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https://irena.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
77
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
72
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
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.

1.66 s

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

2.52 s

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

40 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.

2.03 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.

4.69 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 4 REVIEW 4 FIX
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 (2.1 MiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2564ms total JS execution
FIX
2564ms total JS execution
Warning::
https://www.irena.org/?appgw_azwaf_jsc=Yi8j_Bhg1o1...: 2135ms CPU time
Info::
Unattributable: 123ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-7W6Z...: 117ms CPU time
Info::
https://www.irena.org/appgwazwaf/jsc/challenge.32b...: 97ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PR8...: 92ms CPU time
Warning::
Third-party scripts: 2564ms (100% of total)

Main Thread Breakdown

Script Evaluation 79% Other 7% Style & Layout 7% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://www.irena.org/?appgw_azwaf_jsc=Yi8j_Bhg1o1BNEsyghVCzxClQgGyora_ASrwSeesfXhQ28Z0o6ysqexINBhgh36PHWdE6bie3bN5lOLoI3f_a0RBoRpMMylPJIr_0t1rxSp7A7AvNZ4OFLQRHX_mBew20dcOifmVWtEmfS4wMPDw5oC8UszzqV9MfHpXIasIZdIT7BQj3NYWAyokMGzUmYbF_e5D6qBtMc3RDfy1UQR_trSKU_c5P-XXSMFZblKMYrT_tg_Fy9FjQEfQjZcgUs8RNR48TJKm5nWQC02O5er94XgT6t_KsqWUXMyo-cWNn_vwbZvFjEAPwVdX0pV9GjWEFnebEiMl-14F4jV9BUyY7w2135ms1799ms1ms3rd
Unattributable123ms6ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7W6ZEF19K4&cx=c&gtm=4e64k0117ms85ms27ms3rd
https://www.irena.org/appgwazwaf/jsc/challenge.32b5cf3855cc1910a015.js97ms86ms9ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PR8BPS992ms70ms14ms3rd
D
Page Weight Inventory
Action
78 resources · 2.1 MB · 279 KB savings available
FIX
78 resources · 2.1 MB · 279 KB savings available
Warning::
Page weight 1.1 MB over 1MB target
Got: 2.1 MB Expected: ≤ 1 MB
Info::
~279 KB of savings available
Warning::
77 third-party resources (100% of weight)
Info::
2 resources over 200KB
78 resources · 2.1 MiB · 77 third-party 1.1 MiB over 1MB target
JavaScript 56% · 1.1 MiB
Image 20% · 412.6 KiB
Font 9% · 181.0 KiB
Document 8% · 168.4 KiB
CSS 8% · 166.8 KiB
Other 0% · 1.6 KiB

~279.0 KiB of savings available

Remove unused JavaScript: 279.0 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.

C
Page Weight Budget
Action
2.1 MB transferred, 78 requests
REVIEW
2.1 MB transferred, 78 requests
Info::
Page weighs 8.7 MB (2.1 MB transferred)
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::
78 HTTP requests
Info::
Estimated 0.43 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
78 requests
0.43 g CO2 per page load
JavaScript 1.1 MiB 56%
Images 400.4 KiB 19%
Fonts 181.0 KiB 9%
CSS 166.8 KiB 8%
HTML 150.1 KiB 7%
Other 21.2 KiB 1%
Other 9.3 KiB 0%
Other 1.1 KiB 0%
Other 451 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://www.irena.org/-/media/Examples/Irena/Image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irena.org/-/media/Images/IRENA/Agency/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irena.org/-/media/Images/IRENA/Agency/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irena.org/-/media/Images/IRENA/Agency/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irena.org/-/media/Images/IRENA/Agency/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irena.org/-/media/Images/IRENA/Agency/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irena.org/-/media/Images/IRENA/Agency/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irena.org/-/media/Irena/Modules-Conten... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irena.org/-/media/Images/IRENA/Agency/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 400 KB
0 oversized -0 KB
5 legacy format
10 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

