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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
1
REVIEW
8
PASS
14
INFO
3

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

Mobile Desktop
62
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.59 s

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

5.49 s

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

633 ms

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

0.045

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

3.57 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.

6.93 s

Page Load Progression

377 ms
753 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.6 s
3.0 s
Checks
26
14 PASS 8 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 (295.6 KiB of 656.5 KiB)
Info::
Third-party blocking time is low (0 ms)
55%
45%
First-party Third-party
C
JS Execution Cost
Action
1843ms total JS execution
REVIEW
1843ms total JS execution
Warning::
https://gst-recon.com/chunk-NTLJMCA7.js: 519ms CPU time
Warning::
Unattributable: 400ms CPU time
Warning::
https://gst-recon.com/: 393ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7F5K...: 269ms CPU time
Info::
https://gst-recon.com/polyfills-B6TNHZQ6.js: 162ms CPU time
Info::
Third-party scripts: 369ms (20% of total)

Main Thread Breakdown

Script Evaluation 56% Other 24% Style & Layout 10% Rendering 3% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://gst-recon.com/chunk-NTLJMCA7.js519ms504ms1ms1st
Unattributable400ms94ms0ms1st
https://gst-recon.com/393ms21ms3ms1st
https://www.googletagmanager.com/gtag/js?id=G-7F5KRBT07Y269ms225ms40ms3rd
https://gst-recon.com/polyfills-B6TNHZQ6.js162ms144ms0ms1st
https://apis.google.com/_/scs/abc-static/_/js/k=gapi.lb.en.etOqPKhAhvg.O/m=gapi_iframes/rt=j/sv=1/d=1/ed=1/rs=AHpOoo-l5JrVgGKVELwC844E6riBHX86-w/cb=gapi.loaded_0?le=scs100ms88ms10ms3rd
B
JS Bundles
26 scripts, 128 KB unused
REVIEW
26 scripts, 128 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7F5K...: 70 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://gst-recon.com/main-J5EHXBM3.js: 37 KB unused (31%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://gst-recon.com/chunk-35DTMPFY.js: 20 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 128 KB
128 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-7F5KRBT07Y160 KB70 KB (44%)✓3rd
https://gst-recon.com/main-J5EHXBM3.js119 KB37 KB (31%)✓1st
https://gst-recon.com/chunk-35DTMPFY.js53 KB20 KB (38%)✓1st
https://gst-recon.com/chunk-IBSCHJSJ.js1 KB—✓1st
https://gst-recon.com/chunk-WRWXI3SN.js1 KB—✓1st
https://gst-recon.com/chunk-ZVRPNGVC.js1 KB—✓1st
https://gst-recon.com/chunk-FN7UTOOT.js1 KB—✓1st
https://gst-recon.com/chunk-JVEYNH6V.js1 KB—✓1st
https://gst-recon.com/chunk-7Y2YVMO3.js1 KB—✓1st
https://gst-recon.com/chunk-YQB2XRXQ.js6 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
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.
C
Document Compression
Action
Document response served uncompressed
REVIEW
Document response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
657 KB transferred, 37 requests
PASS
657 KB transferred, 37 requests
Info::
Page weighs 1.9 MB (657 KB transferred)
Warning::
JavaScript is 617 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 617 KB
Info::
37 HTTP requests
Info::
Estimated 0.13 g CO2 per page load
657 KB / 2.4 MB budget
657 KB transferred
37 requests
0.13 g CO2 per page load
JavaScript 616.8 KiB 94%
CSS 23.9 KiB 4%
HTML 8.0 KiB 1%
Other 4.3 KiB 1%
Other 1.6 KiB 0%
Other 1.5 KiB 0%
Other 395 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under 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

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
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 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+
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+
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
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
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
37 resources · 657 KB · 128 KB savings available
PASS
37 resources · 657 KB · 128 KB savings available
Info::
Within 1MB page-weight target
Got: 657 KB
Info::
~128 KB of savings available
Warning::
8 third-party resources (45% of weight)
37 resources · 656.5 KiB · 8 third-party Within 1MB page-weight target
JavaScript 94% · 616.8 KiB
CSS 4% · 23.9 KiB
Document 1% · 8.0 KiB
Image 1% · 4.3 KiB
Other 1% · 3.4 KiB

