Skip to content
https://bitcoin.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
2
REVIEW
2
PASS
11
INFO
2

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

Mobile Desktop
58
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.
92
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.

2.49 s

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

5.10 s

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

680 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.

4.75 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.

5.33 s

Page Load Progression

420 ms
840 ms
1.3 s
1.7 s
2.1 s
2.5 s
2.9 s
3.4 s
Checks
17
11 PASS 2 REVIEW 2 FIX
F
JS Execution Cost
Action
6828ms total JS execution
FIX
6828ms total JS execution
Warning::
https://bitcoin.org/js/lottie-player.js?1776683281: 5664ms CPU time
Warning::
Unattributable: 665ms CPU time
Warning::
https://bitcoin.org/en/: 318ms CPU time
Info::
https://bitcoin.org/js/jquery/jquery-1.11.2.min.js: 62ms CPU time
Info::
https://bitcoin.org/js/jquery/jquery-ui.min.js: 60ms CPU time
Info::
Third-party scripts: 723ms (11% of total)

Main Thread Breakdown

Script Evaluation 75% Other 16% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://bitcoin.org/js/lottie-player.js?17766832815664ms5002ms35ms1st
Unattributable665ms7ms0ms3rd
https://bitcoin.org/en/318ms51ms4ms1st
https://bitcoin.org/js/jquery/jquery-1.11.2.min.js62ms38ms9ms1st
https://bitcoin.org/js/jquery/jquery-ui.min.js60ms33ms19ms1st
https://www.google-analytics.com/analytics.js58ms48ms4ms3rd
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
Image Optimization
Action
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
https://bitcoin.org/img/icons/ico_business.svg?177... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bitcoin.org/img/icons/ico_individuals.svg?... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bitcoin.org/img/icons/ico_developers.svg?1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bitcoin.org/img/icons/logo-footer.svg?1776... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bitcoin.org/img/icons/ico_arrow_down.svg?1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 137 KB
0 oversized -0 KB
16 legacy format
5 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

B
JS Bundles
10 scripts, 112 KB unused
REVIEW
10 scripts, 112 KB unused
Warning::
https://bitcoin.org/js/jquery/jquery-ui.min.js: 57 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://bitcoin.org/js/lottie-player.js?1776683281: 55 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://bitcoin.org/js/main.js?1776683281: unminified — 2 KB could be saved
Info::
Total unused JavaScript: 112 KB
112 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://bitcoin.org/js/jquery/jquery-ui.min.js63 KB57 KB (90%)✓1st
https://bitcoin.org/js/lottie-player.js?177668328196 KB55 KB (58%)✓1st
https://bitcoin.org/js/base.js?17766832814 KB—✓1st
https://bitcoin.org/js/main.js?17766832819 KB—✗1st
https://bitcoin.org/js/jquery/jquery-1.11.2.min.js33 KB—✓1st
https://bitcoin.org/js/jquery/jquery.qrcode.min.js5 KB—✓1st
https://bitcoin.org/js/cookieconsent/cookieconsent.js?17766832814 KB—✓1st
https://bitcoin.org/js/analytics.js1 KB—✓1st
https://www.google-analytics.com/analytics.js21 KB—✓3rd
https://www.googletagmanager.com/gtag/js?id=G-G6FD47421W&cx=c&_slc=10 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
Page Weight Budget
949 KB transferred, 45 requests
PASS
949 KB transferred, 45 requests
Info::
Page weighs 5.8 MB (949 KB transferred)
Info::
45 HTTP requests
Info::
Estimated 0.19 g CO2 per page load
949 KB / 2.4 MB budget
949 KB transferred
45 requests
0.19 g CO2 per page load
Other 470.9 KiB 50%
JavaScript 236.4 KiB 25%
Images 137.2 KiB 14%
Fonts 65.3 KiB 7%
CSS 30.4 KiB 3%
HTML 6.1 KiB 1%
Other 2.3 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
2% third-party, 0 ms blocking
PASS
2% third-party, 0 ms blocking
Info::
Third-party code accounts for 2% of page weight (21.4 KiB of 948.6 KiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-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+
Font Loading
3 fonts (65 KB)
PASS
3 fonts (65 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

