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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
63
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
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.
85
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.

1.04 s

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

5.16 s

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

205 ms

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

0.103

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

1.87 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.

5.16 s

Page Load Progression

535 ms
1.1 s
1.6 s
2.1 s
2.7 s
3.2 s
3.7 s
4.3 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.9 MB transferred, 100 requests
FIX
3.9 MB transferred, 100 requests
Critical::
Page weighs 7.6 MB (3.9 MB transferred)
Warning::
Images are 2.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.6 MB
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
100 HTTP requests
Info::
Estimated 0.83 g CO2 per page load
3.9 MB / 2.4 MB budget
3.9 MB transferred
100 requests
0.83 g CO2 per page load
Images 2.6 MiB 65%
JavaScript 1.1 MiB 27%
Other 81.9 KiB 2%
Other 71.8 KiB 2%
CSS 67.9 KiB 2%
Fonts 43.4 KiB 1%
HTML 31.5 KiB 1%
Other 3.0 KiB 0%
Other 1.9 KiB 0%
Other 1.7 KiB 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

D
Third-Party Impact
Action
96% third-party, 0 ms blocking
FIX
96% third-party, 0 ms blocking
Warning::
Third-party code accounts for 96% of page weight (3.8 MiB of 3.9 MiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
F
JS Bundles
Action
21 scripts, 600 KB unused
FIX
21 scripts, 600 KB unused
Warning::
https://assets.habr.com/habr-web/release_2.313.1/j...: 169 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.habr.com/habr-web/release_2.313.1/j...: 112 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://yastatic.net/partner-code-bundles/1304651/...: 105 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-S28W...: 59 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://yandex.ru/ads/system/context.js: 53 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 600 KB
600 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets.habr.com/habr-web/release_2.313.1/js/app.5bdd563f.js293 KB169 KB (58%)✓3rd
https://assets.habr.com/habr-web/release_2.313.1/js/chunk-vendors.c6f1c2dc.js214 KB112 KB (53%)✓3rd
https://yastatic.net/partner-code-bundles/1304651/00cc0164cd639ddf.js130 KB105 KB (81%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-S28W1WC23F168 KB59 KB (35%)✓3rd
https://yandex.ru/ads/system/context.js105 KB53 KB (51%)✓3rd
https://yandex.ru/ads/system/context.js0 KB53 KB (51%)✓3rd
https://mc.yandex.ru/metrika/tag.js85 KB49 KB (58%)✓3rd
https://cdn.skcrtxr.com/roxot-wrapper/js/roxot-manager.js?pid=c427193e-c45c-4b31-b9de-0d5bc41115fd5 KB—✓3rd
https://yastatic.net/partner-code-bundles/1304651/22d10f9d8e892aab.js32 KB—✓3rd
https://rap.skcrtxr.com/pub/rap.js7 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

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

F
Page Weight Inventory
Action
100 resources · 3.9 MB · 600 KB savings available
FIX
100 resources · 3.9 MB · 600 KB savings available
Warning::
Page weight 2.9 MB over 1MB target
Got: 3.9 MB Expected: ≤ 1 MB
Info::
~600 KB of savings available
Warning::
80 third-party resources (96% of weight)
Info::
3 resources over 200KB
100 resources · 3.9 MiB · 80 third-party 2.9 MiB over 1MB target
Image 67% · 2.6 MiB
JavaScript 27% · 1.1 MiB
Other 2% · 90.9 KiB
CSS 2% · 67.9 KiB
Font 1% · 43.4 KiB
Document 1% · 33.7 KiB

~600.4 KiB of savings available

Remove unused JavaScript: 600.4 KiB
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: no-cache, no-store, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, no-store, must-revalidate

DirectiveValueMeaning
no-cache—Cache but always revalidate first
no-store—Never cache this response
must-revalidate—Must recheck with server after expiry
B
Image Optimization
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
https://habr.com/img/promo-banner.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35 images 2.6 MB
0 oversized -0 KB
32 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
1267ms total JS execution
REVIEW
1267ms total JS execution
Warning::
https://assets.habr.com/habr-web/release_2.313.1/j...: 501ms CPU time
Warning::
Unattributable: 335ms CPU time
Info::
https://habr.com/en/feed/: 236ms CPU time
Info::
https://assets.habr.com/habr-web/release_2.313.1/j...: 126ms CPU time
Info::
https://rap.skcrtxr.com/pub/rap.js: 69ms CPU time
Warning::
Third-party scripts: 1031ms (81% of total)

