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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

87
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.
96
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.

1.01 s

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

2.14 s

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

18 ms

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

0.008

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

1.43 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.

3.26 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
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
4.3 MB transferred, 104 requests
FIX
4.3 MB transferred, 104 requests
Critical::
Page weighs 8.9 MB (4.3 MB transferred)
Warning::
Images are 2.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.7 MB
Warning::
JavaScript is 941 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 941 KB
Info::
Fonts are 466 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 466 KB
Warning::
104 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.89 g CO2 per page load
4.3 MB / 2.4 MB budget
4.3 MB transferred
104 requests
0.89 g CO2 per page load
Images 2.7 MiB 63%
JavaScript 941.0 KiB 22%
Fonts 466.0 KiB 11%
CSS 169.5 KiB 4%
HTML 32.1 KiB 1%
Other 9.6 KiB 0%
Other 3.4 KiB 0%
Other 3.3 KiB 0%
Other 628 B 0%
Other 597 B 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

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (4.3 MiB of 4.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
22 scripts, 377 KB unused
FIX
22 scripts, 377 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-29R5...: 69 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-9N7L...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TWR...: 61 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://analytics.tiktok.com/i18n/pixel/static/mai...: 55 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.google.com/cse/static/element/b33cba58...: 49 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 377 KB
377 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-29R534B4TL&cx=c&gtm=4e64h1169 KB69 KB (41%)3rd
https://www.googletagmanager.com/gtag/js?id=G-9N7LL0B0D9&cx=c&gtm=4e64h1156 KB66 KB (42%)3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWRVN2N137 KB61 KB (45%)3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js110 KB55 KB (50%)3rd
https://www.google.com/cse/static/element/b33cba5881f68fbf/cse_element__en.js?usqp=CAI%3D98 KB49 KB (50%)3rd
https://www.uoregon.edu/sites/default/files/js/js_g-DXtA6CDA9vDv6hVwyAQC_r4YFchNtyISBeGPj1XLg.js?scope=footer&delta=0&language=en&theme=uo_gateway&include=eJyFj2sKwzAMgy8UL0cKTuqadE5c8qDt7RdGt9HB2B9bEh8CBRUtXncbTmFewk6a1l7ifHyimGMzrMpCriFbHufb33DB_Rom07xLxJgod-uxkunqghayNRQVgRYTScwEq8oxR5E30BU28jBRjZxhLqNj03KHS8svKIwJQu0_-Bw2IMZGGx72_LDUB4NFb6E66 KB45 KB (69%)3rd
https://cse.google.com/adsense/search/async-ads.js44 KB32 KB (73%)3rd
https://www.uoregon.edu/sites/default/files/js/js_eZTqQKi949bKPIGZTlZV-7jcUVq7vqg06IIVes3wtCs.js?scope=header&delta=5&language=en&theme=uo_gateway&include=eJyFj2sKwzAMgy8UL0cKTuqadE5c8qDt7RdGt9HB2B9bEh8CBRUtXncbTmFewk6a1l7ifHyimGMzrMpCriFbHufb33DB_Rom07xLxJgod-uxkunqghayNRQVgRYTScwEq8oxR5E30BU28jBRjZxhLqNj03KHS8svKIwJQu0_-Bw2IMZGGx72_LDUB4NFb6E6 KB3rd
https://cdn.bc0a.com/autopilot/f00000000313636/autopilot_sdk.js24 KB3rd
https://cse.google.com/cse.js?cx=005933198350176372664:riyhycsgqf44 KB3rd

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

D
Page Weight Inventory
Action
104 resources · 4.3 MB · 377 KB savings available
FIX
104 resources · 4.3 MB · 377 KB savings available
Warning::
Page weight 3.3 MB over 1MB target
Got: 4.3 MB Expected: ≤ 1 MB
Info::
~377 KB of savings available
Warning::
103 third-party resources (100% of weight)
Info::
4 resources over 200KB
104 resources · 4.3 MiB · 103 third-party 3.3 MiB over 1MB target
Image 63% · 2.7 MiB
JavaScript 22% · 941.0 KiB
Font 11% · 466.0 KiB
CSS 4% · 169.5 KiB
Document 1% · 32.1 KiB
Other 0% · 14.3 KiB

~376.7 KiB of savings available

Remove unused JavaScript: 376.7 KiB
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
Image Optimization
51 images, 0 KB saveable
REVIEW
51 images, 0 KB saveable
Warning::
https://www.uoregon.edu/sites/default/files/2020-0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
51 images 2.7 MB
0 oversized -0 KB
24 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
1229ms total JS execution
REVIEW
1229ms total JS execution
Warning::
https://www.uoregon.edu/: 584ms CPU time
Info::
Unattributable: 188ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TWR...: 120ms CPU time
Info::
https://scripts.clarity.ms/0.8.59/clarity.js: 100ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-29R5...: 68ms CPU time
Warning::
Third-party scripts: 1229ms (100% of total)