~127.5 KiB of savings available

Remove unused JavaScript: 127.5 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
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
37 requests over 3162ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.6 s LCP 5.5 shttp://gst-recon.com// http://gst-recon.com/ — 307 — 0 B — 3 ms — http/1.1https://gst-recon.com// https://gst-recon.com/ — 200 — 7.5 KiB — 489 ms — h2https://gst-recon.com/chunk-FN7UTOOT.js/chunk-FN7UTOOT.js https://gst-recon.com/chunk-FN7UTOOT.js — 200 — 913 B — 167 ms — h2https://gst-recon.com/chunk-R5K77BIP.js/chunk-R5K77BIP.js https://gst-recon.com/chunk-R5K77BIP.js — 200 — 1.6 KiB — 168 ms — h2https://gst-recon.com/chunk-BKHXTO7K.js/chunk-BKHXTO7K.js https://gst-recon.com/chunk-BKHXTO7K.js — 200 — 1.2 KiB — 168 ms — h2https://gst-recon.com/chunk-H2K5LRVB.js/chunk-H2K5LRVB.js https://gst-recon.com/chunk-H2K5LRVB.js — 200 — 4.6 KiB — 169 ms — h2https://gst-recon.com/chunk-2SNOCUNG.js/chunk-2SNOCUNG.js https://gst-recon.com/chunk-2SNOCUNG.js — 200 — 1005 B — 169 ms — h2https://gst-recon.com/chunk-ZVRPNGVC.js/chunk-ZVRPNGVC.js https://gst-recon.com/chunk-ZVRPNGVC.js — 200 — 1.2 KiB — 169 ms — h2https://gst-recon.com/chunk-IBSCHJSJ.js/chunk-IBSCHJSJ.js https://gst-recon.com/chunk-IBSCHJSJ.js — 200 — 774 B — 170 ms — h2https://gst-recon.com/chunk-JVEYNH6V.js/chunk-JVEYNH6V.js https://gst-recon.com/chunk-JVEYNH6V.js — 200 — 909 B — 170 ms — h2https://gst-recon.com/chunk-7Y2YVMO3.js/chunk-7Y2YVMO3.js https://gst-recon.com/chunk-7Y2YVMO3.js — 200 — 627 B — 171 ms — h2https://gst-recon.com/chunk-YQB2XRXQ.js/chunk-YQB2XRXQ.js https://gst-recon.com/chunk-YQB2XRXQ.js — 200 — 5.7 KiB — 171 ms — h2https://gst-recon.com/polyfills-B6TNHZQ6.js/polyfills-B6TNHZQ6.js https://gst-recon.com/polyfills-B6TNHZQ6.js — 200 — 13.7 KiB — 321 ms — h2https://gst-recon.com/main-J5EHXBM3.js/main-J5EHXBM3.js https://gst-recon.com/main-J5EHXBM3.js — 200 — 119.4 KiB — 484 ms — h2https://www.googletagmanager.com/gtag/js?id=G-7F5KRBT07Ywww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-7F5KRBT07Y — 200 — 160.1 KiB — 209 ms — h2https://gst-recon.com/styles-YCJL5FUE.css/styles-YCJL5FUE.css https://gst-recon.com/styles-YCJL5FUE.css — 200 — 23.9 KiB — 483 ms — h2https://gst-recon.com/manifest.webmanifest/manifest.webmanifest https://gst-recon.com/manifest.webmanifest — 200 — 1.6 KiB — 467 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-7F5KRBT07Y&gtm=45je6b50h2v9235690454za208zd9235690454xf1&_p=1793974218894&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&cid=1262925287.1793974219&frm=0&ngs=1&pscdl=noapi&rcb=0&sr=412x823&uaa=&uab=64&uafvl=Not%253AA-Brand%3B8.0.0.0%7CChromium%3B156.0.8078.79&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115938465~115938468~118897920~118897930~120213116~120385422~120412528~120420414~120469145~120469153~121246026