Skip to content
https://torproject.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
72
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
83
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.
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.

2.20 s

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

8.60 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.

0.061

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

2.90 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.

8.66 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
17
8 PASS 4 REVIEW 3 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
33 resources · 1.5 MB · 109 KB savings available
FIX
33 resources · 1.5 MB · 109 KB savings available
Warning::
Page weight 483 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~109 KB of savings available
Warning::
32 third-party resources (100% of weight)
33 resources · 1.5 MiB · 32 third-party 483.2 KiB over 1MB target
Image 48% · 723.8 KiB
Font 36% · 536.8 KiB
JavaScript 12% · 188.2 KiB
CSS 3% · 52.4 KiB
Document 0% · 5.9 KiB

~109.2 KiB of savings available

Remove unused JavaScript: 109.2 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
Page Weight Budget
1.5 MB transferred, 33 requests
REVIEW
1.5 MB transferred, 33 requests
Info::
Page weighs 2.8 MB (1.5 MB transferred)
Info::
Fonts are 537 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 537 KB
Info::
33 HTTP requests
Info::
Estimated 0.31 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
33 requests
0.31 g CO2 per page load
Images 716.8 KiB 48%
Fonts 536.8 KiB 36%
JavaScript 188.2 KiB 12%
CSS 52.4 KiB 3%
Other 7.4 KiB 0%
HTML 5.5 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
Image Optimization
Action
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
https://www.torproject.org/static/images/home/svg/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.torproject.org/static/images/home/svg/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.torproject.org/static/images/home/svg/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.torproject.org/static/images/tor-logo@... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.torproject.org/static/images/home/svg/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.torproject.org/static/images/home/svg/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 717 KB
0 oversized -0 KB
14 legacy format
6 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

B
JS Execution Cost
819ms total JS execution
REVIEW
819ms total JS execution
Warning::
Unattributable: 489ms CPU time
Warning::
https://www.torproject.org/: 276ms CPU time
Info::
https://www.torproject.org/static/js/jquery-3.2.1....: 54ms CPU time
Warning::
Third-party scripts: 819ms (100% of total)

Main Thread Breakdown

Other 48% Style & Layout 29% Script Evaluation 9% Rendering 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable489ms6ms0ms3rd
https://www.torproject.org/276ms3ms0ms3rd
https://www.torproject.org/static/js/jquery-3.2.1.min.js?h=1055018c54ms32ms8ms3rd
B
JS Bundles
7 scripts, 109 KB unused
REVIEW
7 scripts, 109 KB unused
Warning::
https://www.torproject.org/static/js/jquery-3.2.1....: 56 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.torproject.org/static/js/bootstrap.bun...: 53 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 109 KB
109 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.torproject.org/static/js/jquery-3.2.1.min.js?h=1055018c85 KB56 KB (66%)✓3rd
https://www.torproject.org/static/js/bootstrap.bundle.min.js?h=46d1f82f69 KB53 KB (78%)✓3rd
https://www.torproject.org/static/js/popper.min.js?h=a433671920 KB—✓3rd
https://www.torproject.org/static/js/scrollspy.min.js?h=026741327 KB—✓3rd
https://www.torproject.org/static/js/modernizr.js?h=9a7f06095 KB—✓3rd
https://www.torproject.org/static/js/download.js?h=4ce9d0951 KB—✓3rd
https://www.torproject.org/static/js/fallback.js?h=8a716acd2 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

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
4 fonts (537 KB)
PASS
4 fonts (537 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

537 KB total

Render-blocking

0

of 4

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 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.2 s LCP 8.6 shttps://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Regular.ttfSourceSansPro-Regular.ttf https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Regular.ttf — 128.2 KiB — 340 ms — font-display: swaphttps://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Light.ttfSourceSansPro-Light.ttf https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Light.ttf — 127.2 KiB — 384 ms — font-display: swaphttps://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Bold.ttfSourceSansPro-Bold.ttf https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Bold.ttf — 127.0 KiB — 384 ms — font-display: swaphttps://www.torproject.org/static/fonts/fontawesome/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.torproject.org/static/fonts/fontawesome/webfonts/fa-solid-900.woff2 — 154.4 KiB — 432 ms — font-display: swap
SourceSansPro-Regular.ttf ttf swap
Size 128 KB
Load time 340 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
SourceSansPro-Light.ttf ttf swap
Size 127 KB
Load time 384 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
SourceSansPro-Bold.ttf ttf swap
Size 127 KB
Load time 384 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-solid-900.woff2 woff2 swap
Size 154 KB
Load time 432 ms
Start 1.8 s
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 ~383 KB and ~766 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
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Hetzner Online GmbH

