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Performance

· 28 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
6
PASS
13
INFO
4

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

Mobile Desktop
25
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.
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.

12.99 s

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

19.59 s

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

5.92 s

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.

12.99 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.

23.13 s

Page Load Progression

804 ms
1.6 s
2.4 s
3.2 s
4.0 s
4.8 s
5.6 s
6.4 s
Checks
28
13 PASS 6 REVIEW 5 FIX
F
Page Weight Budget
Action
3.9 MB transferred, 122 requests
FIX
3.9 MB transferred, 122 requests
Critical::
Page weighs 12.2 MB (3.9 MB transferred)
Warning::
JavaScript is 1.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.8 MB
Warning::
Images are 1.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.3 MB
Info::
CSS is 305 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 305 KB
Info::
Fonts are 252 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 252 KB
Warning::
122 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.83 g CO2 per page load
3.9 MB / 2.4 MB budget
3.9 MB transferred
122 requests
0.83 g CO2 per page load
JavaScript 1.8 MiB 45%
Images 1.3 MiB 33%
CSS 305.4 KiB 8%
Fonts 251.7 KiB 6%
Other 218.0 KiB 5%
HTML 95.5 KiB 2%
Other 17.2 KiB 0%
Other 5.0 KiB 0%
Other 1.2 KiB 0%
Other 462 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (3.8 MiB of 3.9 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
F
JS Execution Cost
Action
18790ms total JS execution
FIX
18790ms total JS execution
Warning::
https://github.githubassets.com/assets/a3k-2bc86f1...: 9315ms CPU time
Warning::
https://github.githubassets.com/assets/landing-pag...: 2639ms CPU time
Warning::
https://github.githubassets.com/assets/react-dom-c...: 1950ms CPU time
Warning::
https://github.com/: 1307ms CPU time
Warning::
Unattributable: 1251ms CPU time
Warning::
Third-party scripts: 16232ms (86% of total)

Main Thread Breakdown

Other 63% Script Evaluation 19% Style & Layout 15%
ScriptTotalScriptingParse/CompileParty
https://github.githubassets.com/assets/a3k-2bc86f11ec40300f.js9315ms181ms0ms3rd
https://github.githubassets.com/assets/landing-pages-3820389f008f8c43.js2639ms1378ms1ms3rd
https://github.githubassets.com/assets/react-dom-client-35b308126995de85.js1950ms120ms0ms3rd
https://github.com/1307ms11ms1ms1st
Unattributable1251ms132ms0ms1st
https://github.githubassets.com/assets/pb-25305857c53068ff.js923ms442ms2ms3rd
https://github.githubassets.com/assets/scheduler-58b860b049ca307c.js918ms790ms0ms3rd
https://github.githubassets.com/assets/core-2974019364a2bac7.js437ms382ms0ms3rd
https://github.githubassets.com/assets/primer-react-brand-css.6485cac7edcdca27.module.css50ms0ms0ms3rd
F
JS Bundles
Action
62 scripts, 998 KB unused
FIX
62 scripts, 998 KB unused
Warning::
https://github.githubassets.com/assets/landing-pag...: 485 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://github.githubassets.com/assets/primer-reac...: 121 KB unused (96%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://github.githubassets.com/assets/core-297401...: 84 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://github.githubassets.com/assets/pb-25305857...: 83 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://github.githubassets.com/assets/react-core-...: 67 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 998 KB
998 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://github.githubassets.com/assets/landing-pages-3820389f008f8c43.js603 KB485 KB (81%)✓3rd
https://github.githubassets.com/assets/primer-react-76ed19f429a89450.js127 KB121 KB (96%)✓3rd
https://github.githubassets.com/assets/core-2974019364a2bac7.js104 KB84 KB (81%)✓3rd
https://github.githubassets.com/assets/pb-25305857c53068ff.js105 KB83 KB (79%)✓3rd
https://github.githubassets.com/assets/react-core-71c213265931c567.js84 KB67 KB (80%)✓3rd
https://github.githubassets.com/assets/23-905aca4afd4b8552.js115 KB53 KB (46%)✓3rd
https://github.githubassets.com/assets/wgy-4f99aac04131ab70.js47 KB33 KB (71%)✓3rd
https://github.githubassets.com/assets/k0-7b32a84784ab1163.js98 KB28 KB (29%)✓3rd
https://github.githubassets.com/assets/react-dom-client-35b308126995de85.js59 KB24 KB (41%)✓3rd
https://github.githubassets.com/assets/app-runtime-024413339022f51f.js35 KB20 KB (58%)✓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