Main Thread Breakdown

Script Evaluation 50% Other 26% Style & Layout 8% Script Parsing & Compilation 7% Rendering 4% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://assets.habr.com/habr-web/release_2.313.1/js/app.5bdd563f.js501ms441ms24ms3rd
Unattributable335ms23ms0ms3rd
https://habr.com/en/feed/236ms5ms4ms1st
https://assets.habr.com/habr-web/release_2.313.1/js/chunk-vendors.c6f1c2dc.js126ms71ms21ms3rd
https://rap.skcrtxr.com/pub/rap.js69ms53ms0ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
2 fonts (43 KB)
PASS
2 fonts (43 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

43 KB total

Render-blocking

0

of 2

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 FCP 1.0 s LCP 5.2 shttps://fonts.gstatic.com/s/firasans/v17/va9B4kDNxMZdWfMOD5VnZKveRhf6Xl7Glw.woff2va9B4kDNxMZdWfMOD5VnZKv... https://fonts.gstatic.com/s/firasans/v17/va9B4kDNxMZdWfMOD5VnZKveRhf6Xl7Glw.woff2 — 17.4 KiB — 25 ms — font-display: swaphttps://yastatic.net/s3/home/fonts/ys/3/text-variable-full.woff2text-variable-full.woff2 https://yastatic.net/s3/home/fonts/ys/3/text-variable-full.woff2 — 26.1 KiB — 289 ms — font-display: swap
va9B4kDNxMZdWfMOD5VnZKv... woff2 swap
Size 17 KB
Load time 25 ms
Start 720 ms
Risk FOUT — text flashes from fallback to web font
text-variable-full.woff2 woff2 swap
Size 26 KB
Load time 289 ms
Start 1.1 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)
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
Network Waterfall
100 requests over 16993ms
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 FCP 1.0 s LCP 5.2 shttps://habr.com// https://habr.com/ — 302 — 643 B — 163 ms — h2https://habr.com/en/feed//en/feed/ https://habr.com/en/feed/ — 200 — 31.5 KiB — 161 ms — h2https://assets.habr.com/habr-web/release_2.313.1/css/theme/light-v2.313.1.cssassets.habr.com/habr-web/release_2.... https://assets.habr.com/habr-web/release_2.313.1/css/theme/light-v2.313.1.css — 200 — 954 B — 240 ms — h2https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900fonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900 — 200 — 1.1 KiB — 108 ms — h2https://rap.skcrtxr.com/pub/pg/e40a4600-273c-4ae8-a7fd-74ad2f469a15/run-rap.jsrap.skcrtxr.com/pub/pg/e40a4600-273... https://rap.skcrtxr.com/pub/pg/e40a4600-273c-4ae8-a7fd-74ad2f469a15/run-rap.js — 200 — 12.1 KiB — 297 ms — http/1.1https://assets.habr.com/habr-web/release_2.313.1/js/chunk-vendors.c6f1c2dc.jsassets.habr.com/habr-web/release_2.... https://assets.habr.com/habr-web/release_2.313.1/js/chunk-vendors.c6f1c2dc.js — 200 — 213.5 KiB — 462 ms — h2https://assets.habr.com/habr-web/release_2.313.1/css/app.05feb4d8.cssassets.habr.com/habr-web/release_2.... https://assets.habr.com/habr-web/release_2.313.1/css/app.05feb4d8.css — 200 — 58.6 KiB — 347 ms — h2https://assets.habr.com/habr-web/release_2.313.1/js/app.5bdd563f.jsassets.habr.com/habr-web/release_2.... https://assets.habr.com/habr-web/release_2.313.1/js/app.5bdd563f.js — 200 — 292.6 KiB — 521 ms — h2https://assets.habr.com/habr-web/release_2.313.1/css/page-my-feed.1d46d7e2.cssassets.habr.com/habr-web/release_2.... https://assets.habr.com/habr-web/release_2.313.1/css/page-my-feed.1d46d7e2.css — 200 — 1.5 KiB — 235 ms — h2https://assets.habr.com/habr-web/release_2.313.1/js/page-my-feed.f6335af5.jsassets.habr.com/habr-web/release_2.... https://assets.habr.com/habr-web/release_2.313.1/js/page-my-feed.f6335af5.js — 200 — 5.0 KiB — 351 ms — h2https://habr.com/img/promo-banner.webp/img/promo-banner.webp https://habr.com/img/promo-banner.webp — 200 — 411 B — 105 ms — h2https://habrastorage.org/getpro/habr/upload_files/e3e/60a/4cb/e3e60a4cbf8cba11323ecaefddbad727.pnghabrastorage.org/getpro/habr/upload... https://habrastorage.org/getpro/habr/upload_files/e3e/60a/4cb/e3e60a4cbf8cba11323ecaefddbad727.png — 200 — 2.5 MiB — 587 ms — h2https://habr.com/js/i18n/en-compiled.7019baa71f06940a01d790498affc2c8.json/js/i18n/en-compiled.7019baa71f0694... https://habr.com/js/i18n/en-compiled.7019baa71f06940a01d790498affc2c8.json — 200 — 54.3 KiB — 134 ms — h2https://habr.com/manifest.webmanifest/manifest.webmanifest https://habr.com/manifest.webmanifest — 200 — 1.7 KiB — 160 ms — h2https://unpkg.com/pwacompatunpkg.com/pwacompat https://unpkg.com/pwacompat — 302 — 302 B — 122 ms — h3https://yandex.ru/ads/system/context.jsyandex.ru/ads/system/context.js https://yandex.ru/ads/system/context.js — 200 — 105.3 KiB — 474 ms — h2https://cdn.skcrtxr.com/roxot-wrapper/js/roxot-manager.js?pid=c427193e-c45c-4b31-b9de-0d5bc41115fdcdn.skcrtxr.com/roxot-wrapper/js/ro... https://cdn.skcrtxr.com/roxot-wrapper/js/roxot-manager.js?pid=c427193e-c45c-4b31-b9de-0d5bc41115fd — 200 — 5.2 KiB — 293 ms — h2https://assets.habr.com/habr-web/release_2.313.1/img/avatars/086.pngassets.habr.com/habr-web/release_2.... https://assets.habr.com/habr-web/release_2.313.1/img/avatars/086.png — 200 — 9.3 KiB — 202 ms — h2https://assets.habr.com/habr-web/release_2.313.1/img/avatars/143.pngassets.habr.com/habr-web/release_2.... https://assets.habr.com/habr-web/release_2.313.1/img/avatars/143.png — 200 — 4.5 KiB — 204 ms — h2https://habrastorage.org/r/w64/getpro/habr/avatars/756/eda/02e/756eda02e2a2dc42049e834e0ff5e3ec.pnghabrastorage.org/r/w64/getpro/habr/... https://habrastorage.org/r/w64/getpro/habr/avatars/756/eda/02e/756eda02e2a2dc42049e834e0ff5e3ec.png — 200 — 8.1 KiB — 169 ms — h2https://habrastorage.org/r/w64/getpro/habr/avatars/d6f/60e/c68/d6f60ec68a9a4b8fbe43c34afd973a4c.jpghabrastorage.org/r/w64/getpro/habr/... https://habrastorage.org/r/w64/getpro/habr/avatars/d6f/60e/c68/d6f60ec68a9a4b8fbe43c34afd973a4c.jpg — 200 — 2.7 KiB — 169 ms — h2https://habrastorage.org/r/w64/getpro/habr/avatars/850/f1c/026/850f1c026e8139b72b529e7eafd76ac2.jpghabrastorage.org/r/w64/getpro/habr/... https://habrastorage.org/r/w64/getpro/habr/avatars/850/f1c/026/850f1c026e8139b72b529e7eafd76ac2.jpg — 200 — 2.3 KiB — 169 ms — h2https://habrastorage.org/r/w64/getpro/habr/avatars/fd5/e46/96f/fd5e4696ff0815330d4d9ea407e18287.jpghabrastorage.org/r/w64/getpro/habr/... https://habrastorage.org/r/w64/getpro/habr/avatars/fd5/e46/96f/fd5e4696ff0815330d4d9ea407e18287.jpg — 200 — 2.1 KiB — 170 ms — h2https://habrastorage.org/r/w64/getpro/habr/avatars/27a/e3f/da7/27ae3fda77c3828724b6c0568d17ee16.jpghabrastorage.org/r/w64/getpro/habr/... https://habrastorage.org/r/w64/getpro/habr/avatars/27a/e3f/da7/27ae3fda77c3828724b6c0568d17ee16.jpg — 200 — 3.6 KiB — 170 ms — h2https://habrastorage.org/r/w64/getpro/habr/avatars/e83/de8/f9e/e83de8f9ed182d9287ca9900d263c2f9.pnghabrastorage.org/r/w64/getpro/habr/... https://habrastorage.org/r/w64/getpro/habr/avatars/e83/de8/f9e/e83de8f9ed182d9287ca9900d263c2f9.png — 200 — 1.0 KiB — 170 ms — h2https://habrastorage.org/getpro/habr/avatars/fd5/e46/96f/fd5e4696ff0815330d4d9ea407e18287.jpghabrastorage.org/getpro/habr/avatar... https://habrastorage.org/getpro/habr/avatars/fd5/e46/96f/fd5e4696ff0815330d4d9ea407e18287.jpg — 200 — 4.3 KiB — 170 ms — h2https://habrastorage.org/r/w64/getpro/habr/avatars/b17/2fb/11a/b172fb11a63957a6e68e8512932fb851.jpeghabrastorage.org/r/w64/getpro/habr/... https://habrastorage.org/r/w64/getpro/habr/avatars/b17/2fb/11a/b172fb11a63957a6e68e8512932fb851.jpeg — 200 — 2.3 KiB — 170 ms — h2https://habrastorage.org/getpro/habr/avatars/130/274/d34/130274d3415c6b38a647c7f3ee50b57b.gifhabrastorage.org/getpro/habr/avatar... https://habrastorage.org/getpro/habr/avatars/130/274/d34/130274d3415c6b38a647c7f3ee50b57b.gif — 200 — 9.5 KiB — 170 ms — h2https://habrastorage.org/r/w64/getpro/habr/avatars/5d1/542/5cc/5d15425cc9fa46ba586cdd64d18bde50.jpghabrastorage.org/r/w64/getpro/habr/... https://habrastorage.org/r/w64/getpro/habr/avatars/5d1/542/5cc/5d15425cc9fa46ba586cdd64d18bde50.jpg — 200 — 2.7 KiB — 170 ms — h2https://assets.habr.com/habr-web/release_2.313.1/img/avatars/102.pngassets.habr.com/habr-web/release_2.... https://assets.habr.com/habr-web/release_2.313.1/img/avatars/102.png — 200 — 4.8 KiB — 201 ms — h2
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 FCP 1.0 s LCP 5.2 shttps://habr.com// https://habr.com/ — 302 — 643 B — 163 ms — h2https://habr.com/en/feed//en/feed/ https://habr.com/en/feed/ — 200 — 31.5 KiB — 161 ms — h2https://assets.habr.com/habr-web/release_2.313.1/css/theme/light-v2.313.1.cssassets.habr.com/habr-web/release_2.... https://assets.habr.com/habr-web/release_2.313.1/css/theme/light-v2.313.1.css — 200 — 954 B — 240 ms — h2https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900fonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900 — 200 — 1.1 KiB — 108 ms — h2https://rap.skcrtxr.com/pub/pg/e40a4600-273c-4ae8-a7fd-74ad2f469a15/run-rap.jsrap.skcrtxr.com/pub/pg/e40a4600-273... https://rap.skcrtxr.com/pub/pg/e40a4600-273c-4ae8-a7fd-74ad2f469a15/run-rap.js — 200 — 12.1 KiB — 297 ms — 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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
81% of JavaScript execution is third-party
First-party Third-party 1031ms · 514KB · ₽305/mo
assets.habr.com
Other
Costly
Execution 501ms
Transfer 293 KB
Unused 58%
Monthly Cost ₽148/mo
Unattributable
Other
Costly
Execution 335ms
Transfer 0 KB
Monthly Cost ₽99/mo
assets.habr.com
Other
Optional
Execution 126ms
Transfer 214 KB
Unused 53%
Monthly Cost ₽37/mo
rap.skcrtxr.com
Other
Optional
Execution 69ms
Transfer 7 KB
Monthly Cost ₽20/mo

These scripts may cost more than they're worth

  • assets.habr.com adds 501ms and costs ~₽148/month
  • Unattributable adds 335ms and costs ~₽99/month

81% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

assets.habr.com takes 501ms 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

58% of assets.habr.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

Unattributable takes 335ms 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

53% of assets.habr.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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