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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
2
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
94
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.
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.

779 ms

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

1.53 s

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

0 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.

811 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.53 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
9 PASS 2 REVIEW 2 FIX
F
Page Weight Budget
Action
5.2 MB transferred, 33 requests
FIX
5.2 MB transferred, 33 requests
Critical::
Page weighs 5.5 MB (5.2 MB transferred)
Warning::
Images are 5.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.1 MB
Info::
33 HTTP requests
Info::
Estimated 1.1 g CO2 per page load
5.2 MB / 2.4 MB budget
5.2 MB transferred
33 requests
1.1 g CO2 per page load
Images 5.1 MiB 98%
JavaScript 62.0 KiB 1%
CSS 27.8 KiB 1%
Other 24.8 KiB 0%
HTML 7.4 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

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: max-age=0, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, no-store

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-store—Never cache this response
C
Image Optimization
Action
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://iacr.org/img/jofc2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/img/icons/search.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/conf/generic_asiacrypt.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/conf/generic_ches.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/img/icons/news/channel_1.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/img/icons/news/channel_10.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/img/icons/youtube.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/conf/generic_pkc.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/conf/generic_tcc.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/conf/generic_rwc.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/img/lncs2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/img/open_access.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/images/new_tiny.gif is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/img/icons/twitter.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/conf/generic_eurocrypt.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/conf/generic_crypto.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/img/icons/news/channel_8.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/img/eprint.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/cryptodb/youtube/Verbauwhede.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iacr.org/conf/generic_fse.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 5.1 MB
0 oversized -0 KB
24 legacy format
20 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

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
Page Weight Inventory
Action
33 resources · 5.2 MB · 0 KB savings available
REVIEW
33 resources · 5.2 MB · 0 KB savings available
Warning::
Page weight 4.2 MB over 1MB target
Got: 5.2 MB Expected: ≤ 1 MB
Info::
2 resources over 200KB
33 resources · 5.2 MiB · 0 third-party 4.2 MiB over 1MB target
Image 98% · 5.1 MiB
JavaScript 1% · 62.0 KiB
CSS 1% · 27.8 KiB
Document 0% · 7.4 KiB
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-party.
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+
JS Execution Cost
264ms total JS execution
PASS
264ms total JS execution
Info::
Unattributable: 180ms CPU time
Info::
https://iacr.org/: 84ms CPU time
Warning::
Third-party scripts: 180ms (68% of total)