~121246034~123814185~124013661&sid=1793974219&sct=1&seg=0&dl=https%3A%2F%2Fgst-recon.com%2F&dt=GST%20Reconciliation%20Software%20for%20GSTR-1%2C%202A%2C%202B%20%26%203B%20%7C%20GST%20Recon&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=802region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-7F5KRBT07Y&gtm=45je6b50h2v9235690454za208zd9235690454xf1&_p=1793974218894&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&cid=1262925287.1793974219&frm=0&ngs=1&pscdl=noapi&rcb=0&sr=412x823&uaa=&uab=64&uafvl=Not%253AA-Brand%3B8.0.0.0%7CChromium%3B156.0.8078.79&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115938465~115938468~118897920~118897930~120213116~120385422~120412528~120420414~120469145~120469153~121246026~121246034~123814185~124013661&sid=1793974219&sct=1&seg=0&dl=https%3A%2F%2Fgst-recon.com%2F&dt=GST%20Reconciliation%20Software%20for%20GSTR-1%2C%202A%2C%202B%20%26%203B%20%7C%20GST%20Recon&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=802 — 204 — 546 B — 96 ms — h2https://gst-recon.com/chunk-2J4ZIVJY.js/chunk-2J4ZIVJY.js https://gst-recon.com/chunk-2J4ZIVJY.js — 200 — 1.2 KiB — 162 ms — h2https://gst-recon.com/chunk-WRWXI3SN.js/chunk-WRWXI3SN.js https://gst-recon.com/chunk-WRWXI3SN.js — 200 — 1.5 KiB — 162 ms — h2https://gst-recon.com/chunk-VDWEWXQ7.js/chunk-VDWEWXQ7.js https://gst-recon.com/chunk-VDWEWXQ7.js — 200 — 29.0 KiB — 172 ms — h2https://gst-recon.com/chunk-BREA6RPT.js/chunk-BREA6RPT.js https://gst-recon.com/chunk-BREA6RPT.js — 200 — 12.4 KiB — 166 ms — h2https://gst-recon.com/chunk-QOJCY3VD.js/chunk-QOJCY3VD.js https://gst-recon.com/chunk-QOJCY3VD.js — 200 — 10.3 KiB — 167 ms — h2https://gst-recon.com/chunk-CHOLO54W.js/chunk-CHOLO54W.js https://gst-recon.com/chunk-CHOLO54W.js — 200 — 1.1 KiB — 167 ms — h2https://gst-recon.com/chunk-AHYUPJTK.js/chunk-AHYUPJTK.js https://gst-recon.com/chunk-AHYUPJTK.js — 200 — 650 B — 167 ms — h2https://gst-recon.com/chunk-35DTMPFY.js/chunk-35DTMPFY.js https://gst-recon.com/chunk-35DTMPFY.js — 200 — 53.3 KiB — 176 ms — h2https://gst-recon.com/chunk-NTLJMCA7.js/chunk-NTLJMCA7.js https://gst-recon.com/chunk-NTLJMCA7.js — 200 — 60.8 KiB — 176 ms — h2https://gst-recon.com/chunk-ACKELEN3.js/chunk-ACKELEN3.js https://gst-recon.com/chunk-ACKELEN3.js — 200 — 1.1 KiB — 174 ms — h2https://gst-recon.com/gst/billing/plans/gst/billing/plans https://gst-recon.com/gst/billing/plans — 200 — 966 B — 160 ms — h2https://gst-recon.com/favicon.svg/favicon.svg https://gst-recon.com/favicon.svg — 200 — 817 B — 159 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.6 s LCP 5.5 shttp://gst-recon.com// http://gst-recon.com/ — 307 — 0 B — 3 ms — http/1.1https://gst-recon.com// https://gst-recon.com/ — 200 — 7.5 KiB — 489 ms — h2https://gst-recon.com/chunk-FN7UTOOT.js/chunk-FN7UTOOT.js https://gst-recon.com/chunk-FN7UTOOT.js — 200 — 913 B — 