Main Thread Breakdown

Other 34% Script Evaluation 33% Style & Layout 16% Rendering 6% Script Parsing & Compilation 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.uoregon.edu/584ms2ms1ms3rd
Unattributable188ms3ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWRVN2N120ms101ms10ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js100ms87ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-29R534B4TL&cx=c&gtm=4e64h168ms52ms14ms3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js62ms52ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-9N7LL0B0D9&cx=c&gtm=4e64h156ms46ms10ms3rd
https://www.uoregon.edu/sites/default/files/js/js_eZTqQKi949bKPIGZTlZV-7jcUVq7vqg06IIVes3wtCs.js?scope=header&delta=5&language=en&theme=uo_gateway&include=eJyFj2sKwzAMgy8UL0cKTuqadE5c8qDt7RdGt9HB2B9bEh8CBRUtXncbTmFewk6a1l7ifHyimGMzrMpCriFbHufb33DB_Rom07xLxJgod-uxkunqghayNRQVgRYTScwEq8oxR5E30BU28jBRjZxhLqNj03KHS8svKIwJQu0_-Bw2IMZGGx72_LDUB4NFb6E51ms12ms0ms3rd
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
5 fonts (466 KB)
PASS
5 fonts (466 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

466 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.0 s LCP 2.1 shttps://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Universal/stable-assets/fonts/SourceSansVariable-Roman.ttf.woff2SourceSansVariable-Roma... https://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Universal/stable-assets/fonts/SourceSansVariable-Roman.ttf.woff2 — 135.0 KiB — 146 ms — font-display: swaphttps://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Universal/stable-assets/fonts/United/UnitedSerifRgMd.woff2UnitedSerifRgMd.woff2 https://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Universal/stable-assets/fonts/United/UnitedSerifRgMd.woff2 — 58.6 KiB — 131 ms — font-display: swaphttps://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Universal/stable-assets/fonts/United/UnitedSansSmCdBd.woff2UnitedSansSmCdBd.woff2 https://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Universal/stable-assets/fonts/United/UnitedSansSmCdBd.woff2 — 45.7 KiB — 119 ms — font-display: swaphttps://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Universal/stable-assets/fontawesome-free-6.5.1-web/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Universal/stable-assets/fontawesome-free-6.5.1-web/webfonts/fa-brands-400.woff2 — 115.2 KiB — 45 ms — font-display: swaphttps://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Universal/stable-assets/fonts/SourceSansVariable-Italic.ttf.woff2SourceSansVariable-Ital... https://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Universal/stable-assets/fonts/SourceSansVariable-Italic.ttf.woff2 — 111.5 KiB — 43 ms — font-display: swap
SourceSansVariable-Roma... woff2 swap
Size 135 KB
Load time 146 ms
Start 456 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
UnitedSerifRgMd.woff2 woff2 swap
Size 59 KB
Load time 131 ms
Start 456 ms
Risk FOUT — text flashes from fallback to web font
UnitedSansSmCdBd.woff2 woff2 swap
Size 46 KB
Load time 119 ms
Start 456 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 115 KB
Load time 45 ms
Start 566 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
SourceSansVariable-Ital... woff2 swap
Size 111 KB
Load time 43 ms
Start 574 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
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 ~181 KB and ~362 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
Network Waterfall