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

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

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

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

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

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

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

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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 Bundles
Action
28 scripts, 279 KB unused
REVIEW
28 scripts, 279 KB unused
Warning::
https://form-assets.mailchimp.com/snippet/account/...: 78 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PR8...: 64 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7W6Z...: 63 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.irena.org/appgwazwaf/jsc/challenge.32b...: 45 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.irena.org/assets/js/app.js?v=81387877: 29 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 279 KB
279 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://form-assets.mailchimp.com/snippet/account/95698597?site=17b1ef59262938e5fb148f7a3109 KB78 KB (72%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PR8BPS9136 KB64 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-7W6ZEF19K4&cx=c&gtm=4e64k0154 KB63 KB (41%)✓3rd
https://www.irena.org/appgwazwaf/jsc/challenge.32b5cf3855cc1910a015.js127 KB45 KB (35%)✓3rd
https://www.irena.org/assets/js/app.js?v=8138787748 KB29 KB (61%)✓3rd
https://www.irena.org/assets/js/6200.js?v=e62a792bb3f29da815390 KB—✓3rd
https://www.irena.org/assets/js/3585.js?v=2d06148538ac233e20390 KB—✓3rd
https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js436 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=root,base0 KB—✓3rd
https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js0 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

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
6 fonts (181 KB)
PASS
6 fonts (181 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