167 ms — h2https://gst-recon.com/chunk-R5K77BIP.js/chunk-R5K77BIP.js https://gst-recon.com/chunk-R5K77BIP.js — 200 — 1.6 KiB — 168 ms — h2https://gst-recon.com/chunk-BKHXTO7K.js/chunk-BKHXTO7K.js https://gst-recon.com/chunk-BKHXTO7K.js — 200 — 1.2 KiB — 168 ms — h2https://gst-recon.com/chunk-H2K5LRVB.js/chunk-H2K5LRVB.js https://gst-recon.com/chunk-H2K5LRVB.js — 200 — 4.6 KiB — 169 ms — h2https://gst-recon.com/chunk-2SNOCUNG.js/chunk-2SNOCUNG.js https://gst-recon.com/chunk-2SNOCUNG.js — 200 — 1005 B — 169 ms — h2https://gst-recon.com/chunk-ZVRPNGVC.js/chunk-ZVRPNGVC.js https://gst-recon.com/chunk-ZVRPNGVC.js — 200 — 1.2 KiB — 169 ms — h2https://gst-recon.com/chunk-IBSCHJSJ.js/chunk-IBSCHJSJ.js https://gst-recon.com/chunk-IBSCHJSJ.js — 200 — 774 B — 170 ms — h2https://gst-recon.com/chunk-JVEYNH6V.js/chunk-JVEYNH6V.js https://gst-recon.com/chunk-JVEYNH6V.js — 200 — 909 B — 170 ms — h2https://gst-recon.com/chunk-7Y2YVMO3.js/chunk-7Y2YVMO3.js https://gst-recon.com/chunk-7Y2YVMO3.js — 200 — 627 B — 171 ms — h2https://gst-recon.com/chunk-YQB2XRXQ.js/chunk-YQB2XRXQ.js https://gst-recon.com/chunk-YQB2XRXQ.js — 200 — 5.7 KiB — 171 ms — h2https://gst-recon.com/polyfills-B6TNHZQ6.js/polyfills-B6TNHZQ6.js https://gst-recon.com/polyfills-B6TNHZQ6.js — 200 — 13.7 KiB — 321 ms — h2https://gst-recon.com/main-J5EHXBM3.js/main-J5EHXBM3.js https://gst-recon.com/main-J5EHXBM3.js — 200 — 119.4 KiB — 484 ms — h2https://www.googletagmanager.com/gtag/js?id=G-7F5KRBT07Ywww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-7F5KRBT07Y — 200 — 160.1 KiB — 209 ms — 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200 — 93.1 KiB — 519 ms — h2https://www.googleapis.com/identitytoolkit/v3/relyingparty/getProjectConfig?key=AIzaSyAa5knN8QpYL5MKnFdVBs2rbNAhOhWZsfs&cb=1793974221090www.googleapis.com/identitytoolkit/... https://www.googleapis.com/identitytoolkit/v3/relyingparty/getProjectConfig?key=AIzaSyAa5knN8QpYL5MKnFdVBs2rbNAhOhWZsfs&cb=1793974221090 — 200 — 0 B — 294 ms — h2https://www.googleapis.com/identitytoolkit/v3/relyingparty/getProjectConfig?key=AIzaSyAa5knN8QpYL5MKnFdVBs2rbNAhOhWZsfs&cb=1793974221090www.googleapis.com/identitytoolkit/... https://www.googleapis.com/identitytoolkit/v3/relyingparty/getProjectConfig?key=AIzaSyAa5knN8QpYL5MKnFdVBs2rbNAhOhWZsfs&cb=1793974221090 — 200 — 395 B — 159 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
20% of JavaScript execution is third-party
First-party Third-party 369ms · 195KB · $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 269ms
Transfer 160 KB
Unused 44%
Monthly Cost $5/mo
apis.google.com
Other
Optional
Execution 100ms
Transfer 35 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 269ms and costs ~$5/month

Google Tag Manager takes 269ms 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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