam.org/assets/site-chrome-DVwGL8KW.js — 200 — 1.8 KiB — 60 ms — h3https://gaokaoexam.org/assets/paper-route-DZ5FolEU.js/assets/paper-route-DZ5FolEU.js https://gaokaoexam.org/assets/paper-route-DZ5FolEU.js — 200 — 671 B — 94 ms — h3https://gaokaoexam.org/assets/math-text-DF4GpgNe.js/assets/math-text-DF4GpgNe.js https://gaokaoexam.org/assets/math-text-DF4GpgNe.js — 200 — 78.7 KiB — 100 ms — h3https://gaokaoexam.org/assets/question-selection-hJmU0Y2n.js/assets/question-selection-hJmU0Y2n... https://gaokaoexam.org/assets/question-selection-hJmU0Y2n.js — 200 — 802 B — 94 ms — h3https://gaokaoexam.org/assets/subject-templates-lj6toa54.js/assets/subject-templates-lj6toa54.... https://gaokaoexam.org/assets/subject-templates-lj6toa54.js — 200 — 1015 B — 94 ms — h3https://gaokaoexam.org/assets/root-CHVMcx3b.css/assets/root-CHVMcx3b.css https://gaokaoexam.org/assets/root-CHVMcx3b.css — 200 — 26.5 KiB — 80 ms — h3https://fonts.googleapis.com/css2?family=Anton&family=IBM+Plex+Mono:ital,wght@0,400;0,600;0,700;1,400&family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;0,700;1,500&family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,700;1,8..60,600&display=swapfonts.googleapis.com/css2?family=An... https://fonts.googleapis.com/css2?family=Anton&family=IBM+Plex+Mono:ital,wght@0,400;0,600;0,700;1,400&family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;0,700;1,500&family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,700;1,8..60,600&display=swap — 200 — 1.9 KiB — 133 ms — h2https://gaokaoexam.org/manifest.webmanifest/manifest.webmanifest https://gaokaoexam.org/manifest.webmanifest — 200 — 823 B — 77 ms — h3https://fonts.gstatic.com/s/ibmplexmono/v20/-F6qfjptAgt5VM-kVkqdyU8n3pQPwlBFgsAXHNk.woff2fonts.gstatic.com/s/ibmplexmono/v20... https://fonts.gstatic.com/s/ibmplexmono/v20/-F6qfjptAgt5VM-kVkqdyU8n3pQPwlBFgsAXHNk.woff2 — 200 — 9.9 KiB — 33 ms — h3https://fonts.gstatic.com/s/ibmplexsans/v23/zYXzKVElMYYaJe8bpLHnCwDKr932-G7dytD-Dmu1syxeKYbSB4Zh.woff2fonts.gstatic.com/s/ibmplexsans/v23... https://fonts.gstatic.com/s/ibmplexsans/v23/zYXzKVElMYYaJe8bpLHnCwDKr932-G7dytD-Dmu1syxeKYbSB4Zh.woff2 — 200 — 39.3 KiB — 97 ms — h3https://fonts.gstatic.com/s/anton/v27/1Ptgg87LROyAm3Kz-C8CSKlv.woff2fonts.gstatic.com/s/anton/v27/1Ptgg... https://fonts.gstatic.com/s/anton/v27/1Ptgg87LROyAm3Kz-C8CSKlv.woff2 — 200 — 11.7 KiB — 65 ms — h3https://fonts.gstatic.com/s/ibmplexmono/v20/-F6qfjptAgt5VM-kVkqdyU8n3vAOwlBFgsAXHNk.woff2fonts.gstatic.com/s/ibmplexmono/v20... https://fonts.gstatic.com/s/ibmplexmono/v20/-F6qfjptAgt5VM-kVkqdyU8n3vAOwlBFgsAXHNk.woff2 — 200 — 9.9 KiB — 56 ms — h3https://fonts.gstatic.com/s/sourceserif4/v15/vEFI2_tTDB4M7-auWDN0ahZJW1gb8te1Xb7G.woff2fonts.gstatic.com/s/sourceserif4/v1... https://fonts.gstatic.com/s/sourceserif4/v15/vEFI2_tTDB4M7-auWDN0ahZJW1gb8te1Xb7G.woff2 — 200 — 119.3 KiB — 122 ms — h3https://fonts.gstatic.com/s/ibmplexmono/v20/-F63fjptAgt5VM-kVkqdyU8n1i8q131nj-o.woff2fonts.gstatic.com/s/ibmplexmono/v20... https://fonts.gstatic.com/s/ibmplexmono/v20/-F63fjptAgt5VM-kVkqdyU8n1i8q131nj-o.woff2 — 200 — 9.8 KiB — 74 ms — h3https://gaokaoexam.org/__manifest?paths=%2F%2C%2Fcontact%2C%2Fgaokao-101%2C%2Fgaokao-101%2F%2C%2Fprivacy%2C%2Fsubjects%2C%2Fsubjects%2F%2C%2Fsubjects%2Fenglish%2C%2Fsubjects%2Fenglish%2F%2C%2Fsubjects%2Fenglish%2Fpractice%2C%2Fsubjects%2Fenglish%2Fpractice%2F2025-national-paper-1%2C%2Fsubjects%2Fmath%2C%2Fsubjects%2Fmath%2F%2C%2Fsubjects%2Fmath%2Ffull-exams%2C%2Fsubjects%2Fmath%2Ffull-exams%2F2026-shanghai%2C%2Fterms&version=d09bff18/__manifest?paths=%2F%2C%2Fcontact%... https://gaokaoexam.org/__manifest?paths=%2F%2C%2Fcontact%2C%2Fgaokao-101%2C%2Fgaokao-101%2F%2C%2Fprivacy%2C%2Fsubjects%2C%2Fsubjects%2F%2C%2Fsubjects%2Fenglish%2C%2Fsubjects%2Fenglish%2F%2C%2Fsubjects%2Fenglish%2Fpractice%2C%2Fsubjects%2Fenglish%2Fpractice%2F2025-national-paper-1%2C%2Fsubjects%2Fmath%2C%2Fsubjects%2Fmath%2F%2C%2Fsubjects%2Fmath%2Ffull-exams%2C%2Fsubjects%2Fmath%2Ffull-exams%2F2026-shanghai%2C%2Fterms&version=d09bff18 — 200 — 1.1 KiB — 41 ms — h3https://gaokaoexam.org/favicon.svg/favicon.svg https://gaokaoexam.org/favicon.svg — 200 — 746 B — 43 ms — h3https://gaokaoexam.org/icons/icon-192.png/icons/icon-192.png https://gaokaoexam.org/icons/icon-192.png — 200 — 2.3 KiB — 46 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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 (2026-09-17 — 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 Optimization
1 images, 0 KB total, 0 KB wasted
INFO

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.

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