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https://torproject.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
93
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
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.

644 ms

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

1.67 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.

0.012

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

1.09 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.

1.67 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
7 PASS 3 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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
39 resources · 1.7 MB · 109 KB savings available
FIX
39 resources · 1.7 MB · 109 KB savings available
Warning::
Page weight 681 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~109 KB of savings available
Warning::
38 third-party resources (100% of weight)
39 resources · 1.7 MiB · 38 third-party 680.6 KiB over 1MB target
Image 47% · 805.0 KiB
Font 38% · 653.0 KiB
JavaScript 11% · 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.

C
Page Weight Budget
Action
1.7 MB transferred, 39 requests
REVIEW
1.7 MB transferred, 39 requests
Info::
Page weighs 2.9 MB (1.7 MB transferred)
Info::
Fonts are 653 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 653 KB
Info::
39 HTTP requests
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
39 requests
0.35 g CO2 per page load
Images 798.0 KiB 47%
Fonts 653.0 KiB 38%
JavaScript 188.2 KiB 11%
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
21 images, 0 KB saveable
REVIEW
21 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/circle-pa... 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/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.
21 images 798 KB
0 oversized -0 KB
21 legacy format
7 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

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+
JS Execution Cost
239ms total JS execution
PASS
239ms total JS execution
Info::
Unattributable: 145ms CPU time
Info::
https://www.torproject.org/: 93ms CPU time
Warning::
Third-party scripts: 239ms (100% of total)

Main Thread Breakdown

Other 46% Style & Layout 30% Rendering 8% Script Evaluation 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable145ms2ms0ms3rd
https://www.torproject.org/93ms2ms0ms3rd
A+
Font Loading
5 fonts (653 KB)
PASS
5 fonts (653 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

653 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 644 ms LCP 1.7 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 — 344 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 — 349 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 — 306 ms — font-display: swaphttps://www.torproject.org/static/fonts/fontawesome/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.torproject.org/static/fonts/fontawesome/webfonts/fa-brands-400.woff2 — 116.2 KiB — 357 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 — 186 ms — font-display: swap
SourceSansPro-Regular.ttf ttf swap
Size 128 KB
Load time 344 ms
Start 1.2 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 349 ms
Start 1.2 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 306 ms
Start 1.2 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-brands-400.woff2 woff2 swap
Size 116 KB
Load time 357 ms
Start 1.2 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
fa-solid-900.woff2 woff2 swap
Size 154 KB
Load time 186 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 ~441 KB and ~882 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+
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
39 requests over 2357ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 644 ms LCP 1.7 shttps://torproject.org// https://torproject.org/ — 301 — 415 B — 346 ms — http/1.1https://www.torproject.org/www.torproject.org/ https://www.torproject.org/ — 200 — 5.5 KiB — 348 ms — http/1.1https://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 — 231 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 — 472 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 — 354 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 — 587 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 — 588 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 — 620 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 — 635 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 — 396 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 — 408 ms — http/1.1https://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 — 263 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 — 344 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 — 349 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 — 306 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/webfonts/fa-brands-400.woff2www.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/webfonts/fa-brands-400.woff2 — 200 — 116.2 KiB — 357 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 — 326 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 — 114 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 — 112 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 — 111 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 — 146 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 — 200 — 47.6 KiB — 134 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 — 112 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/white/brands/facebook.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/brands/facebook.png — 200 — 2.9 KiB — 112 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/white/brands/mastodon.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/brands/mastodon.png — 200 — 6.3 KiB — 115 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/white/brands/instagram.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/brands/instagram.png — 200 — 6.2 KiB — 113 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/white/brands/twitter.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/brands/twitter.png — 200 — 6.3 KiB — 113 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/white/brands/linkedin.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/brands/linkedin.png — 200 — 3.8 KiB — 112 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/white/brands/github.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/brands/github.png — 200 — 8.2 KiB — 113 ms — http/1.1
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 644 ms LCP 1.7 shttps://torproject.org// https://torproject.org/ — 301 — 415 B — 346 ms — http/1.1https://www.torproject.org/www.torproject.org/ https://www.torproject.org/ — 200 — 5.5 KiB — 348 ms — http/1.1https://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 — 231 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 — 472 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 — 354 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 — 587 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 — 588 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 — 620 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 — 635 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 — 396 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 — 408 ms — http/1.1https://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 — 263 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 — 344 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 — 349 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 — 306 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/webfonts/fa-brands-400.woff2www.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/webfonts/fa-brands-400.woff2 — 200 — 116.2 KiB — 357 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 — 326 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 — 114 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 — 112 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 — 111 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 — 146 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 — 200 — 47.6 KiB — 134 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 — 112 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/white/brands/facebook.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/brands/facebook.png — 200 — 2.9 KiB — 112 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/white/brands/mastodon.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/brands/mastodon.png — 200 — 6.3 KiB — 115 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/white/brands/instagram.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/brands/instagram.png — 200 — 6.2 KiB — 113 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/white/brands/twitter.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/brands/twitter.png — 200 — 6.3 KiB — 113 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/white/brands/linkedin.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/brands/linkedin.png — 200 — 3.8 KiB — 112 ms — http/1.1https://www.torproject.org/static/fonts/fontawesome/png/white/brands/github.pngwww.torproject.org/static/fonts/fon... https://www.torproject.org/static/fonts/fontawesome/png/white/brands/github.png — 200 — 8.2 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 — 151 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 — 166 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 — 186 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 — 187 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 — 155 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 — 193 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 — 117 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 — 113 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 239ms · 6KB · $3/mo
Unattributable
Other
Optional
Execution 145ms
Transfer 0 KB
Monthly Cost $2/mo
www.torproject.org
Other
Optional
Execution 93ms
Transfer 6 KB
Monthly Cost $1/mo

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

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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