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Performance

· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
3
REVIEW
8
PASS
13
INFO
4

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

Mobile Desktop
46
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
92
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.

11.50 s

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

19.41 s

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

393 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.

11.50 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.

19.45 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
13 PASS 8 REVIEW 3 FIX
F
Page Weight Budget
Action
2.8 MB transferred, 71 requests
FIX
2.8 MB transferred, 71 requests
Warning::
Page weighs 7.5 MB (2.8 MB transferred)
Warning::
JavaScript is 1004 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1004 KB
Info::
Fonts are 1004 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1004 KB
Info::
71 HTTP requests
Info::
Estimated 0.58 g CO2 per page load
2.8 MB / 2.4 MB budget
2.8 MB transferred
71 requests
0.58 g CO2 per page load
JavaScript 1003.7 KiB 35%
Fonts 1003.7 KiB 35%
Images 571.9 KiB 20%
Other 189.6 KiB 7%
CSS 65.1 KiB 2%
HTML 9.5 KiB 0%
Other 1.6 KiB 0%
Other 502 B 0%
Other 187 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

F
JS Bundles
Action
10 scripts, 374 KB unused
FIX
10 scripts, 374 KB unused
Warning::
https://www.asten.nl/typo3temp/assets/compressed/m...: 316 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.asten.nl/typo3temp/assets/compressed/m...: unminified — 199 KB could be saved
Warning::
https://www.asten.nl/stats/matomo.js: 38 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://app.tolkie.nl/: 20 KB unused (11%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 374 KB
374 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.asten.nl/typo3temp/assets/compressed/merged-1d1545afbe90c8f0f5fcec8de3ae73a2-9e7481da4b0dc36b36d53331eb01c9fd.js.gz?1789462809456 KB316 KB (69%)✗1st
https://www.asten.nl/stats/matomo.js67 KB38 KB (56%)✓1st
https://app.tolkie.nl/208 KB20 KB (11%)✓3rd
https://www.asten.nl/typo3temp/assets/compressed/merged-56cd690d88a86a69ee44bd9c43345cec-3931334de3a8e847da48b8f91cf4ed69.js.gz?17894628097 KB—✓1st
https://meldingen.brabantalert.nl/public/widget/97830615e36300bb14c30992096f4a03.js?cookie=false1 KB—✓3rd
https://app-script.monsido.com/v2/monsido-script.js4 KB—✓3rd
https://analytics.silktide.com/d72f4b285a2f4ea86cd5dc508cffe267.js23 KB—✓3rd
https://app.tolkie.nl/tolkie-iframe.js230 KB—✓3rd
https://heatmaps.monsido.com/v1/heatmaps.js3 KB—✓3rd
https://pagecorrect.monsido.com/v1/page-correct.js5 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

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: private, no-store, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-store, max-age=0

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-store—Never cache this response
max-age0Cache for 0 seconds
B
Image Optimization
43 images, 0 KB saveable
REVIEW
43 images, 0 KB saveable
Warning::
https://www.asten.nl/fileadmin/_processed_/7/6/csm... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
43 images 572 KB
0 oversized -0 KB
39 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1837ms total JS execution
REVIEW
1837ms total JS execution
Warning::
Unattributable: 683ms CPU time
Warning::
https://www.asten.nl/typo3temp/assets/compressed/m...: 550ms CPU time
Warning::
https://www.asten.nl/: 282ms CPU time
Warning::
https://app.tolkie.nl/: 258ms CPU time
Info::
https://analytics.silktide.com/d72f4b285a2f4ea86cd...: 64ms CPU time
Info::
Third-party scripts: 322ms (18% of total)

Main Thread Breakdown

Other 36% Script Evaluation 31% Style & Layout 15% Script Parsing & Compilation 13% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable683ms16ms0ms1st
https://www.asten.nl/typo3temp/assets/compressed/merged-1d1545afbe90c8f0f5fcec8de3ae73a2-9e7481da4b0dc36b36d53331eb01c9fd.js.gz?1789462809550ms269ms222ms1st
https://www.asten.nl/282ms5ms2ms1st
https://app.tolkie.nl/258ms222ms2ms3rd
https://analytics.silktide.com/d72f4b285a2f4ea86cd5dc508cffe267.js64ms42ms9ms3rd
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
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.
C
Page Weight Inventory
Action
71 resources · 2.8 MB · 374 KB savings available
REVIEW
71 resources · 2.8 MB · 374 KB savings available
Warning::
Page weight 2.8 MB exceeds 1 MB target by 1.8 MB
Got: 2.8 MB Expected: ≤ 1 MB
Info::
~374 KB of savings available
Info::
22 third-party resources (24% of weight)
Info::
7 resources over 200KB
71 resources · 2.8 MiB · 22 third-party 1.8 MiB over 1MB target
JavaScript 35% · 1003.7 KiB
Font 35% · 1003.7 KiB
Image 27% · 761.0 KiB
CSS 2% · 65.1 KiB
Document 0% · 9.5 KiB
Other 0% · 2.8 KiB