104 requests over 3811ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.0 s LCP 2.1 shttps://uoregon.edu// https://uoregon.edu/ — 301 — 232 B — 15 ms — h2https://www.uoregon.edu/www.uoregon.edu/ https://www.uoregon.edu/ — 200 — 26.3 KiB — 7 ms — h2https://www.uoregon.edu/sites/default/files/css/css_ag6QA54KZb7Gvu6aAs4e8gM7WaRP1MknXyHTCy0JHzg.css?delta=0&language=en&theme=uo_gateway&include=eJyFkEGOwyAMRS-UhEUPFBn4SZkARjZM0jl9mUbtVJpFd_7Plp9lt8GHyjKH7JGrjew281YPjiOL5cPgoFQiLp0IjJdWKE70RccJMkuiGH7Qo6bgjCV91QmqtEKfObPHkLqZzBJihUyOSg2ch0JCq1C56lPxR6aWS7Mx6BV-0JtWpNNS7ZywUkJu_4HWW-zmxvPjzvOCmb8hEvxbY-FcR9qhnPCCjccdduxzYc3jIn3lzrKND8unIce_D6u4Az_4idEwww.uoregon.edu/sites/default/files... https://www.uoregon.edu/sites/default/files/css/css_ag6QA54KZb7Gvu6aAs4e8gM7WaRP1MknXyHTCy0JHzg.css?delta=0&language=en&theme=uo_gateway&include=eJyFkEGOwyAMRS-UhEUPFBn4SZkARjZM0jl9mUbtVJpFd_7Plp9lt8GHyjKH7JGrjew281YPjiOL5cPgoFQiLp0IjJdWKE70RccJMkuiGH7Qo6bgjCV91QmqtEKfObPHkLqZzBJihUyOSg2ch0JCq1C56lPxR6aWS7Mx6BV-0JtWpNNS7ZywUkJu_4HWW-zmxvPjzvOCmb8hEvxbY-FcR9qhnPCCjccdduxzYc3jIn3lzrKND8unIce_D6u4Az_4idE — 200 — 1.1 KiB — 28 ms — h2https://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Releases/25.11/v1/css/uoweb-universal-components.csscdn.uoregon.edu/uocdn1/uo-web-desig... https://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Releases/25.11/v1/css/uoweb-universal-components.css — 200 — 43.0 KiB — 326 ms — h2https://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Releases/25.11/v1/css/styles-drupal8.csscdn.uoregon.edu/uocdn1/uo-web-desig... https://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Releases/25.11/v1/css/styles-drupal8.css — 200 — 70.3 KiB — 314 ms — h2https://www.uoregon.edu/sites/default/files/css/css_aA_gStrdPiWvGKZw4sCkQc0aKL-BEKKK2svddl4SGz8.css?delta=3&language=en&theme=uo_gateway&include=eJyFkEGOwyAMRS-UhEUPFBn4SZkARjZM0jl9mUbtVJpFd_7Plp9lt8GHyjKH7JGrjew281YPjiOL5cPgoFQiLp0IjJdWKE70RccJMkuiGH7Qo6bgjCV91QmqtEKfObPHkLqZzBJihUyOSg2ch0JCq1C56lPxR6aWS7Mx6BV-0JtWpNNS7ZywUkJu_4HWW-zmxvPjzvOCmb8hEvxbY-FcR9qhnPCCjccdduxzYc3jIn3lzrKND8unIce_D6u4Az_4idEwww.uoregon.edu/sites/default/files... https://www.uoregon.edu/sites/default/files/css/css_aA_gStrdPiWvGKZw4sCkQc0aKL-BEKKK2svddl4SGz8.css?delta=3&language=en&theme=uo_gateway&include=eJyFkEGOwyAMRS-UhEUPFBn4SZkARjZM0jl9mUbtVJpFd_7Plp9lt8GHyjKH7JGrjew281YPjiOL5cPgoFQiLp0IjJdWKE70RccJMkuiGH7Qo6bgjCV91QmqtEKfObPHkLqZzBJihUyOSg2ch0JCq1C56lPxR6aWS7Mx6BV-0JtWpNNS7ZywUkJu_4HWW-zmxvPjzvOCmb8hEvxbY-FcR9qhnPCCjccdduxzYc3jIn3lzrKND8unIce_D6u4Az_4idE — 200 — 18.9 KiB — 28 ms — h2https://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Universal/stable-assets/fontawesome-free-6.5.1-web/css/all.min.csscdn.uoregon.edu/uocdn1/uo-web-desig... https://cdn.uoregon.edu/uocdn1/uo-web-design-framework/Universal/stable-assets/fontawesome-free-6.5.1-web/css/all.min.css — 200 — 21.7 KiB — 328 ms — h2https://www.uoregon.edu/sites/default/files/css/css_gw7LYO4NYGaQBTVmsHxm9dLpV6VemQtgrX_VhW6pjKs.css?delta=5&language=en&theme=uo_gateway&include=eJyFkEGOwyAMRS-UhEUPFBn4SZkARjZM0jl9mUbtVJpFd_7Plp9lt8GHyjKH7JGrjew281YPjiOL5cPgoFQiLp0IjJdWKE70RccJMkuiGH7Qo6bgjCV91QmqtEKfObPHkLqZzBJihUyOSg2ch0JCq1C56lPxR6aWS7Mx6BV-0JtWpNNS7ZywUkJu_4HWW-zmxvPjzvOCmb8hEvxbY-FcR9qhnPCCjccdduxzYc3jIn3lzrKND8unIce_D6u4Az_4idEwww.uoregon.edu/sites/default/files... 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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
100% of JavaScript execution is third-party
First-party Third-party 1229ms · 630KB · €13/mo
www.uoregon.edu
Other
Costly
Execution 584ms
Transfer 26 KB
Monthly Cost €6/mo
Unattributable
Other
Optional
Execution 188ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 120ms
Transfer 137 KB
Unused 45%
Monthly Cost €1/mo
Microsoft Clarity
Session Replay
Optional
Execution 100ms
Transfer 26 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 169 KB
Unused 41%
Monthly Cost €1/mo
analytics.tiktok.com
Other
Optional
Execution 62ms
Transfer 110 KB
Unused 50%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 56ms
Transfer 156 KB
Unused 42%
Monthly Cost €1/mo
www.uoregon.edu
Other
Optional
Execution 51ms
Transfer 6 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.uoregon.edu adds 584ms and costs ~€6/month

100% 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

www.uoregon.edu takes 584ms 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

50% of analytics.tiktok.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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