65 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.5 s LCP 5.1 shttps://bitcoin.org/font/titillium/TitilliumWeb-Regular.woff2TitilliumWeb-Regular.woff2 https://bitcoin.org/font/titillium/TitilliumWeb-Regular.woff2 — 22.3 KiB — 30 ms — font-display: swaphttps://bitcoin.org/font/titillium/TitilliumWeb-SemiBold.woff2TitilliumWeb-SemiBold.w... https://bitcoin.org/font/titillium/TitilliumWeb-SemiBold.woff2 — 22.1 KiB — 27 ms — font-display: swaphttps://bitcoin.org/font/titillium/TitilliumWeb-Bold.woff2TitilliumWeb-Bold.woff2 https://bitcoin.org/font/titillium/TitilliumWeb-Bold.woff2 — 20.9 KiB — 28 ms — font-display: swap
TitilliumWeb-Regular.woff2 woff2 swap
Size 22 KB
Load time 30 ms
Start 639 ms
Risk FOUT — text flashes from fallback to web font
TitilliumWeb-SemiBold.w... woff2 swap
Size 22 KB
Load time 27 ms
Start 639 ms
Risk FOUT — text flashes from fallback to web font
TitilliumWeb-Bold.woff2 woff2 swap
Size 21 KB
Load time 28 ms
Start 639 ms
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+
Page Weight Inventory
45 resources · 949 KB · 112 KB savings available
PASS
45 resources · 949 KB · 112 KB savings available
Info::
Within 1MB page-weight target
Got: 949 KB
Info::
~112 KB of savings available
Info::
3 third-party resources (2% of weight)
Info::
1 resources over 200KB
45 resources · 948.6 KiB · 3 third-party Within 1MB page-weight target
Other 50% · 470.9 KiB
JavaScript 25% · 236.4 KiB
Image 15% · 139.0 KiB
Font 7% · 65.3 KiB
CSS 3% · 30.4 KiB
Document 1% · 6.6 KiB

~111.9 KiB of savings available

Remove unused JavaScript: 111.9 KiB
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: Cloudflare

Network Waterfall
45 requests over 6697ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 2.5 s LCP 5.1 shttps://bitcoin.org// https://bitcoin.org/ — 302 — 556 B — 214 ms — h2https://bitcoin.org/en//en/ https://bitcoin.org/en/ — 200 — 6.1 KiB — 171 ms — h2https://bitcoin.org/css/font-awesome-4.4.0/css/font-awesome.min.css/css/font-awesome-4.4.0/css/font-aw... https://bitcoin.org/css/font-awesome-4.4.0/css/font-awesome.min.css — 200 — 6.5 KiB — 78 ms — h3https://bitcoin.org/css/main.css?1776683281/css/main.css?1776683281 https://bitcoin.org/css/main.css?1776683281 — 200 — 22.5 KiB — 102 ms — h3https://bitcoin.org/js/base.js?1776683281/js/base.js?1776683281 https://bitcoin.org/js/base.js?1776683281 — 200 — 4.5 KiB — 74 ms — h3https://bitcoin.org/js/main.js?1776683281/js/main.js?1776683281 https://bitcoin.org/js/main.js?1776683281 — 200 — 8.8 KiB — 88 ms — h3https://bitcoin.org/js/lottie-player.js?1776683281/js/lottie-player.js?1776683281 https://bitcoin.org/js/lottie-player.js?1776683281 — 200 — 96.2 KiB — 121 ms — h3https://bitcoin.org/js/jquery/jquery-1.11.2.min.js/js/jquery/jquery-1.11.2.min.js https://bitcoin.org/js/jquery/jquery-1.11.2.min.js — 200 — 33.0 KiB — 112 ms — h3https://bitcoin.org/js/jquery/jquery-ui.min.js/js/jquery/jquery-ui.min.js https://bitcoin.org/js/jquery/jquery-ui.min.js — 200 — 63.2 KiB — 119 ms — h3https://bitcoin.org/js/jquery/jquery.qrcode.min.js/js/jquery/jquery.qrcode.min.js https://bitcoin.org/js/jquery/jquery.qrcode.min.js — 200 — 5.2 KiB — 85 ms — h3https://bitcoin.org/js/cookieconsent/cookieconsent.js?1776683281/js/cookieconsent/cookieconsent.js?... https://bitcoin.org/js/cookieconsent/cookieconsent.js?1776683281 — 200 — 3.7 KiB — 82 ms — h3https://bitcoin.org/img/icons/ico_close.svg?1776683281/img/icons/ico_close.svg?1776683281 https://bitcoin.org/img/icons/ico_close.svg?1776683281 — 200 — 1.1 KiB — 70 ms — h3https://bitcoin.org/img/icons/logotop.svg?1776683281/img/icons/logotop.svg?1776683281 https://bitcoin.org/img/icons/logotop.svg?1776683281 — 200 — 3.4 KiB — 79 ms — h3https://bitcoin.org/img/animations/herecomesbitcoin/hungry_right_hand.svg?1776683281/img/animations/herecomesbitcoin/hu... https://bitcoin.org/img/animations/herecomesbitcoin/hungry_right_hand.svg?1776683281 — 200 — 2.0 KiB — 28 ms — h3https://bitcoin.org/img/animations/herecomesbitcoin/hungry_left_hand.svg?1776683281/img/animations/herecomesbitcoin/hu... https://bitcoin.org/img/animations/herecomesbitcoin/hungry_left_hand.svg?1776683281 — 200 — 1.9 KiB — 30 ms — h3https://bitcoin.org/img/icons/ico_individuals.svg?1776683281/img/icons/ico_individuals.svg?1776... https://bitcoin.org/img/icons/ico_individuals.svg?1776683281 — 200 — 1.7 KiB — 25 ms — h3https://bitcoin.org/img/icons/ico_business.svg?1776683281/img/icons/ico_business.svg?1776683... https://bitcoin.org/img/icons/ico_business.svg?1776683281 — 200 — 1.7 KiB — 24 ms — h3https://bitcoin.org/img/icons/ico_developers.svg?1776683281/img/icons/ico_developers.svg?17766... https://bitcoin.org/img/icons/ico_developers.svg?1776683281 — 200 — 2.1 KiB — 23 ms — h3https://bitcoin.org/img/icons/ico_arrow_down.svg?1776683281/img/icons/ico_arrow_down.svg?17766... https://bitcoin.org/img/icons/ico_arrow_down.svg?1776683281 — 200 — 1.3 