Network Waterfall
33 requests over 2433ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.2 s LCP 8.6 shttps://torproject.org// https://torproject.org/ — 301 — 415 B — 341 ms — http/1.1https://www.torproject.org/www.torproject.org/ https://www.torproject.org/ — 200 — 5.5 KiB — 394 ms — http/1.1https://www.torproject.org/static/images/circle-pattern.png?h=9a4040e4www.torproject.org/static/images/ci... https://www.torproject.org/static/images/circle-pattern.png?h=9a4040e4 — -1 — 0 B — 1.0 s — https://www.torproject.org/static/css/bootstrap.css?h=0d5c9bf6www.torproject.org/static/css/boots... https://www.torproject.org/static/css/bootstrap.css?h=0d5c9bf6 — 200 — 29.7 KiB — 269 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/css/all.min.css?h=3c73ff1cwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/css/all.min.css?h=3c73ff1c — 200 — 22.7 KiB — 524 ms — http/1.1https://www.torproject.org/static/images/tor-logo@2x.png?h=16ad42bcwww.torproject.org/static/images/to... https://www.torproject.org/static/images/tor-logo@2x.png?h=16ad42bc — 200 — 10.6 KiB — 407 ms — http/1.1https://www.torproject.org/static/images/home/png/block-trackers@3x.png?h=70991bcbwww.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/png/block-trackers@3x.png?h=70991bcb — 200 — 65.8 KiB — 641 ms — http/1.1https://www.torproject.org/static/images/home/png/surveillance@3x.png?h=688a829cwww.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/png/surveillance@3x.png?h=688a829c — 200 — 63.1 KiB — 637 ms — http/1.1https://www.torproject.org/static/images/home/png/fingerprinting@3x.png?h=11fc8c97www.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/png/fingerprinting@3x.png?h=11fc8c97 — 200 — 98.5 KiB — 715 ms — http/1.1https://www.torproject.org/static/js/jquery-3.2.1.min.js?h=1055018cwww.torproject.org/static/js/jquery... https://www.torproject.org/static/js/jquery-3.2.1.min.js?h=1055018c — 200 — 85.4 KiB — 704 ms — http/1.1https://www.torproject.org/static/images/home/png/encryption@3x.png?h=4b28f3ddwww.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/png/encryption@3x.png?h=4b28f3dd — 200 — 70.0 KiB — 226 ms — http/1.1https://www.torproject.org/static/js/popper.min.js?h=a4336719www.torproject.org/static/js/popper... https://www.torproject.org/static/js/popper.min.js?h=a4336719 — 200 — 19.5 KiB — 155 ms — http/1.1data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3E%3C…www.w3.org/2000/svg'%3E%3C… data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3E%3C… — 200 — 0 B — 0 ms — datahttps://www.torproject.org/static/fonts/fontawesome/png/white/solid/arrow-down.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/solid/arrow-down.png — 200 — 4.1 KiB — 241 ms — http/1.1https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Regular.ttfwww.torproject.org/static/fonts/Sou... https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Regular.ttf — 200 — 128.2 KiB — 340 ms — http/1.1https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Light.ttfwww.torproject.org/static/fonts/Sou... https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Light.ttf — 200 — 127.2 KiB — 384 ms — http/1.1https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Bold.ttfwww.torproject.org/static/fonts/Sou... https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Bold.ttf — 200 — 127.0 KiB — 384 ms — http/1.1https://www.torproject.org/static/js/bootstrap.bundle.min.js?h=46d1f82fwww.torproject.org/static/js/bootst... https://www.torproject.org/static/js/bootstrap.bundle.min.js?h=46d1f82f — 200 — 68.6 KiB — 178 ms — http/1.1https://www.torproject.org/static/js/scrollspy.min.js?h=02674132www.torproject.org/static/js/scroll... https://www.torproject.org/static/js/scrollspy.min.js?h=02674132 — 200 — 7.1 KiB — 116 ms — http/1.1https://www.torproject.org/static/js/modernizr.js?h=9a7f0609www.torproject.org/static/js/modern... https://www.torproject.org/static/js/modernizr.js?h=9a7f0609 — 200 — 4.6 KiB — 116 ms — http/1.1https://www.torproject.org/static/js/download.js?h=4ce9d095www.torproject.org/static/js/downlo... https://www.torproject.org/static/js/download.js?h=4ce9d095 — 200 — 1.2 KiB — 113 ms — http/1.1https://www.torproject.org/static/js/fallback.js?h=8a716acdwww.torproject.org/static/js/fallba... https://www.torproject.org/static/js/fallback.js?h=8a716acd — 200 — 1.8 KiB — 112 ms — http/1.1https://www.torproject.org/static/images/home/png/browse-freely@3x.png?h=23b7d7d3www.