~373.7 KiB of savings available

Remove unused JavaScript: 373.7 KiB
B
JavaScript Blocking
1 JS blocking issue(s) detected
REVIEW
1 JS blocking issue(s) detected
Warning::
5 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Third-Party Impact
24% third-party, 0 ms blocking
PASS
24% third-party, 0 ms blocking
Info::
Third-party code accounts for 24% of page weight (694.8 KiB of 2.8 MiB)
Info::
Third-party blocking time is low (0 ms)
76%
24%
First-party Third-party
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+
Font Loading
4 fonts (1004 KB)
PASS
4 fonts (1004 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

1004 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 11.5 s LCP 19.4 shttps://www.asten.nl/_assets/2009601e7b3590a7075eea5131d0d167/Fonts/AvenirNext-Regular.ttfAvenirNext-Regular.ttf https://www.asten.nl/_assets/2009601e7b3590a7075eea5131d0d167/Fonts/AvenirNext-Regular.ttf — 411.7 KiB — 173 ms — font-display: swaphttps://www.asten.nl/_assets/2009601e7b3590a7075eea5131d0d167/Fonts/AvenirNext-Bold.ttfAvenirNext-Bold.ttf https://www.asten.nl/_assets/2009601e7b3590a7075eea5131d0d167/Fonts/AvenirNext-Bold.ttf — 319.9 KiB — 181 ms — font-display: swaphttps://www.asten.nl/_assets/2009601e7b3590a7075eea5131d0d167/Fonts/AvenirNext-DemiBold.ttfAvenirNext-DemiBold.ttf https://www.asten.nl/_assets/2009601e7b3590a7075eea5131d0d167/Fonts/AvenirNext-DemiBold.ttf — 258.7 KiB — 171 ms — font-display: swaphttps://app.tolkie.nl/fonts/atkinson-hyperlegible-next-latin-700-normal.woff2atkinson-hyperlegible-n... https://app.tolkie.nl/fonts/atkinson-hyperlegible-next-latin-700-normal.woff2 — 13.4 KiB — 19 ms — font-display: swap
AvenirNext-Regular.ttf ttf swap
Size 412 KB
Load time 173 ms
Start 668 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
AvenirNext-Bold.ttf ttf swap
Size 320 KB
Load time 181 ms
Start 669 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
AvenirNext-DemiBold.ttf ttf swap
Size 259 KB
Load time 171 ms
Start 669 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
atkinson-hyperlegible-n... woff2 swap
Size 13 KB
Load time 19 ms
Start 1.4 s
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 ~792 KB and ~1584 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+
Asset Compression
All 1 asset host use brotli
PASS
All 1 asset host use brotli
Info::
app.tolkie.nl serves assets with brotli (assets: 3)
Got: app.tolkie.nl (text/css)
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+
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: private, no-store, max-age=0
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
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+
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+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Network Waterfall
71 requests over 1842ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 11.5 s LCP 19.4 shttps://www.asten.nl// https://www.asten.nl/ — 200 — 8.2 KiB — 189 ms — http/1.1https://www.asten.nl/typo3temp/assets/compressed/99d2a1d1d1eb5930e6ace11a583ad314-60604bbc9bde865f5363bf8b1bf31e2b.css.gz?1789462809/typo3temp/assets/compressed/99d2a1... https://www.asten.nl/typo3temp/assets/compressed/99d2a1d1d1eb5930e6ace11a583ad314-60604bbc9bde865f5363bf8b1bf31e2b.css.gz?1789462809 — 200 — 589 B — 40 ms — http/1.1https://www.asten.nl/typo3temp/assets/compressed/merged-db12504ac66ab2459c2188eb0e223b04-50b073e9130e8d893980675a0aa3a59d.css.gz?1789462809/typo3temp/assets/compressed/merged... https://www.asten.nl/typo3temp/assets/compressed/merged-db12504ac66ab2459c2188eb0e223b04-50b073e9130e8d893980675a0aa3a59d.css.gz?1789462809 — 200 — 48.1 KiB — 174 ms — http/1.1https://www.asten.nl/typo3temp/assets/compressed/merged-1d1545afbe90c8f0f5fcec8de3ae73a2-9e7481da4b0dc36b36d53331eb01c9fd.js.gz?1789462809/typo3temp/assets/compressed/merged... https://www.asten.nl/typo3temp/assets/compressed/merged-1d1545afbe90c8f0f5fcec8de3ae73a2-9e7481da4b0dc36b36d53331eb01c9fd.js.gz?1789462809 — 200 — 455.9 KiB — 278 ms — http/1.1https://www.asten.nl/typo3temp/assets/compressed/merged-56cd690d88a86a69ee44bd9c43345cec-3931334de3a8e847da48b8f91cf4ed69.js.gz?1789462809/typo3temp/assets/compressed/merged... https://www.asten.nl/typo3temp/assets/compressed/merged-56cd690d88a86a69ee44bd9c43345cec-3931334de3a8e847da48b8f91cf4ed69.js.gz?1789462809 — 200 — 7.0 KiB — 110 ms — http/1.1https://meldingen.brabantalert.nl/public/widget/97830615e36300bb14c30992096f4a03.js?cookie=falsemeldingen.brabantalert.nl/public/wi... https://meldingen.brabantalert.nl/public/widget/97830615e36300bb14c30992096f4a03.js?cookie=false — 200 — 1.3 KiB — 133 ms — h2https://www.asten.nl/fileadmin/_processed_/7/6/csm_Foto_header_website_616fc42e27.jpg/fileadmin/_processed_/7/6/csm_Foto... https://www.asten.nl/fileadmin/_processed_/7/6/csm_Foto_header_website_616fc42e27.jpg — 200 — 23.5 KiB — 146 ms — http/1.1https://www.asten.nl/fileadmin/_processed_/c/0/csm_Raadzaal_foto_81835c983a.png/fileadmin/_processed_/c/0/csm_Raad... https://www.asten.nl/fileadmin/_processed_/c/0/csm_Raadzaal_foto_81835c983a.png — 200 — 487.2 KiB — 258 ms — http/1.1https://app.tolkie.nl/app.tolkie.nl/ https://app.tolkie.nl/ — 200 — 207.9 KiB — 141 ms — h2https://app-script.monsido.com/v2/monsido-script.jsapp-script.monsido.com/v2/monsido-s... https://app-script.monsido.com/v2/monsido-script.js — 200 — 3.7 KiB — 83 ms — h2https://analytics.silktide.com/d72f4b285a2f4ea86cd5dc508cffe267.jsanalytics.silktide.com/d72f4b285a2f... https://analytics.silktide.com/d72f4b285a2f4ea86cd5dc508cffe267.js — 200 — 23.1 KiB — 190 ms — h2https://www.asten.nl/_assets/2009601e7b3590a7075eea5131d0d167/Images/logo.svg/_assets/2009601e7b3590a7075eea5131... https://www.asten.nl/_assets/2009601e7b3590a7075eea5131d0d167/Images/logo.svg — 200 — 8.7 KiB — 230 ms — http/1.1https://www.asten.nl/fileadmin/Asten/Afbeeldingen/Iconen/afval_containers.svg/fileadmin/Asten/Afbeeldingen/Icone... https://www.asten.nl/fileadmin/Asten/Afbeeldingen/Iconen/afval_containers.svg — 200 — 1.8 KiB — 325 ms — http/1.1https://www.asten.nl/fileadmin/Asten/Afbeeldingen/Iconen/Melden_en_klacht.svg/fileadmin/Asten/Afbeeldingen/Icone... https://www.asten.nl/fileadmin/Asten/Afbeeldingen/Iconen/Melden_en_klacht.svg — 200 — 1.6 KiB — 330 ms — http/1.1https://www.asten.nl/fileadmin/Asten/Afbeeldingen/Iconen/Aansluiting_stroom_huis.svg/fileadmin/Asten/Afbeeldingen/Icone... https://www.asten.nl/fileadmin/Asten/Afbeeldingen/Iconen/Aansluiting_stroom_huis.svg — 200 — 3.1 KiB — 334 ms — http/1.1https://www.asten.nl/fileadmin/Asten/Afbeeldingen/Iconen/nieuws.svg/fileadmin/Asten/Afbeeldingen/Icone... https://www.asten.nl/fileadmin/Asten/Afbeeldingen/Iconen/nieuws.svg — 200 — 2.2 KiB — 340 ms — http/1.1https://www.asten.nl/fileadmin/Asten/Afbeeldingen/Iconen/Paspoort.svg/fileadmin/Asten/Afbeeldingen/Icone... https://www.asten.nl/fileadmin/Asten/Afbeeldingen/Iconen/Paspoort.svg — 200 — 1.4 KiB — 345 ms — http/1.1https://app.tolkie.nl/tolkie-client.min.cssapp.tolkie.nl/tolkie-client.min.css https://app.tolkie.nl/tolkie-client.min.css — 200 — 3.5 KiB — 19 ms — h2https://www.asten.nl/_assets/2009601e7b3590a7075eea5131d0d167/Images/iconListFill.svg/_assets/2009601e7b3590a7075eea5131... https://www.asten.nl/_assets/2009601e7b3590a7075eea5131d0d167/Images/iconListFill.svg — 200 — 603 B — 53 ms — http/1.1https://www.asten.nl/_assets/2009601e7b3590a7075eea5131d0d167/Images/buttonBgReverse.svg/_assets/2009601e7b3590a7075eea5131... 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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
18% of JavaScript execution is third-party
First-party Third-party 322ms · 231KB · €3/mo
app.tolkie.nl
Other
Costly
Execution 258ms
Transfer 208 KB
Unused 11%
Monthly Cost €3/mo
analytics.silktide.com
Other
Optional
Execution 64ms
Transfer 23 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • app.tolkie.nl adds 258ms and costs ~€3/month

app.tolkie.nl takes 258ms 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 (2026-10-14 — 2026-11-10)

LCP (p75)

1071 ms

95% good

INP (p75)

102 ms

94% good

CLS (p75)

0.000

99% good

FCP (p75)

984 ms

TTFB (p75)

341 ms

This origin passes Core Web Vitals assessment
Image Optimization
32 images, 818 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

32

Total Size

818 KB

6 missing dimensions 30 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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