KiB — 28 ms — h3https://bitcoin.org/img/icons/main_ico_instant.svg?1776683281/img/icons/main_ico_instant.svg?177... https://bitcoin.org/img/icons/main_ico_instant.svg?1776683281 — 200 — 1.3 KiB — 31 ms — h3https://bitcoin.org/img/icons/main_ico_worldwide.svg?1776683281/img/icons/main_ico_worldwide.svg?1... https://bitcoin.org/img/icons/main_ico_worldwide.svg?1776683281 — 200 — 3.7 KiB — 23 ms — h3https://bitcoin.org/img/icons/main_ico_lowfee.svg?1776683281/img/icons/main_ico_lowfee.svg?1776... https://bitcoin.org/img/icons/main_ico_lowfee.svg?1776683281 — 200 — 2.5 KiB — 31 ms — h3https://bitcoin.org/img/icons/logo-footer.svg?1776683281/img/icons/logo-footer.svg?17766832... https://bitcoin.org/img/icons/logo-footer.svg?1776683281 — 200 — 6.2 KiB — 31 ms — h3https://bitcoin.org/js/analytics.js/js/analytics.js https://bitcoin.org/js/analytics.js — 200 — 934 B — 31 ms — h3https://bitcoin.org/json/hungry.json/json/hungry.json https://bitcoin.org/json/hungry.json — 200 — 30.5 KiB — 970 ms — h3https://bitcoin.org/json/hungry.json/json/hungry.json https://bitcoin.org/json/hungry.json — 200 — 0 B — 970 ms — h3https://bitcoin.org/json/flower_heads.json/json/flower_heads.json https://bitcoin.org/json/flower_heads.json — 200 — 304.1 KiB — 6.1 s — h3https://bitcoin.org/json/flower_heads.json/json/flower_heads.json https://bitcoin.org/json/flower_heads.json — 200 — 0 B — 6.1 s — h3https://bitcoin.org/json/fairy.json/json/fairy.json https://bitcoin.org/json/fairy.json — 200 — 64.0 KiB — 2.6 s — h3https://bitcoin.org/json/fairy.json/json/fairy.json https://bitcoin.org/json/fairy.json — 200 — 0 B — 2.6 s — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 2.5 s LCP 5.1 shttps://bitcoin.org// https://bitcoin.org/ — 302 — 556 B — 214 ms — h2https://bitcoin.org/en//en/ https://bitcoin.org/en/ — 200 — 6.1 KiB — 171 ms — h2https://bitcoin.org/css/font-awesome-4.4.0/css/font-awesome.min.css/css/font-awesome-4.4.0/css/font-aw... https://bitcoin.org/css/font-awesome-4.4.0/css/font-awesome.min.css — 200 — 6.5 KiB — 78 ms — h3https://bitcoin.org/css/main.css?1776683281/css/main.css?1776683281 https://bitcoin.org/css/main.css?1776683281 — 200 — 22.5 KiB — 102 ms — h3https://bitcoin.org/js/base.js?1776683281/js/base.js?1776683281 https://bitcoin.org/js/base.js?1776683281 — 200 — 4.5 KiB — 74 ms — h3https://bitcoin.org/js/main.js?1776683281/js/main.js?1776683281 https://bitcoin.org/js/main.js?1776683281 — 200 — 8.8 KiB — 88 ms — h3https://bitcoin.org/js/lottie-player.js?1776683281/js/lottie-player.js?1776683281 https://bitcoin.org/js/lottie-player.js?1776683281 — 200 — 96.2 KiB — 121 ms — h3https://bitcoin.org/js/jquery/jquery-1.11.2.min.js/js/jquery/jquery-1.11.2.min.js https://bitcoin.org/js/jquery/jquery-1.11.2.min.js — 200 — 33.0 KiB — 112 ms — h3https://bitcoin.org/js/jquery/jquery-ui.min.js/js/jquery/jquery-ui.min.js https://bitcoin.org/js/jquery/jquery-ui.min.js — 200 — 63.2 KiB — 119 ms — h3https://bitcoin.org/js/jquery/jquery.qrcode.min.js/js/jquery/jquery.qrcode.min.js https://bitcoin.org/js/jquery/jquery.qrcode.min.js — 200 — 5.2 KiB — 85 ms — h3https://bitcoin.org/js/cookieconsent/cookieconsent.js?1776683281/js/cookieconsent/cookieconsent.js?... https://bitcoin.org/js/cookieconsent/cookieconsent.js?1776683281 — 200 — 3.7 KiB — 82 ms — h3https://bitcoin.org/img/icons/ico_close.svg?1776683281/img/icons/ico_close.svg?1776683281 https://bitcoin.org/img/icons/ico_close.svg?1776683281 — 200 — 1.1 KiB — 70 ms — h3https://bitcoin.org/img/icons/logotop.svg?1776683281/img/icons/logotop.svg?1776683281 https://bitcoin.org/img/icons/logotop.svg?1776683281 — 200 — 3.4 KiB — 79 ms — h3https://bitcoin.org/img/animations/herecomesbitcoin/hungry_right_hand.svg?1776683281/img/animations/herecomesbitcoin/hu... https://bitcoin.org/img/animations/herecomesbitcoin/hungry_right_hand.svg?1776683281 — 200 — 2.0 KiB — 28 ms — h3https://bitcoin.org/img/animations/herecomesbitcoin/hungry_left_hand.svg?1776683281/img/animations/herecomesbitcoin/hu... https://bitcoin.org/img/animations/herecomesbitcoin/hungry_left_hand.svg?1776683281 — 200 — 1.9 KiB — 30 ms — h3https://bitcoin.org/img/icons/ico_individuals.svg?1776683281/img/icons/ico_individuals.svg?1776... https://bitcoin.org/img/icons/ico_individuals.svg?1776683281 — 200 — 1.7 KiB — 25 ms — h3https://bitcoin.org/img/icons/ico_business.svg?1776683281/img/icons/ico_business.svg?1776683... https://bitcoin.org/img/icons/ico_business.svg?1776683281 — 200 — 1.7 KiB — 24 ms — h3https://bitcoin.org/img/icons/ico_developers.svg?1776683281/img/icons/ico_developers.svg?17766... https://bitcoin.org/img/icons/ico_developers.svg?1776683281 — 200 — 2.1 KiB — 23 ms — h3https://bitcoin.org/img/icons/ico_arrow_down.svg?1776683281/img/icons/ico_arrow_down.svg?17766... https://bitcoin.org/img/icons/ico_arrow_down.svg?1776683281 — 200 — 1.3 KiB — 28 ms — h3https://bitcoin.org/img/icons/main_ico_instant.svg?1776683281/img/icons/main_ico_instant.svg?177... https://bitcoin.org/img/icons/main_ico_instant.svg?1776683281 — 200 — 1.3 KiB — 31 ms — h3https://bitcoin.org/img/icons/main_ico_worldwide.svg?1776683281/img/icons/main_ico_worldwide.svg?1... https://bitcoin.org/img/icons/main_ico_worldwide.svg?1776683281 — 200 — 3.7 KiB — 23 ms — h3https://bitcoin.org/img/icons/main_ico_lowfee.svg?1776683281/img/icons/main_ico_lowfee.svg?1776... https://bitcoin.org/img/icons/main_ico_lowfee.svg?1776683281 — 200 — 2.5 KiB — 31 ms — h3https://bitcoin.org/img/icons/logo-footer.svg?1776683281/img/icons/logo-footer.svg?17766832... https://bitcoin.org/img/icons/logo-footer.svg?1776683281 — 200 — 6.2 KiB — 31 ms — h3https://bitcoin.org/js/analytics.js/js/analytics.js https://bitcoin.org/js/analytics.js — 200 — 934 B — 31 ms — h3https://bitcoin.org/json/hungry.json/json/hungry.json https://bitcoin.org/json/hungry.json — 200 — 30.5 KiB — 970 ms — h3https://bitcoin.org/json/hungry.json/json/hungry.json https://bitcoin.org/json/hungry.json — 200 — 0 B — 970 ms — h3https://bitcoin.org/json/flower_heads.json/json/flower_heads.json https://bitcoin.org/json/flower_heads.json — 200 — 304.1 KiB — 6.1 s — h3https://bitcoin.org/json/flower_heads.json/json/flower_heads.json https://bitcoin.org/json/flower_heads.json — 200 — 0 B — 6.1 s — h3https://bitcoin.org/json/fairy.json/json/fairy.json https://bitcoin.org/json/fairy.json — 200 — 64.0 KiB — 2.6 s — h3https://bitcoin.org/json/fairy.json/json/fairy.json https://bitcoin.org/json/fairy.json — 200 — 0 B — 2.6 s — h3https://bitcoin.org/json/cat.json/json/cat.json