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/png/browse-freely@3x.png?h=23b7d7d3 — 200 — 97.6 KiB — 143 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/primary/solid/arrow-down.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/primary/solid/arrow-down.png — 200 — 4.0 KiB — 113 ms — http/1.1https://www.torproject.org/static/images/home/svg/block-trackers.svg?h=70991bcbwww.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/svg/block-trackers.svg?h=70991bcb — 200 — 29.2 KiB — 225 ms — http/1.1https://www.torproject.org/static/images/home/svg/surveillance.svg?h=688a829cwww.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/svg/surveillance.svg?h=688a829c — 200 — 41.4 KiB — 185 ms — http/1.1https://www.torproject.org/static/images/home/svg/fingerprinting.svg?h=11fc8c97www.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/svg/fingerprinting.svg?h=11fc8c97 — 200 — 92.1 KiB — 265 ms — http/1.1https://www.torproject.org/static/images/home/svg/encryption.svg?h=4b28f3ddwww.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/svg/encryption.svg?h=4b28f3dd — 200 — 49.1 KiB — 259 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/webfonts/fa-solid-900.woff2www.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/webfonts/fa-solid-900.woff2 — 200 — 154.4 KiB — 432 ms — http/1.1https://www.torproject.org/static/images/home/svg/browse-freely.svg?h=23b7d7d3www.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/svg/browse-freely.svg?h=23b7d7d3 — 200 — 88.7 KiB — 341 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.2 s LCP 8.6 shttps://torproject.org// https://torproject.org/ — 301 — 415 B — 341 ms — http/1.1https://www.torproject.org/www.torproject.org/ https://www.torproject.org/ — 200 — 5.5 KiB — 394 ms — http/1.1https://www.torproject.org/static/images/circle-pattern.png?h=9a4040e4www.torproject.org/static/images/ci... https://www.torproject.org/static/images/circle-pattern.png?h=9a4040e4 — -1 — 0 B — 1.0 s — https://www.torproject.org/static/css/bootstrap.css?h=0d5c9bf6www.torproject.org/static/css/boots... https://www.torproject.org/static/css/bootstrap.css?h=0d5c9bf6 — 200 — 29.7 KiB — 269 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/css/all.min.css?h=3c73ff1cwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/css/all.min.css?h=3c73ff1c — 200 — 22.7 KiB — 524 ms — http/1.1https://www.torproject.org/static/images/tor-logo@2x.png?h=16ad42bcwww.torproject.org/static/images/to... https://www.torproject.org/static/images/tor-logo@2x.png?h=16ad42bc — 200 — 10.6 KiB — 407 ms — http/1.1https://www.torproject.org/static/images/home/png/block-trackers@3x.png?h=70991bcbwww.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/png/block-trackers@3x.png?h=70991bcb — 200 — 65.8 KiB — 641 ms — http/1.1https://www.torproject.org/static/images/home/png/surveillance@3x.png?h=688a829cwww.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/png/surveillance@3x.png?h=688a829c — 200 — 63.1 KiB — 637 ms — http/1.1https://www.torproject.org/static/images/home/png/fingerprinting@3x.png?h=11fc8c97www.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/png/fingerprinting@3x.png?h=11fc8c97 — 200 — 98.5 KiB — 715 ms — http/1.1https://www.torproject.org/static/js/jquery-3.2.1.min.js?h=1055018cwww.torproject.org/static/js/jquery... https://www.torproject.org/static/js/jquery-3.2.1.min.js?h=1055018c — 200 — 85.4 KiB — 704 ms — http/1.1https://www.torproject.org/static/images/home/png/encryption@3x.png?h=4b28f3ddwww.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/png/encryption@3x.png?h=4b28f3dd — 200 — 70.0 KiB — 226 ms — http/1.1https://www.torproject.org/static/js/popper.min.js?h=a4336719www.torproject.org/static/js/popper... https://www.torproject.org/static/js/popper.min.js?h=a4336719 — 200 — 19.5 KiB — 155 ms — http/1.1data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3E%3C…www.w3.org/2000/svg'%3E%3C… data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3E%3C… — 200 — 0 B — 0 ms — datahttps://www.torproject.org/static/fonts/fontawesome/png/white/solid/arrow-down.