Skip to content
https://brew.sh

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
1
REVIEW
1
PASS
11
INFO
1

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

Mobile Desktop
100
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.

435 ms

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

499 ms

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.

0.011

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

435 ms

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

499 ms

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
14
11 PASS 1 REVIEW 1 FIX
D
Third-Party Impact
Action
72% third-party, 0 ms blocking
FIX
72% third-party, 0 ms blocking
Warning::
Third-party code accounts for 72% of page weight (36.8 KiB of 51.3 KiB)
Info::
Third-party blocking time is low (0 ms)
28%
72%
First-party Third-party
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
51 KB transferred, 8 requests
PASS
51 KB transferred, 8 requests
Info::
Page weighs 192 KB (51 KB transferred)
Info::
8 HTTP requests
Info::
Estimated 0.01 g CO2 per page load
51 KB / 2.4 MB budget
51 KB transferred
8 requests
0.01 g CO2 per page load
JavaScript 33.5 KiB 65%
CSS 7.1 KiB 14%
HTML 5.7 KiB 11%
Images 5.1 KiB 10%
Other 0 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
Image Optimization
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 5 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
82ms total JS execution
PASS
82ms total JS execution
Info::
https://brew.sh/: 82ms CPU time

Main Thread Breakdown

Style & Layout 44% Other 27% Script Evaluation 14% Script Parsing & Compilation 6% Rendering 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://brew.sh/82ms10ms0ms1st
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
2 scripts, 25 KB unused
PASS
2 scripts, 25 KB unused
Warning::
https://cdnjs.cloudflare.com/ajax/libs/docsearch-j...: 25 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 25 KB
25 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdnjs.cloudflare.com/ajax/libs/docsearch-js/3.9.0/umd/index.min.js31 KB25 KB (83%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/anchor-js/5.0.0/anchor.min.js3 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
8 resources · 51 KB · 25 KB savings available
PASS
8 resources · 51 KB · 25 KB savings available
Info::
Within 1MB page-weight target
Got: 51 KB
Warning::
3 third-party resources (72% of weight)
8 resources · 51.3 KiB · 3 third-party Within 1MB page-weight target
JavaScript 65% · 33.5 KiB
CSS 14% · 7.1 KiB
Document 11% · 5.7 KiB
Image 10% · 5.1 KiB

~25.1 KiB of savings available

Remove unused JavaScript: 25.1 KiB
A+
HTTP Caching
max-age=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: max-age=600
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=600

DirectiveValueMeaning
max-age600Cache for 10 minutes
Effective TTL: 600 seconds
Network Waterfall
8 requests over 141ms
INFO
0 ms 200 ms 400 ms FCP 435 ms LCP 499 mshttps://brew.sh// https://brew.sh/ — 200 — 5.7 KiB — 20 ms — h2https://brew.sh/assets/css/style.css/assets/css/style.css https://brew.sh/assets/css/style.css — 200 — 3.8 KiB — 8 ms — h2https://cdnjs.cloudflare.com/ajax/libs/docsearch-css/3.9.0/style.min.csscdnjs.cloudflare.com/ajax/libs/docs... https://cdnjs.cloudflare.com/ajax/libs/docsearch-css/3.9.0/style.min.css — 200 — 3.3 KiB — 31 ms — h3https://brew.sh/assets/img/homebrew.svg/assets/img/homebrew.svg https://brew.sh/assets/img/homebrew.svg — 200 — 1.8 KiB — 12 ms — h2https://brew.sh/assets/img/forkme_right_gray_6d6d6d.svg/assets/img/forkme_right_gray_6d6d6... https://brew.sh/assets/img/forkme_right_gray_6d6d6d.svg — 200 — 3.3 KiB — 8 ms — h2https://cdnjs.cloudflare.com/ajax/libs/anchor-js/5.0.0/anchor.min.jscdnjs.cloudflare.com/ajax/libs/anch... https://cdnjs.cloudflare.com/ajax/libs/anchor-js/5.0.0/anchor.min.js — 200 — 2.8 KiB — 22 ms — h3https://cdnjs.cloudflare.com/ajax/libs/docsearch-js/3.9.0/umd/index.min.jscdnjs.cloudflare.com/ajax/libs/docs... https://cdnjs.cloudflare.com/ajax/libs/docsearch-js/3.9.0/umd/index.min.js — 200 — 30.7 KiB — 22 ms — h3https://brew.sh/assets/img/homebrew.svg/assets/img/homebrew.svg https://brew.sh/assets/img/homebrew.svg — 200 — 0 B — 2 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback