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Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
8
PASS
10
INFO
4

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

Mobile Desktop
28
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

4.07 s

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

16.60 s

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

6.84 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.

9.56 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.

33.03 s

Page Load Progression

650 ms
1.3 s
1.9 s
2.6 s
3.2 s
3.9 s
4.5 s
5.2 s
Checks
27
10 PASS 8 REVIEW 5 FIX
F
Page Weight Budget
Action
4.4 MB transferred, 147 requests
FIX
4.4 MB transferred, 147 requests
Critical::
Page weighs 13.4 MB (4.4 MB transferred)
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Info::
CSS is 279 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 279 KB
Info::
Fonts are 251 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 251 KB
Warning::
147 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
147 requests
0.92 g CO2 per page load
JavaScript 1.7 MiB 39%
Images 1.2 MiB 28%
Other 807.0 KiB 18%
CSS 278.5 KiB 6%
Fonts 251.5 KiB 6%
HTML 128.7 KiB 3%
Other 17.1 KiB 0%
Other 4.4 KiB 0%
Other 941 B 0%
Other 429 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
97% third-party, 0 ms blocking
FIX
97% third-party, 0 ms blocking
Warning::
Third-party code accounts for 97% of page weight (4.3 MiB of 4.4 MiB)
Info::
Third-party blocking time is low (0 ms)
97%
First-party Third-party
F
JS Execution Cost
Action
19430ms total JS execution
FIX
19430ms total JS execution
Warning::
https://github.githubassets.com/assets/chunk-39118...: 8293ms CPU time
Warning::
https://github.com/: 2941ms CPU time
Warning::
https://github.githubassets.com/assets/react-lib-1...: 2790ms CPU time
Warning::
https://github.githubassets.com/assets/46752-7bd89...: 1201ms CPU time
Warning::
Unattributable: 1121ms CPU time
Warning::
Third-party scripts: 16489ms (85% of total)

Main Thread Breakdown

Other 51% Script Evaluation 22% Style & Layout 19% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://github.githubassets.com/assets/chunk-39118-635712f2ef75199c.js8293ms228ms4ms3rd
https://github.com/2941ms13ms1ms1st
https://github.githubassets.com/assets/react-lib-1353f2cef82bcdc0.js2790ms2099ms35ms3rd
https://github.githubassets.com/assets/46752-7bd8967216f7ea42.js1201ms257ms7ms3rd
Unattributable1121ms101ms0ms3rd
https://github.githubassets.com/assets/landing-pages-29d9816a92404e81.js852ms597ms254ms3rd
https://github.githubassets.com/assets/behaviors-d9f0cee1f9e3eb0f.js567ms190ms22ms3rd
https://github.githubassets.com/assets/environment-8e8857b66d545299.js473ms77ms18ms3rd
https://github.githubassets.com/assets/22445-604e65e2ca54f03d.js356ms4ms2ms3rd
https://github.githubassets.com/assets/81058-fc9ccbdd06141af8.js338ms235ms9ms3rd

Showing top 10 of 18 scripts

F
JS Bundles
Action
94 scripts, 788 KB unused
FIX
94 scripts, 788 KB unused
Warning::
https://github.githubassets.com/assets/landing-pag...: 409 KB unused (93%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://github.githubassets.com/assets/primer-reac...: 67 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://github.githubassets.com/assets/react-lib-1...: 51 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://github.githubassets.com/assets/48761-e0d70...: 48 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://github.githubassets.com/assets/react-core-...: 46 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 788 KB
788 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://github.githubassets.com/assets/landing-pages-29d9816a92404e81.js438 KB409 KB (93%)✓3rd
https://github.githubassets.com/assets/primer-react-0eccd57ee759dfd8.js123 KB67 KB (55%)✓3rd
https://github.githubassets.com/assets/react-lib-1353f2cef82bcdc0.js88 KB51 KB (59%)✓3rd
https://github.githubassets.com/assets/48761-e0d707ef4ac523be.js114 KB48 KB (42%)✓3rd
https://github.githubassets.com/assets/react-core-b2929a643e0ecc05.js66 KB46 KB (70%)✓3rd
https://github.githubassets.com/assets/behaviors-d9f0cee1f9e3eb0f.js54 KB44 KB (81%)✓3rd
https://github.githubassets.com/assets/37826-36074ccbdf2fd58c.js59 KB43 KB (74%)✓3rd
https://github.githubassets.com/assets/70641-df7d286b6e757eb5.js102 KB33 KB (32%)✓3rd
https://github.githubassets.com/assets/63050-9f22093e0909629c.js28 KB24 KB (88%)✓3rd
https://github.githubassets.com/assets/67466-79abcbf599986a00.js31 KB23 KB (77%)✓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
147 resources · 4.4 MB · 788 KB savings available
FIX
147 resources · 4.4 MB · 788 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::
~788 KB of savings available
Warning::
145 third-party resources (97% of weight)
Info::
5 resources over 200KB
147 resources · 4.4 MiB · 145 third-party 3.4 MiB over 1MB target
JavaScript 39% · 1.7 MiB
Image 28% · 1.2 MiB
Other 18% · 812.4 KiB
CSS 6% · 278.5 KiB
Font 6% · 251.5 KiB
Document 3% · 128.7 KiB
Media 0% · 429 B

