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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
48
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.
81
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.

1.01 s

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

2.68 s

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

282 ms

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

0.754

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

1.33 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.

2.68 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
6 PASS 4 REVIEW 3 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 99 requests
FIX
2.2 MB transferred, 99 requests
Info::
Page weighs 4.6 MB (2.2 MB transferred)
Warning::
Images are 1.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.4 MB
Warning::
JavaScript is 624 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 624 KB
Info::
99 HTTP requests
Info::
Estimated 0.45 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
99 requests
0.45 g CO2 per page load
Images 1.4 MiB 63%
JavaScript 623.7 KiB 28%
HTML 61.4 KiB 3%
CSS 50.2 KiB 2%
Other 36.9 KiB 2%
Fonts 32.3 KiB 1%
Other 9.0 KiB 0%
Other 3.5 KiB 0%
Other 988 B 0%
Other 145 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
99 resources · 2.2 MB · 223 KB savings available
FIX
99 resources · 2.2 MB · 223 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~223 KB of savings available
Warning::
98 third-party resources (100% of weight)
Info::
3 resources over 200KB
99 resources · 2.2 MiB · 98 third-party 1.2 MiB over 1MB target
Image 63% · 1.4 MiB
JavaScript 28% · 623.7 KiB
Document 3% · 61.8 KiB
CSS 2% · 54.5 KiB
Other 2% · 37.1 KiB
Font 1% · 32.3 KiB

~223.3 KiB of savings available

Remove unused JavaScript: 223.3 KiB
C
Image Optimization
Action
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Warning::
https://itp.cdn.icann.org/en/files/homepage/learn-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/newcom... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/report... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/flyer-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/icann-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/career... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/subscr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/social... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/meetin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/assets/images/www-static... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/assets/images/www-static... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/tripti... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/kurtis... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://itp.cdn.icann.org/en/files/homepage/engage... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
25 images 1.4 MB
0 oversized -0 KB
22 legacy format
14 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

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

C
JS Execution Cost
Action
1102ms total JS execution
REVIEW
1102ms total JS execution
Warning::
https://www.icann.org/chunk-ROIY53Y6.js: 328ms CPU time
Warning::
https://www.icann.org/: 320ms CPU time
Warning::
Unattributable: 304ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202411.1...: 79ms CPU time
Info::
https://www.icann.org/cdn-cgi/challenge-platform/s...: 71ms CPU time
Warning::
Third-party scripts: 1102ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Other 22% Style & Layout 15% Parse HTML & CSS 9% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://www.icann.org/chunk-ROIY53Y6.js328ms246ms1ms3rd
https://www.icann.org/320ms13ms1ms3rd
Unattributable304ms118ms0ms3rd
https://cdn.cookielaw.org/scripttemplates/202411.1.0/otBannerSdk.js79ms48ms13ms3rd
https://www.icann.org/cdn-cgi/challenge-platform/scripts/jsd/main.js71ms68ms1ms3rd
C
JS Bundles
Action
54 scripts, 223 KB unused
REVIEW
54 scripts, 223 KB unused
Warning::
https://www.icann.org/chunk-ROIY53Y6.js: 137 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202411.1...: 61 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.matomo.cloud/icann.matomo.cloud/contai...: 25 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 223 KB
223 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.icann.org/chunk-ROIY53Y6.js282 KB137 KB (49%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202411.1.0/otBannerSdk.js112 KB61 KB (54%)✓3rd
https://cdn.matomo.cloud/icann.matomo.cloud/container_dcxlZGo2.js52 KB25 KB (49%)✓3rd
https://cdn.cookielaw.org/consent/0191ec5b-f444-7ae1-affc-c6b451de20e4/OtAutoBlock.js2 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js9 KB—✓3rd
https://www.icann.org/chunk-B4IAYUVL.js0 KB—✓3rd
https://www.icann.org/chunk-WTEITCJQ.js0 KB—✓3rd
https://www.icann.org/chunk-5BBDXEKN.js0 KB—✓3rd
https://www.icann.org/chunk-6YKCXSIJ.js0 KB—✓3rd
https://www.icann.org/chunk-MT3ET2IZ.js8 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

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
3 fonts (32 KB)
PASS
3 fonts (32 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