Main Thread Breakdown

Other 67% Style & Layout 15% Script Evaluation 9% Rendering 3% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable180ms2ms0ms3rd
https://iacr.org/84ms2ms1ms1st
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
JS Bundles
4 scripts, 0 KB unused
PASS
4 scripts, 0 KB unused
Warning::
https://iacr.org/libs/js/easy-autocomplete/jquery....: unminified — 2 KB could be saved
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://iacr.org/libs/js/jquery/3.3.1/jquery.min.js30 KB—✓1st
https://iacr.org/libs/css/bootstrap/dist/js/bootstrap.bundle.min.js22 KB—✓1st
https://iacr.org/libs/js/easy-autocomplete/jquery.easy-autocomplete.js8 KB—✗1st
https://iacr.org/js/search.js2 KB—✓1st
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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
33 requests over 1103ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 779 ms LCP 1.5 shttps://iacr.org// https://iacr.org/ — 200 — 7.4 KiB — 256 ms — h3https://iacr.org/libs/css/bootstrap/dist/css/bootstrap.min.css/libs/css/bootstrap/dist/css/bootst... https://iacr.org/libs/css/bootstrap/dist/css/bootstrap.min.css — 200 — 23.2 KiB — 299 ms — h3https://iacr.org/css/iacr.css/css/iacr.css https://iacr.org/css/iacr.css — 200 — 2.6 KiB — 170 ms — h3https://iacr.org/libs/js/easy-autocomplete/easy-autocomplete.css/libs/js/easy-autocomplete/easy-aut... https://iacr.org/libs/js/easy-autocomplete/easy-autocomplete.css — 200 — 2.0 KiB — 283 ms — h3https://iacr.org/img/logo/iacrlogo_small.png/img/logo/iacrlogo_small.png https://iacr.org/img/logo/iacrlogo_small.png — 200 — 24.7 KiB — 209 ms — h3https://iacr.org/img/icons/search.svg/img/icons/search.svg https://iacr.org/img/icons/search.svg — 200 — 911 B — 172 ms — h3https://iacr.org/conf/generic_eurocrypt.jpg/conf/generic_eurocrypt.jpg https://iacr.org/conf/generic_eurocrypt.jpg — 200 — 134.7 KiB — 335 ms — h3https://iacr.org/conf/generic_crypto.jpg/conf/generic_crypto.jpg https://iacr.org/conf/generic_crypto.jpg — 200 — 66.1 KiB — 231 ms — h3https://iacr.org/libs/js/jquery/3.3.1/jquery.min.js/libs/js/jquery/3.3.1/jquery.min.js https://iacr.org/libs/js/jquery/3.3.1/jquery.min.js — 200 — 30.1 KiB — 277 ms — h3https://iacr.org/libs/css/bootstrap/dist/js/bootstrap.bundle.min.js/libs/css/bootstrap/dist/js/bootstr... https://iacr.org/libs/css/bootstrap/dist/js/bootstrap.bundle.min.js — 200 — 22.3 KiB — 267 ms — h3https://iacr.org/libs/js/easy-autocomplete/jquery.easy-autocomplete.js/libs/js/easy-autocomplete/jquery.e... https://iacr.org/libs/js/easy-autocomplete/jquery.easy-autocomplete.js — 200 — 7.9 KiB — 293 ms — h3https://iacr.org/js/search.js/js/search.js https://iacr.org/js/search.js — 200 — 1.7 KiB — 245 ms — h3https://iacr.org/conf/generic_asiacrypt.jpg/conf/generic_asiacrypt.jpg https://iacr.org/conf/generic_asiacrypt.jpg — 200 — 106.4 KiB — 291 ms — h3https://iacr.org/conf/generic_fse.jpg/conf/generic_fse.jpg https://iacr.org/conf/generic_fse.jpg — 200 — 37.7 KiB — 257 ms — h3https://iacr.org/conf/generic_pkc.jpg/conf/generic_pkc.jpg https://iacr.org/conf/generic_pkc.jpg — 200 — 84.4 KiB — 191 ms — h3https://iacr.org/conf/generic_ches.jpg/conf/generic_ches.jpg https://iacr.org/conf/generic_ches.jpg — 200 — 106.2 KiB — 212 ms — h3https://iacr.org/conf/generic_tcc.jpg/conf/generic_tcc.jpg https://iacr.org/conf/generic_tcc.jpg — 