181 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.7 s LCP 2.5 shttps://www.irena.org/assets/fonts/Graphik/Graphik-Light.woff2Graphik-Light.woff2 https://www.irena.org/assets/fonts/Graphik/Graphik-Light.woff2 — 36.8 KiB — 148 ms — font-display: swaphttps://www.irena.org/assets/fonts/Graphik/Graphik-Semibold.woff2Graphik-Semibold.woff2 https://www.irena.org/assets/fonts/Graphik/Graphik-Semibold.woff2 — 37.7 KiB — 283 ms — font-display: swaphttps://www.irena.org/assets/fonts/Graphik/Graphik-Bold.woff2Graphik-Bold.woff2 https://www.irena.org/assets/fonts/Graphik/Graphik-Bold.woff2 — 37.6 KiB — 580 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 89 ms — font-display: swaphttps://www.irena.org/assets/fonts/Graphik/Graphik-Regular.woff2Graphik-Regular.woff2 https://www.irena.org/assets/fonts/Graphik/Graphik-Regular.woff2 — 35.1 KiB — 308 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 45 ms — font-display: swap
Graphik-Light.woff2 woff2 swap
Size 37 KB
Load time 148 ms
Start 4.2 s
Risk FOUT — text flashes from fallback to web font
Graphik-Semibold.woff2 woff2 swap
Size 38 KB
Load time 283 ms
Start 4.2 s
Risk FOUT — text flashes from fallback to web font
Graphik-Bold.woff2 woff2 swap
Size 38 KB
Load time 580 ms
Start 4.2 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 89 ms
Start 4.7 s
Risk FOUT — text flashes from fallback to web font
Graphik-Regular.woff2 woff2 swap
Size 35 KB
Load time 308 ms
Start 4.7 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 45 ms
Start 4.8 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
78 requests over 5136ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.7 s LCP 2.5 shttps://irena.org// https://irena.org/ — 301 — 165 B — 253 ms — h2https://www.irena.org/www.irena.org/ https://www.irena.org/ — 403 — 8.9 KiB — 405 ms — http/1.1https://www.irena.org/appgwazwaf/jsc/tp/index.gif?azureRef=a0f6158a3ca665c27b39d8b77fd348ffwww.irena.org/appgwazwaf/jsc/tp/ind... https://www.irena.org/appgwazwaf/jsc/tp/index.gif?azureRef=a0f6158a3ca665c27b39d8b77fd348ff — 200 — 221 B — 398 ms — http/1.1https://www.irena.org/appgwazwaf/jsc/challenge.32b5cf3855cc1910a015.jswww.irena.org/appgwazwaf/jsc/challe... https://www.irena.org/appgwazwaf/jsc/challenge.32b5cf3855cc1910a015.js — 200 — 126.6 KiB — 810 ms — http/1.1https://www.irena.org/appgwazwaf/jsc/tp/bundle.gif?azureRef=a0f6158a3ca665c27b39d8b77fd348ffwww.irena.org/appgwazwaf/jsc/tp/bun... https://www.irena.org/appgwazwaf/jsc/tp/bundle.gif?azureRef=a0f6158a3ca665c27b39d8b77fd348ff — 200 — 221 B — 138 ms — http/1.1https://www.irena.org/favicon.icowww.irena.org/favicon.ico https://www.irena.org/favicon.ico — 403 — 8.8 KiB — 138 ms — http/1.1https://www.irena.org/?appgw_azwaf_jsc=Yi8j_Bhg1o1BNEsyghVCzxClQgGyora_ASrwSeesfXhQ28Z0o6ysqexINBhgh36PHWdE6bie3bN5lOLoI3f_a0RBoRpMMylPJIr_0t1rxSp7A7AvNZ4OFLQRHX_mBew20dcOifmVWtEmfS4wMPDw5oC8UszzqV9MfHpXIasIZdIT7BQj3NYWAyokMGzUmYbF_e5D6qBtMc3RDfy1UQR_trSKU_c5P-XXSMFZblKMYrT_tg_Fy9FjQEfQjZcgUs8RNR48TJKm5nWQC02O5er94XgT6t_KsqWUXMyo-cWNn_vwbZvFjEAPwVdX0pV9GjWEFnebEiMl-14F4jV9BUyY7wwww.irena.org/?appgw_azwaf_jsc=Yi8j... https://www.irena.org/?appgw_azwaf_jsc=Yi8j_Bhg1o1BNEsyghVCzxClQgGyora_ASrwSeesfXhQ28Z0o6ysqexINBhgh36PHWdE6bie3bN5lOLoI3f_a0RBoRpMMylPJIr_0t1rxSp7A7AvNZ4OFLQRHX_mBew20dcOifmVWtEmfS4wMPDw5oC8UszzqV9MfHpXIasIZdIT7BQj3NYWAyokMGzUmYbF_e5D6qBtMc3RDfy1UQR_trSKU_c5P-XXSMFZblKMYrT_tg_Fy9FjQEfQjZcgUs8RNR48TJKm5nWQC02O5er94XgT6t_KsqWUXMyo-cWNn_vwbZvFjEAPwVdX0pV9GjWEFnebEiMl-14F4jV9BUyY7w — 200 — 31.1 KiB — 397 ms — http/1.1https://www.irena.org/assets/fonts/Graphik/Graphik-Light.woff2www.irena.org/assets/fonts/Graphik/... https://www.irena.org/assets/fonts/Graphik/Graphik-Light.woff2 — 200 — 36.8 KiB — 148 ms — http/1.1https://www.irena.org/assets/fonts/Graphik/Graphik-Semibold.woff2www.irena.org/assets/fonts/Graphik/... https://www.irena.org/assets/fonts/Graphik/Graphik-Semibold.woff2 — 200 — 37.7 KiB — 283 ms — http/1.1https://www.irena.org/assets/fonts/Graphik/Graphik-Bold.woff2www.irena.org/assets/fonts/Graphik/... https://www.irena.org/assets/fonts/Graphik/Graphik-Bold.woff2 — 200 — 37.6 KiB — 580 ms — http/1.1https://www.irena.org/assets/styles/default.css?v=81387877www.irena.org/assets/styles/default... https://www.irena.org/assets/styles/default.css?v=81387877 — 200 — 60.3 KiB — 296 ms — http/1.1https://www.irena.org/-/media/Examples/Irena/Images/Navigation/IRENA_logo.svg?la=en&hash=C68751AAB97C5A6B6714D109A3BAC560www.irena.org/-/media/Examples/Iren... https://www.irena.org/-/media/Examples/Irena/Images/Navigation/IRENA_logo.svg?la=en&hash=C68751AAB97C5A6B6714D109A3BAC560 — 200 — 208.0 KiB — 588 ms — http/1.1https://www.irena.org/assets/js/app.js?v=81387877www.irena.org/assets/js/app.js?v=81... https://www.irena.org/assets/js/app.js?v=81387877 — 200 — 48.5 KiB — 700 ms — http/1.1https://www.clarity.ms/tag/ufn5mhzzntwww.clarity.ms/tag/ufn5mhzznt https://www.clarity.ms/tag/ufn5mhzznt — -1 — 0 B — 0 ms — https://www.irena.org/assets/static/site.webmanifestwww.irena.org/assets/static/site.we... https://www.irena.org/assets/static/site.webmanifest — 403 — 9.3 KiB — 443 ms — http/1.1https://chimpstatic.com/mcjs-connected/js/users/58854272bde93aba940164cee/17b1ef59262938e5fb148f7a3.jschimpstatic.com/mcjs-connected/js/u... https://chimpstatic.com/mcjs-connected/js/users/58854272bde93aba940164cee/17b1ef59262938e5fb148f7a3.js — 200 — 1.5 KiB — 52 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
100% of JavaScript execution is third-party
First-party Third-party 2564ms · 448KB · $34/mo
www.irena.org
Other
Costly
Execution 2135ms
Transfer 31 KB
Monthly Cost $28/mo
Unattributable
Other
Optional
Execution 123ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 117ms
Transfer 154 KB
Unused 41%
Monthly Cost $2/mo
www.irena.org
Other
Optional
Execution 97ms
Transfer 127 KB
Unused 35%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 92ms
Transfer 136 KB
Unused 48%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.irena.org adds 2135ms and costs ~$28/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.irena.org takes 2135ms 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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