32 KB total

Render-blocking

0

of 3

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 2.5 s FCP 1.0 s LCP 2.7 shttps://itp.cdn.icann.org/assets/fonts/notosans/o-0IIpQlx3QUlC5A4PNr5TRASf6M7Q.woff2o-0IIpQlx3QUlC5A4PNr5TR... https://itp.cdn.icann.org/assets/fonts/notosans/o-0IIpQlx3QUlC5A4PNr5TRASf6M7Q.woff2 — 13.0 KiB — 62 ms — font-display: swaphttps://itp.cdn.icann.org/assets/fonts/notosans/o-0NIpQlx3QUlC5A4PNjXhFVZNyBx2pqPA.woff2o-0NIpQlx3QUlC5A4PNjXhF... https://itp.cdn.icann.org/assets/fonts/notosans/o-0NIpQlx3QUlC5A4PNjXhFVZNyBx2pqPA.woff2 — 12.9 KiB — 64 ms — font-display: swaphttps://itp.cdn.icann.org/assets/fonts/notosans/o-0IIpQlx3QUlC5A4PNr4TRASf6M7VBj.woff2o-0IIpQlx3QUlC5A4PNr4TR... https://itp.cdn.icann.org/assets/fonts/notosans/o-0IIpQlx3QUlC5A4PNr4TRASf6M7VBj.woff2 — 6.4 KiB — 55 ms — font-display: swap
o-0IIpQlx3QUlC5A4PNr5TR... woff2 swap
Size 13 KB
Load time 62 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
o-0NIpQlx3QUlC5A4PNjXhF... woff2 swap
Size 13 KB
Load time 64 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
o-0IIpQlx3QUlC5A4PNr4TR... woff2 swap
Size 6 KB
Load time 55 ms
Start 1.0 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
A
HTTP Caching
max-age=345600 (4 days)
PASS
max-age=345600 (4 days)
Info::
Cache-Control header is set
Got: max-age=345600
Info::
Effective TTL: 4 days (max-age=345600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=345600