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

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

F
Page Weight Inventory
Action
122 resources · 3.9 MB · 998 KB savings available
FIX
122 resources · 3.9 MB · 998 KB savings available
Warning::
Page weight 3.9 MB exceeds 1 MB target by 2.9 MB
Got: 3.9 MB Expected: ≤ 1 MB
Info::
~998 KB of savings available
Warning::
120 third-party resources (98% of weight)
Info::
5 resources over 200KB
122 resources · 3.9 MiB · 120 third-party 2.9 MiB over 1MB target
JavaScript 45% · 1.8 MiB
Image 33% · 1.3 MiB
CSS 8% · 305.4 KiB
Font 6% · 251.7 KiB
Other 6% · 224.3 KiB
Document 2% · 95.5 KiB
Media 0% · 462 B

~998.5 KiB of savings available

Remove unused JavaScript: 998.5 KiB
B
Image Optimization
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Info::
All images are well-optimized
20 images 1.3 MB
0 oversized -0 KB
16 legacy format
0 missing dimensions CLS risk
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document response uses gzip; brotli would be ~20% smaller
Info::
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0, private, must-revalidate
REVIEW
max-age=0, private, must-revalidate
Info::
Cache-Control header is set
Got: max-age=0, private, must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

max-age=0, private, must-revalidate

DirectiveValueMeaning
max-age0Cache for 0 seconds
private—Only browser cache, not CDN/proxy
must-revalidate—Must recheck with server after expiry
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
2 fonts (252 KB)
PASS
2 fonts (252 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

252 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 13.0 s LCP 19.6 shttps://github.githubassets.com/assets/MonaSansVF-wdth-wght-opsz-7a868ff47c93bd97.woff2MonaSansVF-wdth-wght-op... https://github.githubassets.com/assets/MonaSansVF-wdth-wght-opsz-7a868ff47c93bd97.woff2 — 214.8 KiB — 126 ms — font-display: swaphttps://github.githubassets.com/assets/MonaSansMonoVF-wght-da74d51ce1316829.woff2MonaSansMonoVF-wght-da7... https://github.githubassets.com/assets/MonaSansMonoVF-wght-da74d51ce1316829.woff2 — 36.9 KiB — 13 ms — font-display: swap
MonaSansVF-wdth-wght-op... woff2 swap
Size 215 KB
Load time 126 ms
Start 374 ms
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
MonaSansMonoVF-wght-da7... woff2 swap
Size 37 KB
Load time 13 ms
Start 1.1 s
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)

Fixing the unchecked items could save ~107 KB and ~214 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
17 hints, 0 missing preconnects
PASS
17 hints, 0 missing preconnects
Info::
2 dns-prefetch redundant with preconnect on same origin
preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://github.githubassets.com, https://avatars.githubusercontent.com. Remove the redundant dns-prefetch entries.
Info::
2 URL(s) appear in multiple hints
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://github.githubassets.com (dns-prefetch+preconnect), https://avatars.githubusercontent.com (dns-prefetch+preconnect).
Info::
Page uses 17 resource hint(s)

Current Resource Hints

preconnect
2
preload
+1
11
dns-prefetch
4
prefetch
—

17 resource hints configured

preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://github.githubassets.com, https://avatars.githubusercontent.com. Remove the redundant dns-prefetch entries.

Why this matters

Performance issues directly impact user engagement and conversion rates.

The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://github.githubassets.com (dns-prefetch+preconnect), https://avatars.githubusercontent.com (dns-prefetch+preconnect).

Why this matters

Performance issues directly impact user engagement and conversion rates.

A+
Asset Compression
All 1 asset host use brotli
PASS
All 1 asset host use brotli
Info::
github.githubassets.com serves assets with brotli (assets: 90)
Got: github.githubassets.com (text/css)
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
PASS
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: max-age=0, private, must-revalidate
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: X-PJAX, X-PJAX-Container, Turbo-Visit, Turbo-Frame, X-Requested-With, X-GitHub-C...
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
`ETag` present -- conditional GET supported
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
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
Total JS execution time is 18.8 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
A
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
34 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
Network Waterfall
122 requests over 3446ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 13.0 s LCP 19.6 shttps://github.com// https://github.com/ — 200 — 95.5 KiB — 435 ms — h2https://github.githubassets.com/assets/react-fa5e2e82e6e0ecc0.jsgithub.githubassets.com/assets/reac... https://github.githubassets.com/assets/react-fa5e2e82e6e0ecc0.js — 200 — 3.9 KiB — 107 ms — h2https://github.githubassets.com/assets/react-compiler-runtime-4610bd6d3de9c049.jsgithub.githubassets.com/assets/reac... https://github.githubassets.com/assets/react-compiler-runtime-4610bd6d3de9c049.js — 200 — 574 B — 73 ms — h2https://github.githubassets.com/assets/scheduler-58b860b049ca307c.jsgithub.githubassets.com/assets/sche... https://github.githubassets.com/assets/scheduler-58b860b049ca307c.js — 200 — 2.3 KiB — 73 ms — h2https://github.githubassets.com/assets/react-dom-c7f52540bb6b77ed.jsgithub.githubassets.com/assets/reac... https://github.githubassets.com/assets/react-dom-c7f52540bb6b77ed.js — 200 — 2.2 KiB — 112 ms — h2https://github.githubassets.com/assets/react-dom-client-35b308126995de85.jsgithub.githubassets.com/assets/reac... https://github.githubassets.com/assets/react-dom-client-35b308126995de85.js — 200 — 58.9 KiB — 124 ms — h2https://github.githubassets.com/assets/react-is-e0b593954b4706d8.jsgithub.githubassets.com/assets/reac... https://github.githubassets.com/assets/react-is-e0b593954b4706d8.js — 200 — 1.4 KiB — 108 ms — h2https://github.githubassets.com/assets/react-jsx-runtime-4915cb0f5b3aff04.jsgithub.githubassets.com/assets/reac... https://github.githubassets.com/assets/react-jsx-runtime-4915cb0f5b3aff04.js — 200 — 681 B — 107 ms — h2https://github.githubassets.com/assets/react-reconciler-8e99e505c4429605.jsgithub.githubassets.com/assets/reac... https://github.githubassets.com/assets/react-reconciler-8e99e505c4429605.js — 200 — 37.1 KiB — 117 ms — h2https://github.githubassets.com/assets/global-banner-disable-63f5ee3e1edbce73.jsgithub.githubassets.com/assets/glob... https://github.githubassets.com/assets/global-banner-disable-63f5ee3e1edbce73.js — 200 — 538 B — 106 ms — h2https://github.githubassets.com/assets/MonaSansVF-wdth-wght-opsz-7a868ff47c93bd97.woff2github.githubassets.com/assets/Mona... https://github.githubassets.com/assets/MonaSansVF-wdth-wght-opsz-7a868ff47c93bd97.woff2 — 200 — 214.8 KiB — 126 ms — h2https://github.githubassets.com/assets/light-0011b1fed09cb294.cssgithub.githubassets.com/assets/ligh... https://github.githubassets.com/assets/light-0011b1fed09cb294.css — 200 — 7.4 KiB — 36 ms — h2https://github.githubassets.com/assets/light_high_contrast-267ab2e12d3b7ade.cssgithub.githubassets.com/assets/ligh... https://github.githubassets.com/assets/light_high_contrast-267ab2e12d3b7ade.css — 200 — 7.5 KiB — 41 ms — h2https://github.githubassets.com/assets/dark-37b5e41810563d82.cssgithub.githubassets.com/assets/dark... https://github.githubassets.com/assets/dark-37b5e41810563d82.css — 200 — 7.1 KiB — 41 ms — h2https://github.githubassets.com/assets/dark_high_contrast-d69295870cb5f203.cssgithub.githubassets.com/assets/dark... https://github.githubassets.com/assets/dark_high_contrast-d69295870cb5f203.css — 200 — 7.2 KiB — 86 ms — h2https://github.githubassets.com/assets/primer-primitives-bd624c4ec96b42e9.cssgithub.githubassets.com/assets/prim... https://github.githubassets.com/assets/primer-primitives-bd624c4ec96b42e9.css — 200 — 2.3 KiB — 66 ms — h2https://github.githubassets.com/assets/primer-5e94d7f3a59af8da.cssgithub.githubassets.com/assets/prim... https://github.githubassets.com/assets/primer-5e94d7f3a59af8da.css — 200 — 42.3 KiB — 101 ms — h2https://github.githubassets.com/assets/global-159fb17d033cf67d.cssgithub.githubassets.com/assets/glob... https://github.githubassets.com/assets/global-159fb17d033cf67d.css — 200 — 38.8 KiB — 100 ms — h2https://github.githubassets.com/assets/github-d4a7053a1b3b1731.cssgithub.githubassets.com/assets/gith... https://github.githubassets.com/assets/github-d4a7053a1b3b1731.css — 200 — 21.5 KiB — 82 ms — h2https://github.githubassets.com/assets/marketing-d7adf5c7af320655.cssgithub.githubassets.com/assets/mark... https://github.githubassets.com/assets/marketing-d7adf5c7af320655.css — 200 — 1.5 KiB — 66 ms — h2https://github.githubassets.com/assets/home-df64966d2549e9a4.cssgithub.githubassets.com/assets/home... https://github.githubassets.com/assets/home-df64966d2549e9a4.css — 200 — 7.0 KiB — 84 ms — h2https://github.githubassets.com/assets/high-contrast-cookie-35ae5dee64dc5768.jsgithub.githubassets.com/assets/high... https://github.githubassets.com/assets/high-contrast-cookie-35ae5dee64dc5768.js — 200 — 987 B — 99 ms — h2https://github.githubassets.com/assets/wp-runtime-897f5f485796d6c6.jsgithub.githubassets.com/assets/wp-r... https://github.githubassets.com/assets/wp-runtime-897f5f485796d6c6.js — 200 — 35.3 KiB — 140 ms — 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h3https://github.githubassets.com/assets/tile-gradient-1-655dba6cdcef3c96.webpgithub.githubassets.com/assets/tile... https://github.githubassets.com/assets/tile-gradient-1-655dba6cdcef3c96.webp — 200 — 40.5 KiB — 6 ms — h3https://github.githubassets.com/assets/MonaSansMonoVF-wght-da74d51ce1316829.woff2github.githubassets.com/assets/Mona... https://github.githubassets.com/assets/MonaSansMonoVF-wght-da74d51ce1316829.woff2 — 200 — 36.9 KiB — 13 ms — h3https://collector.github.com/github/collectcollector.github.com/github/collect https://collector.github.com/github/collect — 503 — 309 B — 2.2 s — h2https://github.githubassets.com/favicons/favicon.svggithub.githubassets.com/favicons/fa... https://github.githubassets.com/favicons/favicon.svg — 200 — 1.3 KiB — 3 ms — h3https://github.githubassets.com/assets/apple-touch-icon-144x144-b882e354c005.pnggithub.githubassets.com/assets/appl... https://github.githubassets.com/assets/apple-touch-icon-144x144-b882e354c005.png — 200 — 14.5 KiB — 3 ms — h3https://github.githubassets.com/favicons/favicon.pnggithub.githubassets.com/favicons/fa... https://github.githubassets.com/favicons/favicon.png — 200 — 1.3 KiB — 3 ms — h3https://github.githubassets.com/assets/chunk-lazy-element-select-panel-0b80f30f7ae15b1f.jsgithub.githubassets.com/assets/chun... https://github.githubassets.com/assets/chunk-lazy-element-select-panel-0b80f30f7ae15b1f.js — 200 — 4.5 KiB — 4 ms — h3https://github.githubassets.com/assets/chunk-lazy-element-toggle-switch-10a7c55cc624165f.jsgithub.githubassets.com/assets/chun... https://github.githubassets.com/assets/chunk-lazy-element-toggle-switch-10a7c55cc624165f.js — 200 — 835 B — 14 ms — h3https://github.githubassets.com/assets/chunk-lazy-element-cookie-consent-link-8c251bfe27bbbbfc.jsgithub.githubassets.com/assets/chun... https://github.githubassets.com/assets/chunk-lazy-element-cookie-consent-link-8c251bfe27bbbbfc.js — 200 — 9.0 KiB — 14 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
86% of JavaScript execution is third-party
First-party Third-party 16232ms · 977KB · €176/mo
github.githubassets.com
Other
Costly
Execution 9315ms
Transfer 26 KB
Monthly Cost €101/mo
github.githubassets.com
Other
Costly
Execution 2639ms
Transfer 603 KB
Unused 81%
Monthly Cost €29/mo
github.githubassets.com
Other
Costly
Execution 1950ms
Transfer 59 KB
Unused 41%
Monthly Cost €21/mo
github.githubassets.com
Other
Costly
Execution 923ms
Transfer 105 KB
Unused 79%
Monthly Cost €10/mo
github.githubassets.com
Other
Costly
Execution 918ms
Transfer 2 KB
Monthly Cost €10/mo
github.githubassets.com
Other
Costly
Execution 437ms
Transfer 104 KB
Unused 81%
Monthly Cost €5/mo
github.githubassets.com
Other
Optional
Execution 50ms
Transfer 78 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • github.githubassets.com adds 9315ms and costs ~€101/month
  • github.githubassets.com adds 2639ms and costs ~€29/month
  • github.githubassets.com adds 1950ms and costs ~€21/month
  • github.githubassets.com adds 923ms and costs ~€10/month
  • github.githubassets.com adds 918ms and costs ~€10/month
  • github.githubassets.com adds 437ms and costs ~€5/month

86% 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

github.githubassets.com takes 9315ms 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

github.githubassets.com takes 2639ms 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

81% of github.githubassets.com'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

github.githubassets.com takes 1950ms 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

github.githubassets.com takes 923ms 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

79% of github.githubassets.com'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

github.githubassets.com takes 918ms 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

github.githubassets.com takes 437ms 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

81% of github.githubassets.com'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

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-10-08 — 2026-11-04)

LCP (p75)

3022 ms

67% good

INP (p75)

82 ms

91% good

CLS (p75)

0.090

78% good

FCP (p75)

2118 ms

TTFB (p75)

1552 ms

Image Optimization
22 images, 294 KB total, 9 KB wasted
INFO

Image Optimization Audit

Total Images

22

Total Size

294 KB

Oversized

2

Wasted

9 KB

9 missing dimensions 9 missing lazy loading
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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