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/solid/arrow-down.png — 200 — 4.1 KiB — 241 ms — http/1.1https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Regular.ttfwww.torproject.org/static/fonts/Sou... https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Regular.ttf — 200 — 128.2 KiB — 340 ms — http/1.1https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Light.ttfwww.torproject.org/static/fonts/Sou... https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Light.ttf — 200 — 127.2 KiB — 384 ms — http/1.1https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Bold.ttfwww.torproject.org/static/fonts/Sou... https://www.torproject.org/static/fonts/SourceSansPro/SourceSansPro-Bold.ttf — 200 — 127.0 KiB — 384 ms — http/1.1https://www.torproject.org/static/js/bootstrap.bundle.min.js?h=46d1f82fwww.torproject.org/static/js/bootst... https://www.torproject.org/static/js/bootstrap.bundle.min.js?h=46d1f82f — 200 — 68.6 KiB — 178 ms — http/1.1https://www.torproject.org/static/js/scrollspy.min.js?h=02674132www.torproject.org/static/js/scroll... https://www.torproject.org/static/js/scrollspy.min.js?h=02674132 — 200 — 7.1 KiB — 116 ms — http/1.1https://www.torproject.org/static/js/modernizr.js?h=9a7f0609www.torproject.org/static/js/modern... https://www.torproject.org/static/js/modernizr.js?h=9a7f0609 — 200 — 4.6 KiB — 116 ms — http/1.1https://www.torproject.org/static/js/download.js?h=4ce9d095www.torproject.org/static/js/downlo... https://www.torproject.org/static/js/download.js?h=4ce9d095 — 200 — 1.2 KiB — 113 ms — http/1.1https://www.torproject.org/static/js/fallback.js?h=8a716acdwww.torproject.org/static/js/fallba... https://www.torproject.org/static/js/fallback.js?h=8a716acd — 200 — 1.8 KiB — 112 ms — http/1.1https://www.torproject.org/static/images/home/png/browse-freely@3x.png?h=23b7d7d3www.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/png/browse-freely@3x.png?h=23b7d7d3 — 200 — 97.6 KiB — 143 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/primary/solid/arrow-down.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/primary/solid/arrow-down.png — 200 — 4.0 KiB — 113 ms — http/1.1https://www.torproject.org/static/images/home/svg/block-trackers.svg?h=70991bcbwww.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/svg/block-trackers.svg?h=70991bcb — 200 — 29.2 KiB — 225 ms — http/1.1https://www.torproject.org/static/images/home/svg/surveillance.svg?h=688a829cwww.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/svg/surveillance.svg?h=688a829c — 200 — 41.4 KiB — 185 ms — http/1.1https://www.torproject.org/static/images/home/svg/fingerprinting.svg?h=11fc8c97www.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/svg/fingerprinting.svg?h=11fc8c97 — 200 — 92.1 KiB — 265 ms — http/1.1https://www.torproject.org/static/images/home/svg/encryption.svg?h=4b28f3ddwww.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/svg/encryption.svg?h=4b28f3dd — 200 — 49.1 KiB — 259 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/webfonts/fa-solid-900.woff2www.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/webfonts/fa-solid-900.woff2 — 200 — 154.4 KiB — 432 ms — http/1.1https://www.torproject.org/static/images/home/svg/browse-freely.svg?h=23b7d7d3www.torproject.org/static/images/ho... https://www.torproject.org/static/images/home/svg/browse-freely.svg?h=23b7d7d3 — 200 — 88.7 KiB — 341 ms — http/1.1https://www.torproject.org/static/images/circle-pattern.svg?h=9a4040e4www.torproject.org/static/images/ci... https://www.torproject.org/static/images/circle-pattern.svg?h=9a4040e4 — 200 — 2.5 KiB — 155 ms — http/1.1https://www.torproject.org/static/images/favicon/favicon.pngwww.torproject.org/static/images/fa... https://www.torproject.org/static/images/favicon/favicon.png — 200 — 2.0 KiB — 122 ms — http/1.1https://www.torproject.org/static/images/favicon/favicon.icowww.torproject.org/static/images/fa... https://www.torproject.org/static/images/favicon/favicon.ico — 200 — 5.0 KiB — 113 ms — http/1.1
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 819ms · 91KB · $11/mo
Unattributable
Other
Costly
Execution 489ms
Transfer 0 KB
Monthly Cost $6/mo
www.torproject.org
Other
Costly
Execution 276ms
Transfer 6 KB
Monthly Cost $4/mo
www.torproject.org
Other
Optional
Execution 54ms
Transfer 85 KB
Unused 66%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 489ms and costs ~$6/month
  • www.torproject.org adds 276ms 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

Unattributable takes 489ms 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.torproject.org takes 276ms 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

66% of www.torproject.org'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.

Send Feedback