DirectiveValueMeaning
max-age345600Cache for 4 days
Effective TTL: 345600 seconds
Network Waterfall
99 requests over 2302ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.0 s LCP 2.7 shttps://icann.org// https://icann.org/ — 301 — 368 B — 292 ms — http/1.1https://www.icann.org/www.icann.org/ https://www.icann.org/ — 200 — 61.4 KiB — 661 ms — h2https://cdn.cookielaw.org/consent/0191ec5b-f444-7ae1-affc-c6b451de20e4/OtAutoBlock.jscdn.cookielaw.org/consent/0191ec5b-... https://cdn.cookielaw.org/consent/0191ec5b-f444-7ae1-affc-c6b451de20e4/OtAutoBlock.js — 200 — 2.3 KiB — 79 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 76 ms — h2https://www.icann.org/manifest.jsonwww.icann.org/manifest.json https://www.icann.org/manifest.json — 200 — 988 B — 490 ms — h2https://cdn.cookielaw.org/consent/0191ec5b-f444-7ae1-affc-c6b451de20e4/0191ec5b-f444-7ae1-affc-c6b451de20e4.jsoncdn.cookielaw.org/consent/0191ec5b-... https://cdn.cookielaw.org/consent/0191ec5b-f444-7ae1-affc-c6b451de20e4/0191ec5b-f444-7ae1-affc-c6b451de20e4.json — 200 — 2.2 KiB — 81 ms — h2https://www.icann.org/styles-C4NBEBFQ.csswww.icann.org/styles-C4NBEBFQ.css https://www.icann.org/styles-C4NBEBFQ.css — 200 — 50.2 KiB — 29 ms — h2https://itp.cdn.icann.org/en/files/government-engagement-ge/blue-tab-icon-homepage80x80government-engagement-publications-en.svgitp.cdn.icann.org/en/files/governme... https://itp.cdn.icann.org/en/files/government-engagement-ge/blue-tab-icon-homepage80x80government-engagement-publications-en.svg — 200 — 1.0 KiB — 77 ms — h2https://itp.cdn.icann.org/en/files/office-of-the-chief-technology-officer-octo-reports/blue-tab-icon-homepage80x80octo-publications-en.svgitp.cdn.icann.org/en/files/office-o... https://itp.cdn.icann.org/en/files/office-of-the-chief-technology-officer-octo-reports/blue-tab-icon-homepage80x80octo-publications-en.svg — 200 — 1.3 KiB — 76 ms — h2https://itp.cdn.icann.org/en/files/homepage/acronyms-and-terms-17-02-2023-en.svgitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/acronyms-and-terms-17-02-2023-en.svg — 200 — 1.3 KiB — 71 ms — h2https://itp.cdn.icann.org/en/files/homepage/domain-name-holder-16-02-2023-en.svgitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/domain-name-holder-16-02-2023-en.svg — 200 — 1.6 KiB — 75 ms — h2https://itp.cdn.icann.org/en/files/homepage/icann85-icannorg-closing-webbanner-01-17-03-2026-en-large.jpgitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/icann85-icannorg-closing-webbanner-01-17-03-2026-en-large.jpg — 200 — 249.4 KiB — 424 ms — h2https://www.icann.org/src/assets/images/icons/sprites_v8.svg?v=20231127www.icann.org/src/assets/images/ico... https://www.icann.org/src/assets/images/icons/sprites_v8.svg?v=20231127 — 200 — 20.7 KiB — 30 ms — h2https://itp.cdn.icann.org/assets/images/www-static/logo/icann_logo.webpitp.cdn.icann.org/assets/images/www... https://itp.cdn.icann.org/assets/images/www-static/logo/icann_logo.webp — 200 — 13.2 KiB — 59 ms — h2https://itp.cdn.icann.org/assets/images/www-static/logo/icann-logo-tagline-en_680x152.webpitp.cdn.icann.org/assets/images/www... https://itp.cdn.icann.org/assets/images/www-static/logo/icann-logo-tagline-en_680x152.webp — 200 — 8.1 KiB — 58 ms — h2https://itp.cdn.icann.org/en/files/homepage/flyer-image-536x302-17-04-2026-en-large.pngitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/flyer-image-536x302-17-04-2026-en-large.png — 200 — 750.0 KiB — 352 ms — h2https://itp.cdn.icann.org/en/files/homepage/icann-logo-on-blue-536x302-copy-07-04-2026-en-large.jpgitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/icann-logo-on-blue-536x302-copy-07-04-2026-en-large.jpg — 200 — 44.3 KiB — 384 ms — h2https://itp.cdn.icann.org/en/files/homepage/tripti-sinha-homepage-feature-graphic-536x302-30-03-2026-en-large.pngitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/tripti-sinha-homepage-feature-graphic-536x302-30-03-2026-en-large.png — 200 — 140.1 KiB — 379 ms — h2https://itp.cdn.icann.org/en/files/homepage/kurtis-lindqvist-homepage-feature-graphic-536x302-26-03-2026-en-large.pngitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/kurtis-lindqvist-homepage-feature-graphic-536x302-26-03-2026-en-large.png — 200 — 126.8 KiB — 371 ms — h2https://itp.cdn.icann.org/en/files/homepage/report-to-the-board-29-03-2023-en-large.pngitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/report-to-the-board-29-03-2023-en-large.png — 200 — 2.1 KiB — 362 ms — h2https://itp.cdn.icann.org/en/files/homepage/careers-29-03-2023-en-large.pngitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/careers-29-03-2023-en-large.png — 200 — 2.3 KiB — 364 ms — h2https://itp.cdn.icann.org/en/files/homepage/learn-29-03-2023-en-large.pngitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/learn-29-03-2023-en-large.png — 200 — 2.5 KiB — 372 ms — h2https://itp.cdn.icann.org/en/files/homepage/newcomers-29-03-2023-en-large.pngitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/newcomers-29-03-2023-en-large.png — 200 — 2.7 KiB — 349 ms — h2https://itp.cdn.icann.org/en/files/homepage/engagement-calendar-29-03-2023-en-large.pngitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/engagement-calendar-29-03-2023-en-large.png — 200 — 1.5 KiB — 359 ms — h2https://itp.cdn.icann.org/en/files/homepage/subscriptions-29-03-2023-en-large.pngitp.cdn.icann.org/en/files/homepage... https://itp.cdn.icann.org/en/files/homepage/subscriptions-29-03-2023-en-large.png — 200 — 1.8 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h2https://www.icann.org/chunk-NPKCKYYD.jswww.icann.org/chunk-NPKCKYYD.js https://www.icann.org/chunk-NPKCKYYD.js — 200 — 472 B — 29 ms — h2https://www.icann.org/chunk-J5VWRZRW.jswww.icann.org/chunk-J5VWRZRW.js https://www.icann.org/chunk-J5VWRZRW.js — 200 — 625 B — 37 ms — h2https://www.icann.org/chunk-5TYVZGAC.jswww.icann.org/chunk-5TYVZGAC.js https://www.icann.org/chunk-5TYVZGAC.js — 200 — 424 B — 35 ms — h2https://www.icann.org/chunk-DDXACLES.jswww.icann.org/chunk-DDXACLES.js https://www.icann.org/chunk-DDXACLES.js — 200 — 586 B — 32 ms — h2https://www.icann.org/chunk-522OGF3N.jswww.icann.org/chunk-522OGF3N.js https://www.icann.org/chunk-522OGF3N.js — 200 — 468 B — 36 ms — h2https://www.icann.org/chunk-6V62PIK5.jswww.icann.org/chunk-6V62PIK5.js https://www.icann.org/chunk-6V62PIK5.js — 200 — 308 B — 40 ms — h2https://www.icann.org/chunk-4PWCXKTU.jswww.icann.org/chunk-4PWCXKTU.js https://www.icann.org/chunk-4PWCXKTU.js — 200 — 384 B — 38 ms — h2https://www.icann.org/chunk-YUREUW6L.jswww.icann.org/chunk-YUREUW6L.js https://www.icann.org/chunk-YUREUW6L.js — 200 — 448 B — 41 ms — h2https://www.icann.org/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.17824379749292918:1776795218:99fuwSfPmBan7RdTol934OJ-xWOsYjlEfIyMecJywMc/9efeba9a6f90d141www.icann.org/cdn-cgi/challenge-pla... https://www.icann.org/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.17824379749292918:1776795218:99fuwSfPmBan7RdTol934OJ-xWOsYjlEfIyMecJywMc/9efeba9a6f90d141 — 200 — 1.2 KiB — 24 ms — h2https://cdn.matomo.cloud/icann.matomo.cloud/container_dcxlZGo2.jscdn.matomo.cloud/icann.matomo.cloud... https://cdn.matomo.cloud/icann.matomo.cloud/container_dcxlZGo2.js — 200 — 51.8 KiB — 89 ms — h2https://icann.matomo.cloud/matomo.php?action_name=Internet%20Corporation%20for%20Assigned%20Names%20and%20Numbers%20(ICANN)&idsite=1&rec=1&r=406624&h=19&m=17&s=28&url=https%3A%2F%2Fwww.icann.org%2F&_id=&_idn=1&send_image=0&_refts=0&dimension1=Not%20Logged%20In&dimension2=en&pv_id=1s18GA&fa_pv=1&fa_fp[0][fa_vid]=SGtowK&fa_fp[0][fa_id]=searchField&fa_fp[0][fa_fv]=1&pf_net=50&pf_srv=471&pf_tfr=140&pf_dm1=334&pf_dm2=387&pf_onl=1&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22147.0.7727.101%22%7D%2C%7B%22brand%22%3A%22Not.A%2FBrand%22%2C%22version%22%3A%228.0.0.0%22%7D%5D%2C%22mobile%22%3Afalse%2C%22model%22%3A%22%22%2C%22platform%22%3A%22macOS%22%2C%22platformVersion%22%3A%2210.15.7%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=800x600icann.matomo.cloud/matomo.php?actio... https://icann.matomo.cloud/matomo.php?action_name=Internet%20Corporation%20for%20Assigned%20Names%20and%20Numbers%20(ICANN)&idsite=1&rec=1&r=406624&h=19&m=17&s=28&url=https%3A%2F%2Fwww.icann.org%2F&_id=&_idn=1&send_image=0&_refts=0&dimension1=Not%20Logged%20In&dimension2=en&pv_id=1s18GA&fa_pv=1&fa_fp[0][fa_vid]=SGtowK&fa_fp[0][fa_id]=searchField&fa_fp[0][fa_fv]=1&pf_net=50&pf_srv=471&pf_tfr=140&pf_dm1=334&pf_dm2=387&pf_onl=1&uadata=%7B%22formFactors%22%3A%5B%22Desktop%22%5D%2C%22fullVersionList%22%3A%5B%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22147.0.7727.101%22%7D%2C%7B%22brand%22%3A%22Not.A%2FBrand%22%2C%22version%22%3A%228.0.0.0%22%7D%5D%2C%22mobile%22%3Afalse%2C%22model%22%3A%22%22%2C%22platform%22%3A%22macOS%22%2C%22platformVersion%22%3A%2210.15.7%22%7D&pdf=1&qt=0&realp=0&wma=0&fla=0&java=0&ag=0&cookie=1&res=800x600 — 204 — 145 B — 203 ms — h2
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 1102ms · 456KB · $15/mo
www.icann.org
Other
Costly
Execution 328ms
Transfer 282 KB
Unused 49%
Monthly Cost $4/mo
www.icann.org
Other
Costly
Execution 320ms
Transfer 61 KB
Monthly Cost $4/mo
Unattributable
Other
Costly
Execution 304ms
Transfer 0 KB
Monthly Cost $4/mo
OneTrust
Consent
Essential
Execution 79ms
Transfer 112 KB
Unused 54%
Monthly Cost $1/mo
www.icann.org
Other
Optional
Execution 71ms
Transfer 0 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.icann.org adds 328ms and costs ~$4/month
  • www.icann.org adds 320ms and costs ~$4/month
  • Unattributable adds 304ms and costs ~$4/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.icann.org takes 328ms 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

www.icann.org takes 320ms 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

Unattributable takes 304ms 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

54% of OneTrust'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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