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Performance

· 24 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
6
PASS
9
INFO
4

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

Mobile Desktop
37
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.

1.93 s

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

4.38 s

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

743 ms

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

0.010

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

3.15 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.

4.55 s

Page Load Progression

747 ms
1.5 s
2.2 s
3.0 s
3.7 s
4.5 s
5.2 s
6.0 s
Checks
24
9 PASS 6 REVIEW 5 FIX
F
Page Weight Budget
Action
4.4 MB transferred, 126 requests
FIX
4.4 MB transferred, 126 requests
Critical::
Page weighs 12.8 MB (4.4 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 1.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.7 MB
Info::
CSS is 307 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 307 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::
126 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.92 g CO2 per page load
4.4 MB / 2.4 MB budget
4.4 MB transferred
126 requests
0.92 g CO2 per page load
JavaScript 1.8 MiB 40%
Images 1.7 MiB 40%
CSS 306.5 KiB 7%
Fonts 251.5 KiB 6%
Other 218.0 KiB 5%
HTML 95.4 KiB 2%
Other 17.2 KiB 0%
Other 5.0 KiB 0%
Other 1.1 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 (4.3 MiB of 4.4 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
F
JS Execution Cost
Action
4694ms total JS execution
FIX
4694ms total JS execution
Warning::
https://github.githubassets.com/assets/a3k-2bc86f1...: 2113ms CPU time
Warning::
https://github.com/: 766ms CPU time
Warning::
https://github.githubassets.com/assets/react-dom-c...: 487ms CPU time
Warning::
https://github.githubassets.com/assets/landing-pag...: 398ms CPU time
Warning::
Unattributable: 279ms CPU time
Warning::
Third-party scripts: 3650ms (78% of total)

Main Thread Breakdown

Other 58% Style & Layout 20% Script Evaluation 18%
ScriptTotalScriptingParse/CompileParty
https://github.githubassets.com/assets/a3k-2bc86f11ec40300f.js2113ms58ms0ms3rd
https://github.com/766ms10ms0ms1st
https://github.githubassets.com/assets/react-dom-client-35b308126995de85.js487ms18ms0ms3rd
https://github.githubassets.com/assets/landing-pages-3820389f008f8c43.js398ms190ms0ms3rd
Unattributable279ms30ms0ms1st
https://github.githubassets.com/assets/core-2974019364a2bac7.js228ms224ms0ms3rd
https://github.githubassets.com/assets/scheduler-58b860b049ca307c.js225ms203ms0ms3rd
https://github.githubassets.com/assets/pb-25305857c53068ff.js199ms90ms1ms3rd
F
JS Bundles
Action
62 scripts, 999 KB unused
FIX
62 scripts, 999 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...: 83 KB unused (80%)
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: 999 KB
999 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 KB83 KB (80%)✓3rd
https://github.githubassets.com/assets/pb-25305857c53068ff.js105 KB83 KB (79%)✓3rd
https://github.githubassets.com/assets/react-core-71c213265931c567.js83 KB67 KB (80%)✓3rd
https://github.githubassets.com/assets/23-905aca4afd4b8552.js115 KB53 KB (46%)✓3rd
https://github.githubassets.com/assets/wgy-4f99aac04131ab70.js48 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 KB25 KB (42%)✓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
126 resources · 4.4 MB · 999 KB savings available
FIX
126 resources · 4.4 MB · 999 KB savings available
Warning::
Page weight 4.4 MB exceeds 1 MB target by 3.4 MB
Got: 4.4 MB Expected: ≤ 1 MB
Info::
~999 KB of savings available
Warning::
124 third-party resources (98% of weight)
Info::
5 resources over 200KB
126 resources · 4.4 MiB · 124 third-party 3.4 MiB over 1MB target
JavaScript 40% · 1.8 MiB
Image 40% · 1.8 MiB
CSS 7% · 306.5 KiB
Font 6% · 251.5 KiB
Other 5% · 224.1 KiB
Document 2% · 95.4 KiB
Media 0% · 462 B

~998.9 KiB of savings available

Remove unused JavaScript: 998.9 KiB
B
Image Optimization
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Info::
All images are well-optimized
23 images 1.7 MB
0 oversized -0 KB
19 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 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.9 s LCP 4.4 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 — 214.6 KiB — 138 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 — 9 ms — font-display: swap
MonaSansVF-wdth-wght-op... woff2 swap
Size 215 KB
Load time 138 ms
Start 102 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 9 ms
Start 495 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)

