Skip to content
https://www.brave.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
3
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
84
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.

2.93 s

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

3.31 s

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

188 ms

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

0.066

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

2.93 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.

5.14 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
16
9 PASS 2 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 (521.3 KiB of 521.5 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2368ms total JS execution
FIX
2368ms total JS execution
Warning::
https://brave.com/js/lottie-player.f8a02068d6eea90...: 785ms CPU time
Warning::
https://brave.com/: 674ms CPU time
Warning::
Unattributable: 464ms CPU time
Warning::
https://brave.com/js/tabs.4422877367929b6c6bcf6f97...: 379ms CPU time
Info::
https://brave.com/js/navigation.dfd1f44125a1e31a3a...: 66ms CPU time
Warning::
Third-party scripts: 2368ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 29% Style & Layout 24% Garbage Collection 4%
ScriptTotalScriptingParse/CompileParty
https://brave.com/js/lottie-player.f8a02068d6eea9045634f798c4ae07cd41599d1b02684c0d700f7306f9aeca49.js785ms475ms1ms3rd
https://brave.com/674ms36ms1ms3rd
Unattributable464ms65ms0ms3rd
https://brave.com/js/tabs.4422877367929b6c6bcf6f974a9d2943058b06cf9af5f3a28847e83e24f56f9e.js379ms281ms0ms3rd
https://brave.com/js/navigation.dfd1f44125a1e31a3a0643daa3596bf331980a9e11a925abbb8231ee99e7bf40.js66ms5ms0ms3rd
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
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://brave.com/static-assets/images/brave-logo.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brave.com/static-assets/images/brave-logo-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://brave.com/home-assets/images/app-illustrat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 80 KB
0 oversized -0 KB
21 legacy format
3 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
522 KB transferred, 55 requests
PASS
522 KB transferred, 55 requests
Info::
Page weighs 2.2 MB (522 KB transferred)
Info::
55 HTTP requests
Info::
Estimated 0.11 g CO2 per page load
522 KB / 2.4 MB budget
522 KB transferred
55 requests
0.11 g CO2 per page load
JavaScript 168.3 KiB 32%
Fonts 134.5 KiB 26%
Images 79.7 KiB 15%
CSS 53.3 KiB 10%
Other 46.2 KiB 9%
HTML 22.5 KiB 4%
Other 16.6 KiB 3%
Other 363 B 0%
0 2.4 MB 4.9 MB
Under budget
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
7 fonts (134 KB)
PASS
7 fonts (134 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

134 KB total

Render-blocking

0

of 7

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 FCP 2.9 s LCP 3.3 shttps://brave.com/static-assets/fonts/FlechaM/FlechaM-Medium.woff2FlechaM-Medium.woff2 https://brave.com/static-assets/fonts/FlechaM/FlechaM-Medium.woff2 — 42.7 KiB — 0 ms — font-display: swaphttps://brave.com/static-assets/fonts/poppins/poppins-latin-600-normal.woff2poppins-latin-600-norma... https://brave.com/static-assets/fonts/poppins/poppins-latin-600-normal.woff2 — 9.0 KiB — 0 ms — font-display: swaphttps://brave.com/static-assets/fonts/poppins/poppins-latin-400-normal.woff2poppins-latin-400-norma... https://brave.com/static-assets/fonts/poppins/poppins-latin-400-normal.woff2 — 8.9 KiB — 0 ms — font-display: swaphttps://brave.com/static-assets/fonts/inter/inter-latin-wght-normal.woff2inter-latin-wght-normal... https://brave.com/static-assets/fonts/inter/inter-latin-wght-normal.woff2 — 48.5 KiB — 0 ms — font-display: swaphttps://brave.com/static-assets/fonts/poppins/poppins-latin-600-italic.woff2poppins-latin-600-itali... https://brave.com/static-assets/fonts/poppins/poppins-latin-600-italic.woff2 — 9.7 KiB — 0 ms — font-display: swaphttps://brave.com/static-assets/fonts/poppins/poppins-latin-700-normal.woff2poppins-latin-700-norma... https://brave.com/static-assets/fonts/poppins/poppins-latin-700-normal.woff2 — 8.8 KiB — 0 ms — font-display: swaphttps://brave.com/static-assets/fonts/poppins/poppins-latin-ext-400-normal.woff2poppins-latin-ext-400-n... https://brave.com/static-assets/fonts/poppins/poppins-latin-ext-400-normal.woff2 — 6.7 KiB — 0 ms — font-display: swap
FlechaM-Medium.woff2 woff2 swap
Size 43 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
poppins-latin-600-norma... woff2 swap
Size 9 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
poppins-latin-400-norma... woff2 swap
Size 9 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-wght-normal... woff2 swap
Size 49 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
poppins-latin-600-itali... woff2 swap
Size 10 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
poppins-latin-700-norma... woff2 swap
Size 9 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
poppins-latin-ext-400-n... woff2 swap
Size 7 KB
Load time 0 ms
Start 0 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+
JS Bundles
17 scripts, 21 KB unused
PASS
17 scripts, 21 KB unused
Warning::
https://brave.com/js/lottie-player.f8a02068d6eea90...: 21 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 21 KB
21 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://brave.com/js/lottie-player.f8a02068d6eea9045634f798c4ae07cd41599d1b02684c0d700f7306f9aeca49.js47 KB21 KB (47%)✓3rd
https://brave.com/js/3-delay-animations.52117dc3caa2efe969d724cfc404c3360109e18b1ae4bc3d8883cc9b85ecfae4.js1 KB—✓3rd
https://brave.com/js/5-set-download-urls.b5c47076524cf6c338c6950c01ce3274cf8c020b1b79393c504606c280171dbb.js3 KB—✓3rd
https://brave.com/static-assets/js/analysis.js3 KB—✓3rd
https://brave.com/matomo.js26 KB—✓3rd
https://brave.com/js/brave-search-widget.961e53a4365debef5ed2bac4c11380ca7396d2eb351e0a9186156a6144abaaef.js66 KB—✓3rd
https://brave.com/js/localization.eac6ebe6b760650c196b5ce8eb0033649e2db78efb2b4b36d8516f384c7a1114.min.js2 KB—✓3rd
https://brave.com/js/set-platform.a4b5c2cf36a94e5497142976e089e61ddf9a6d0c32d31f609e1372832c5f1d32.min.js2 KB—✓3rd
https://brave.com/js/card-carousel.717a7c5436ba434620e1d4b02317402f5169f01926dff3a2871663404390d1d8.js2 KB—✓3rd
https://brave.com/js/4-details-summary-animation.2b2cb643f1890d8e7d4a6ec3c0d85e5982aa58a156b2362b0d84b09841668db5.js2 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

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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
3
preload
—
dns-prefetch
—
prefetch
—

3 resource hints configured

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
Network Waterfall
55 requests over 0ms
INFO

Performance analysis not available for this result.

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 2368ms · 75KB · €7/mo
brave.com
Other
Costly
Execution 785ms
Transfer 47 KB
Unused 47%
Monthly Cost €2/mo
brave.com
Other
Costly
Execution 674ms
Transfer 23 KB
Monthly Cost €2/mo
Unattributable
Other
Costly
Execution 464ms
Transfer 0 KB
Monthly Cost €1/mo
brave.com
Other
Costly
Execution 379ms
Transfer 2 KB
Monthly Cost €1/mo
brave.com
Other
Optional
Execution 66ms
Transfer 3 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • brave.com adds 785ms and costs ~€2/month
  • brave.com adds 674ms and costs ~€2/month
  • Unattributable adds 464ms and costs ~€1/month
  • brave.com adds 379ms and costs ~€1/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

brave.com takes 785ms 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

brave.com takes 674ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

Unattributable takes 464ms 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

brave.com takes 379ms 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