200 — 110.8 KiB — 293 ms — h3https://iacr.org/conf/generic_rwc.jpg/conf/generic_rwc.jpg https://iacr.org/conf/generic_rwc.jpg — 200 — 82.9 KiB — 257 ms — h3https://iacr.org/img/icons/news/channel_1.svg/img/icons/news/channel_1.svg https://iacr.org/img/icons/news/channel_1.svg — 200 — 902 B — 262 ms — h3https://iacr.org/img/icons/news/channel_8.svg/img/icons/news/channel_8.svg https://iacr.org/img/icons/news/channel_8.svg — 200 — 785 B — 272 ms — h3https://iacr.org/img/icons/news/channel_10.svg/img/icons/news/channel_10.svg https://iacr.org/img/icons/news/channel_10.svg — 200 — 759 B — 244 ms — h3https://iacr.org/img/jofc2.png/img/jofc2.png https://iacr.org/img/jofc2.png — 200 — 893.6 KiB — 328 ms — h3https://iacr.org/img/lncs2.png/img/lncs2.png https://iacr.org/img/lncs2.png — 200 — 20.3 KiB — 244 ms — h3https://iacr.org/img/open_access.svg/img/open_access.svg https://iacr.org/img/open_access.svg — 200 — 972 B — 311 ms — h3https://iacr.org/images/new_tiny.gif/images/new_tiny.gif https://iacr.org/images/new_tiny.gif — 200 — 659 B — 258 ms — h3https://iacr.org/img/eprint.png/img/eprint.png https://iacr.org/img/eprint.png — 200 — 3.4 MiB — 689 ms — h3https://iacr.org/cryptodb/youtube/Verbauwhede.jpg/cryptodb/youtube/Verbauwhede.jpg https://iacr.org/cryptodb/youtube/Verbauwhede.jpg — 200 — 15.3 KiB — 242 ms — h3https://iacr.org/img/icons/youtube-black.png/img/icons/youtube-black.png https://iacr.org/img/icons/youtube-black.png — 200 — 8.2 KiB — 313 ms — h3https://iacr.org/img/icons/youtube-red.png/img/icons/youtube-red.png https://iacr.org/img/icons/youtube-red.png — 200 — 9.7 KiB — 218 ms — h3https://iacr.org/img/icons/twitter.svg/img/icons/twitter.svg https://iacr.org/img/icons/twitter.svg — 200 — 978 B — 278 ms — h3
0 ms 500 ms 1.0 s 1.5 s FCP 779 ms LCP 1.5 shttps://iacr.org// https://iacr.org/ — 200 — 7.4 KiB — 256 ms — h3https://iacr.org/libs/css/bootstrap/dist/css/bootstrap.min.css/libs/css/bootstrap/dist/css/bootst... https://iacr.org/libs/css/bootstrap/dist/css/bootstrap.min.css — 200 — 23.2 KiB — 299 ms — h3https://iacr.org/css/iacr.css/css/iacr.css https://iacr.org/css/iacr.css — 200 — 2.6 KiB — 170 ms — h3https://iacr.org/libs/js/easy-autocomplete/easy-autocomplete.css/libs/js/easy-autocomplete/easy-aut... https://iacr.org/libs/js/easy-autocomplete/easy-autocomplete.css — 200 — 2.0 KiB — 283 ms — h3https://iacr.org/img/logo/iacrlogo_small.png/img/logo/iacrlogo_small.png https://iacr.org/img/logo/iacrlogo_small.png — 200 — 24.7 KiB — 209 ms — h3https://iacr.org/img/icons/search.svg/img/icons/search.svg https://iacr.org/img/icons/search.svg — 200 — 911 B — 172 ms — h3https://iacr.org/conf/generic_eurocrypt.jpg/conf/generic_eurocrypt.jpg https://iacr.org/conf/generic_eurocrypt.jpg — 200 — 134.7 KiB — 335 ms — h3https://iacr.org/conf/generic_crypto.jpg/conf/generic_crypto.jpg https://iacr.org/conf/generic_crypto.jpg — 200 — 66.1 KiB — 231 ms — h3https://iacr.org/libs/js/jquery/3.3.1/jquery.min.js/libs/js/jquery/3.3.1/jquery.min.js https://iacr.org/libs/js/jquery/3.3.1/jquery.min.js — 200 — 30.1 KiB — 277 ms — h3https://iacr.org/libs/css/bootstrap/dist/js/bootstrap.bundle.min.js/libs/css/bootstrap/dist/js/bootstr... https://iacr.org/libs/css/bootstrap/dist/js/bootstrap.bundle.min.js — 200 — 22.3 KiB — 267 ms — h3https://iacr.org/libs/js/easy-autocomplete/jquery.easy-autocomplete.js/libs/js/easy-autocomplete/jquery.e... https://iacr.org/libs/js/easy-autocomplete/jquery.easy-autocomplete.js — 200 — 7.9 KiB — 293 ms — h3https://iacr.org/js/search.js/js/search.js https://iacr.org/js/search.js — 200 — 1.7 KiB — 245 ms — h3https://iacr.org/conf/generic_asiacrypt.jpg/conf/generic_asiacrypt.jpg https://iacr.org/conf/generic_asiacrypt.jpg — 200 — 106.4 KiB — 291 ms — h3https://iacr.org/conf/generic_fse.jpg/conf/generic_fse.jpg https://iacr.org/conf/generic_fse.jpg — 200 — 37.7 KiB — 257 ms — h3https://iacr.org/conf/generic_pkc.jpg/conf/generic_pkc.jpg https://iacr.org/conf/generic_pkc.jpg — 200 — 84.4 KiB — 191 ms — h3https://iacr.org/conf/generic_ches.jpg/conf/generic_ches.jpg https://iacr.org/conf/generic_ches.jpg — 200 — 106.2 KiB — 212 ms — h3https://iacr.org/conf/generic_tcc.jpg/conf/generic_tcc.jpg https://iacr.org/conf/generic_tcc.jpg — 200 — 110.8 KiB — 293 ms — h3https://iacr.org/conf/generic_rwc.jpg/conf/generic_rwc.jpg https://iacr.org/conf/generic_rwc.jpg — 200 — 82.9 KiB — 257 ms — h3https://iacr.org/img/icons/news/channel_1.svg/img/icons/news/channel_1.svg https://iacr.org/img/icons/news/channel_1.svg — 200 — 902 B — 262 ms — h3https://iacr.org/img/icons/news/channel_8.svg/img/icons/news/channel_8.svg https://iacr.org/img/icons/news/channel_8.svg — 200 — 785 B — 272 ms — h3https://iacr.org/img/icons/news/channel_10.svg/img/icons/news/channel_10.svg https://iacr.org/img/icons/news/channel_10.svg — 200 — 759 B — 244 ms — h3https://iacr.org/img/jofc2.png/img/jofc2.png https://iacr.org/img/jofc2.png — 200 — 893.6 KiB — 328 ms — h3https://iacr.org/img/lncs2.png/img/lncs2.png https://iacr.org/img/lncs2.png — 200 — 20.3 KiB — 244 ms — h3https://iacr.org/img/open_access.svg/img/open_access.svg https://iacr.org/img/open_access.svg — 200 — 972 B — 311 ms — h3https://iacr.org/images/new_tiny.gif/images/new_tiny.gif https://iacr.org/images/new_tiny.gif — 200 — 659 B — 258 ms — h3https://iacr.org/img/eprint.png/img/eprint.png https://iacr.org/img/eprint.png — 200 — 3.4 MiB — 689 ms — h3https://iacr.org/cryptodb/youtube/Verbauwhede.jpg/cryptodb/youtube/Verbauwhede.jpg https://iacr.org/cryptodb/youtube/Verbauwhede.jpg — 200 — 15.3 KiB — 242 ms — h3https://iacr.org/img/icons/youtube-black.png/img/icons/youtube-black.png https://iacr.org/img/icons/youtube-black.png — 200 — 8.2 KiB — 313 ms — h3https://iacr.org/img/icons/youtube-red.png/img/icons/youtube-red.png https://iacr.org/img/icons/youtube-red.png — 200 — 9.7 KiB — 218 ms — h3https://iacr.org/img/icons/twitter.svg/img/icons/twitter.svg https://iacr.org/img/icons/twitter.svg — 200 — 978 B — 278 ms — h3https://iacr.org/img/icons/youtube.svg/img/icons/youtube.svg https://iacr.org/img/icons/youtube.svg — 200 — 887 B — 284 ms — h3https://iacr.org/img/tris.svg/img/tris.svg https://iacr.org/img/tris.svg — 200 — 6.3 KiB — 132 ms — h3https://iacr.org/favicon.ico/favicon.ico https://iacr.org/favicon.ico — 200 — 24.8 KiB — 120 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
68% of JavaScript execution is third-party
First-party Third-party 180ms · 0KB · €2/mo
Unattributable
Other
Optional
Execution 180ms
Transfer 0 KB
Monthly Cost €2/mo

68% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

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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