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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
Network Waterfall
126 requests over 5185ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.9 s LCP 4.4 shttps://github.com// https://github.com/ — 200 — 95.4 KiB — 176 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 — 87 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 — 619 B — 85 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 — 72 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 — 85 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 — 116 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 — 82 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 — 913 B — 81 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 — 101 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 — 579 B — 71 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 — 214.6 KiB — 138 ms — h2https://github.githubassets.com/assets/light-0011b1fed09cb294.cssgithub.githubassets.com/assets/ligh... https://github.githubassets.com/assets/light-0011b1fed09cb294.css — 200 — 7.3 KiB — 19 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 — 7.2 KiB — 70 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 — 71 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 — 7.5 KiB — 70 ms — h2https://github.githubassets.com/assets/primer-primitives-bd624c4ec96b42e9.cssgithub.githubassets.com/assets/prim... https://github.githubassets.com/assets/primer-primitives-bd624c4ec96b42e9.css — 200 — 2.5 KiB — 17 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 — 70 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 — 48 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 — 69 ms — h2https://github.githubassets.com/assets/marketing-d7adf5c7af320655.cssgithub.githubassets.com/assets/mark... https://github.githubassets.com/assets/marketing-d7adf5c7af320655.css — 200 — 1.2 KiB — 62 ms — h2https://github.githubassets.com/assets/home-df64966d2549e9a4.cssgithub.githubassets.com/assets/home... https://github.githubassets.com/assets/home-df64966d2549e9a4.css — 200 — 7.2 KiB — 63 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 — 774 B — 113 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 — 35.5 KiB — 128 ms — h2https://github.githubassets.com/assets/app-runtime-024413339022f51f.jsgithub.githubassets.com/assets/app-... https://github.githubassets.com/assets/app-runtime-024413339022f51f.js — 200 — 35.4 KiB — 129 ms — h2https://github.githubassets.com/assets/react-core-71c213265931c567.jsgithub.githubassets.com/assets/reac... https://github.githubassets.com/assets/react-core-71c213265931c567.js — 200 — 83.5 KiB — 149 ms — h2https://github.githubassets.com/assets/pb-25305857c53068ff.jsgithub.githubassets.com/assets/pb-2... https://github.githubassets.com/assets/pb-25305857c53068ff.js — 200 — 105.2 KiB — 172 ms — h2https://github.githubassets.com/assets/core-2974019364a2bac7.jsgithub.githubassets.com/assets/core... https://github.githubassets.com/assets/core-2974019364a2bac7.js — 200 — 103.7 KiB — 172 ms — h2https://github.githubassets.com/assets/app-runtime.c76957ef8be63051.module.cssgithub.githubassets.com/assets/app-... https://github.githubassets.com/assets/app-runtime.c76957ef8be63051.module.css — 200 — 1.2 KiB — 42 ms — h2https://github.githubassets.com/assets/react-core.5a164c98b94d898b.module.cssgithub.githubassets.com/assets/reac... https://github.githubassets.com/assets/react-core.5a164c98b94d898b.module.css — 200 — 422 B — 42 ms — h2https://github.githubassets.com/assets/marketing-essentials-4ae1a055caa707c8.jsgithub.githubassets.com/assets/mark... https://github.githubassets.com/assets/marketing-essentials-4ae1a055caa707c8.js — 200 — 2.2 KiB — 130 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.9 s LCP 4.4 shttps://github.com// https://github.com/ — 200 — 95.4 KiB — 176 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 — 87 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 — 619 B — 85 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 — 72 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 — 85 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
78% of JavaScript execution is third-party
First-party Third-party 3650ms · 899KB · €40/mo
github.githubassets.com
Other
Costly
Execution 2113ms
Transfer 26 KB
Monthly Cost €23/mo
github.githubassets.com
Other
Costly
Execution 487ms
Transfer 59 KB
Unused 42%
Monthly Cost €5/mo
github.githubassets.com
Other
Costly
Execution 398ms
Transfer 603 KB
Unused 81%
Monthly Cost €4/mo
github.githubassets.com
Other
Costly
Execution 228ms
Transfer 104 KB
Unused 80%
Monthly Cost €2/mo
github.githubassets.com
Other
Costly
Execution 225ms
Transfer 2 KB
Monthly Cost €2/mo
github.githubassets.com
Other
Optional
Execution 199ms
Transfer 105 KB
Unused 79%
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • github.githubassets.com adds 2113ms and costs ~€23/month
  • github.githubassets.com adds 487ms and costs ~€5/month
  • github.githubassets.com adds 398ms and costs ~€4/month
  • github.githubassets.com adds 228ms and costs ~€2/month
  • github.githubassets.com adds 225ms and costs ~€2/month

78% 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 2113ms 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 487ms 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 398ms 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 228ms 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

80% 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 225ms 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

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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