~788.4 KiB of savings available

Remove unused JavaScript: 788.4 KiB
C
Image Optimization
Action
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://images.ctfassets.net/8aevphvgewt8/g1XhuDG7... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/8aevphvgewt8/6Qr8Snm4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 1.2 MB
0 oversized -0 KB
14 legacy format
2 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

B
Resource Hints
8 hints, 0 missing preconnects
REVIEW
8 hints, 0 missing preconnects
Warning::
1 font preload(s) missing `crossorigin` -- font will be downloaded twice
Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: https://github.githubassets.com/assets/MonaSansVF-wdth-wght-opsz-902d64c7ad02.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.
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 8 resource hint(s)

Current Resource Hints

preconnect
2
preload
2
dns-prefetch
4
prefetch
—

8 resource hints configured

Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: https://github.githubassets.com/assets/MonaSansVF-wdth-wght-opsz-902d64c7ad02.woff2. Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.

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.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
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.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
7 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
Total JS execution time is 19.4 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.
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 (251 KB)
PASS
2 fonts (251 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

251 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 FCP 4.1 s LCP 16.6 shttps://github.githubassets.com/assets/MonaSansVF-wdth-wght-opsz-902d64c7ad02.woff2MonaSansVF-wdth-wght-op... https://github.githubassets.com/assets/MonaSansVF-wdth-wght-opsz-902d64c7ad02.woff2 — 214.6 KiB — 128 ms — font-display: swaphttps://github.githubassets.com/assets/MonaSansMonoVF-wght-04a1e3036ddf.woff2MonaSansMonoVF-wght-04a... https://github.githubassets.com/assets/MonaSansMonoVF-wght-04a1e3036ddf.woff2 — 36.9 KiB — 13 ms — font-display: swap
MonaSansVF-wdth-wght-op... woff2 swap
Size 215 KB
Load time 128 ms
Start 85 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-04a... woff2 swap
Size 37 KB
Load time 13 ms
Start 582 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+
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, Accept-Lan...
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
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
20 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
147 requests over 2617ms
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 FCP 4.1 s LCP 16.6 shttps://github.com// https://github.com/ — 200 — 128.7 KiB — 185 ms — h2https://github.githubassets.com/assets/global-banner-disable-7f8c9b12bd1db3c7.jsgithub.githubassets.com/assets/glob... https://github.githubassets.com/assets/global-banner-disable-7f8c9b12bd1db3c7.js — 200 — 656 B — 107 ms — h2https://github.githubassets.com/assets/MonaSansVF-wdth-wght-opsz-902d64c7ad02.woff2github.githubassets.com/assets/Mona... https://github.githubassets.com/assets/MonaSansVF-wdth-wght-opsz-902d64c7ad02.woff2 — 200 — 214.6 KiB — 128 ms — h2https://github.githubassets.com/assets/light-2ff56e1b36116ee2.cssgithub.githubassets.com/assets/ligh... https://github.githubassets.com/assets/light-2ff56e1b36116ee2.css — 200 — 6.5 KiB — 58 ms — h2https://github.githubassets.com/assets/light_high_contrast-f7f95d7633592089.cssgithub.githubassets.com/assets/ligh... https://github.githubassets.com/assets/light_high_contrast-f7f95d7633592089.css — 200 — 6.9 KiB — 58 ms — h2https://github.githubassets.com/assets/dark-2d1fe43dbc9adf1f.cssgithub.githubassets.com/assets/dark... https://github.githubassets.com/assets/dark-2d1fe43dbc9adf1f.css — 200 — 6.6 KiB — 58 ms — h2https://github.githubassets.com/assets/dark_high_contrast-d530ee188d165539.cssgithub.githubassets.com/assets/dark... https://github.githubassets.com/assets/dark_high_contrast-d530ee188d165539.css — 200 — 6.7 KiB — 57 ms — h2https://github.githubassets.com/assets/primer-primitives-7f694b60439d06c0.cssgithub.githubassets.com/assets/prim... https://github.githubassets.com/assets/primer-primitives-7f694b60439d06c0.css — 200 — 2.3 KiB — 82 ms — h2https://github.githubassets.com/assets/primer-b48faa60c69660fa.cssgithub.githubassets.com/assets/prim... https://github.githubassets.com/assets/primer-b48faa60c69660fa.css — 200 — 42.3 KiB — 117 ms — h2https://github.githubassets.com/assets/global-81a5f61ff87ac6f0.cssgithub.githubassets.com/assets/glob... https://github.githubassets.com/assets/global-81a5f61ff87ac6f0.css — 200 — 40.4 KiB — 109 ms — h2https://github.githubassets.com/assets/github-f825c0edd7ad57f8.cssgithub.githubassets.com/assets/gith... https://github.githubassets.com/assets/github-f825c0edd7ad57f8.css — 200 — 23.8 KiB — 118 ms — h2https://github.githubassets.com/assets/site-8e580c38ab6535be.cssgithub.githubassets.com/assets/site... https://github.githubassets.com/assets/site-8e580c38ab6535be.css — 200 — 82.3 KiB — 120 ms — h2https://github.githubassets.com/assets/landing-pages-270babc3e592e1db.cssgithub.githubassets.com/assets/land... https://github.githubassets.com/assets/landing-pages-270babc3e592e1db.css — 200 — 439 B — 81 ms — h2https://github.githubassets.com/assets/home-b65ad196250a1364.cssgithub.githubassets.com/assets/home... https://github.githubassets.com/assets/home-b65ad196250a1364.css — 200 — 8.4 KiB — 23 ms — h2https://github.githubassets.com/assets/high-contrast-cookie-218067197ba03c91.jsgithub.githubassets.com/assets/high... https://github.githubassets.com/assets/high-contrast-cookie-218067197ba03c91.js — 200 — 1002 B — 102 ms — h2https://github.githubassets.com/assets/react-core.0c5a60be620dab14.module.cssgithub.githubassets.com/assets/reac... https://github.githubassets.com/assets/react-core.0c5a60be620dab14.module.css — 200 — 696 B — 98 ms — h2https://github.githubassets.com/assets/primer-react-css.48c74afb1f96b5a7.module.cssgithub.githubassets.com/assets/prim... https://github.githubassets.com/assets/primer-react-css.48c74afb1f96b5a7.module.css — 200 — 32.4 KiB — 48 ms — h2https://github.githubassets.com/assets/landing-pages.95e52e4789131d48.module.cssgithub.githubassets.com/assets/land... https://github.githubassets.com/assets/landing-pages.95e52e4789131d48.module.css — 200 — 12.9 KiB — 68 ms — 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— 200 — 36.9 KiB — 13 ms — h3https://github.githubassets.com/assets/chunk-59113-bc348ccf69899420.jsgithub.githubassets.com/assets/chun... https://github.githubassets.com/assets/chunk-59113-bc348ccf69899420.js — 200 — 15.5 KiB — 7 ms — h3https://github.githubassets.com/assets/chunk-30351-5fcfb220736f87f5.jsgithub.githubassets.com/assets/chun... https://github.githubassets.com/assets/chunk-30351-5fcfb220736f87f5.js — 200 — 2.3 KiB — 20 ms — h3https://github.githubassets.com/assets/chunk-51591-229ee60bc70d7c87.jsgithub.githubassets.com/assets/chun... https://github.githubassets.com/assets/chunk-51591-229ee60bc70d7c87.js — 200 — 6.1 KiB — 41 ms — h3https://github.githubassets.com/assets/chunk-34877-047dcfe658f78da5.jsgithub.githubassets.com/assets/chun... https://github.githubassets.com/assets/chunk-34877-047dcfe658f78da5.js — 200 — 824 B — 66 ms — h3https://github.githubassets.com/assets/chunk-36423-2d27fe5fc21d0521.jsgithub.githubassets.com/assets/chun... 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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
85% of JavaScript execution is third-party
First-party Third-party 16489ms · 1071KB · $219/mo
github.githubassets.com
Other
Costly
Execution 8293ms
Transfer 10 KB
Monthly Cost $110/mo
github.githubassets.com
Other
Costly
Execution 2790ms
Transfer 88 KB
Unused 59%
Monthly Cost $37/mo
github.githubassets.com
Other
Costly
Execution 1201ms
Transfer 26 KB
Monthly Cost $16/mo
Unattributable
Other
Costly
Execution 1121ms
Transfer 0 KB
Monthly Cost $15/mo
github.githubassets.com
Other
Costly
Execution 852ms
Transfer 438 KB
Unused 93%
Monthly Cost $11/mo
github.githubassets.com
Other
Costly
Execution 567ms
Transfer 54 KB
Unused 81%
Monthly Cost $8/mo
github.githubassets.com
Other
Costly
Execution 473ms
Transfer 7 KB
Monthly Cost $6/mo
github.githubassets.com
Other
Costly
Execution 356ms
Transfer 6 KB
Monthly Cost $5/mo
github.githubassets.com
Other
Costly
Execution 338ms
Transfer 9 KB
Monthly Cost $4/mo
github.githubassets.com
Other
Optional
Execution 82ms
Transfer 11 KB
Monthly Cost $1/mo
github.githubassets.com
Other
Optional
Execution 78ms
Transfer 16 KB
Monthly Cost $1/mo
github.githubassets.com
Other
Optional
Execution 66ms
Transfer 123 KB
Unused 55%
Monthly Cost $1/mo
github.githubassets.com
Other
Optional
Execution 61ms
Transfer 18 KB
Monthly Cost $1/mo
github.githubassets.com
Other
Optional
Execution 57ms
Transfer 18 KB
Monthly Cost $1/mo
github.githubassets.com
Other
Optional
Execution 54ms
Transfer 114 KB
Unused 42%
Monthly Cost $1/mo
github.githubassets.com
Other
Optional
Execution 51ms
Transfer 102 KB
Unused 32%
Monthly Cost $1/mo
github.githubassets.com
Other
Optional
Execution 50ms
Transfer 31 KB
Unused 77%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • github.githubassets.com adds 8293ms and costs ~$110/month
  • github.githubassets.com adds 2790ms and costs ~$37/month
  • github.githubassets.com adds 1201ms and costs ~$16/month
  • Unattributable adds 1121ms and costs ~$15/month
  • github.githubassets.com adds 852ms and costs ~$11/month
  • github.githubassets.com adds 567ms and costs ~$8/month
  • github.githubassets.com adds 473ms and costs ~$6/month
  • github.githubassets.com adds 356ms and costs ~$5/month
  • github.githubassets.com adds 338ms and costs ~$4/month

85% 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 8293ms 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 2790ms 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

59% 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 1201ms 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 1121ms 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 852ms 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

93% 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 567ms 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 473ms 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 356ms 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 338ms 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

55% 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

77% 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 (2026-04-11 — 2026-05-08)

LCP (p75)

2311 ms

78% good

INP (p75)

75 ms

92% good

CLS (p75)

0.080

84% good

FCP (p75)

1516 ms

TTFB (p75)

1112 ms

This origin passes Core Web Vitals assessment
Image Optimization
24 images, 101 KB total, 93 KB wasted
INFO

Image Optimization Audit

Total Images

24

Total Size

101 KB

Oversized

3

Wasted

93 KB

17 missing alt text 24 missing dimensions
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