https://bitcoin.org/json/cat.json — 200 — 71.2 KiB — 2.3 s — h3https://bitcoin.org/json/cat.json/json/cat.json https://bitcoin.org/json/cat.json — 200 — 0 B — 2.3 s — h3https://bitcoin.org/img/icons/menumobile.svg?1528322191/img/icons/menumobile.svg?152832219... https://bitcoin.org/img/icons/menumobile.svg?1528322191 — 200 — 1.1 KiB — 24 ms — h3https://bitcoin.org/img/hero/overview-bg-repeat.png/img/hero/overview-bg-repeat.png https://bitcoin.org/img/hero/overview-bg-repeat.png — 200 — 104.9 KiB — 37 ms — h3https://bitcoin.org/img/hero/footer-bg.svg?1528322191/img/hero/footer-bg.svg?1528322191 https://bitcoin.org/img/hero/footer-bg.svg?1528322191 — 200 — 1.4 KiB — 36 ms — h3https://bitcoin.org/img/icons/netstatus_normal.svg?1528322191/img/icons/netstatus_normal.svg?152... https://bitcoin.org/img/icons/netstatus_normal.svg?1528322191 — 200 — 856 B — 35 ms — h3https://bitcoin.org/font/titillium/TitilliumWeb-Regular.woff2/font/titillium/TitilliumWeb-Regula... https://bitcoin.org/font/titillium/TitilliumWeb-Regular.woff2 — 200 — 22.3 KiB — 30 ms — h3https://bitcoin.org/font/titillium/TitilliumWeb-SemiBold.woff2/font/titillium/TitilliumWeb-SemiBo... https://bitcoin.org/font/titillium/TitilliumWeb-SemiBold.woff2 — 200 — 22.1 KiB — 27 ms — h3https://bitcoin.org/font/titillium/TitilliumWeb-Bold.woff2/font/titillium/TitilliumWeb-Bold.w... https://bitcoin.org/font/titillium/TitilliumWeb-Bold.woff2 — 200 — 20.9 KiB — 28 ms — h3https://bitcoin.org/cdn-cgi/trace/cdn-cgi/trace https://bitcoin.org/cdn-cgi/trace — 200 — 675 B — 20 ms — h3https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 111 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1999343812&t=pageview&_s=1&dl=https%3A%2F%2Fbitcoin.org%2Fen%2F&ul=en-us&dt=Bitcoin%20-%20Open%20source%20P2P%20money&sr=412x823&vp=412x823&_u=IEBAAEABAAAAACAAI~&jid=917100266&gjid=139478091&cid=1403080664.1776806654&tid=UA-170755108-1&_gid=932819912.1776806654&_r=1&_slc=1&z=275469110www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1999343812&t=pageview&_s=1&dl=https%3A%2F%2Fbitcoin.org%2Fen%2F&ul=en-us&dt=Bitcoin%20-%20Open%20source%20P2P%20money&sr=412x823&vp=412x823&_u=IEBAAEABAAAAACAAI~&jid=917100266&gjid=139478091&cid=1403080664.1776806654&tid=UA-170755108-1&_gid=932819912.1776806654&_r=1&_slc=1&z=275469110 — 200 — 462 B — 25 ms — h2https://bitcoin.org/js/cookieconsent/light-floating.css/js/cookieconsent/light-floating.cs... https://bitcoin.org/js/cookieconsent/light-floating.css — 200 — 1.5 KiB — 23 ms — h3https://bitcoin.org/favicon.png?1776683281/favicon.png?1776683281 https://bitcoin.org/favicon.png?1776683281 — 200 — 1.8 KiB — 24 ms — h3https://www.googletagmanager.com/gtag/js?id=G-G6FD47421W&cx=c&_slc=1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-G6FD47421W&cx=c&_slc=1 — -1 — 0 B — 0 ms —
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
11% of JavaScript execution is third-party
First-party Third-party 723ms · 21KB · €8/mo
Unattributable
Other
Costly
Execution 665ms
Transfer 0 KB
Monthly Cost €7/mo
Google Analytics
Analytics
Optional
Execution 58ms
Transfer 21 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 665ms and costs ~€7/month

Unattributable takes 665ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback