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Performance

· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
6
PASS
8
INFO
4

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

79
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.

962 ms

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

1.83 s

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

218 ms

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.

2.15 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.

4.54 s

Page Load Progression

579 ms
1.2 s
1.7 s
2.3 s
2.9 s
3.5 s
4.0 s
4.6 s
Checks
23
8 PASS 6 REVIEW 5 FIX
F
Page Weight Budget
Action
4.4 MB transferred, 149 requests
FIX
4.4 MB transferred, 149 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::
149 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
149 requests
0.92 g CO2 per page load
JavaScript 1.7 MiB 39%
Images 1.2 MiB 28%
Other 807.1 KiB 18%
CSS 279.3 KiB 6%
Fonts 251.5 KiB 6%
HTML 128.7 KiB 3%
Other 17.2 KiB 0%
Other 4.4 KiB 0%
Other 2.3 KiB 0%
Other 436 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
4128ms total JS execution
FIX
4128ms total JS execution
Warning::
https://github.githubassets.com/assets/chunk-39118...: 2510ms CPU time
Warning::
https://github.githubassets.com/assets/react-lib-1...: 466ms CPU time
Warning::
https://github.com/: 335ms CPU time
Warning::
https://github.githubassets.com/assets/46752-7bd89...: 280ms CPU time
Info::
Unattributable: 164ms CPU time
Warning::
Third-party scripts: 3793ms (92% of total)

Main Thread Breakdown

Other 67% Script Evaluation 18% Style & Layout 9% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://github.githubassets.com/assets/chunk-39118-635712f2ef75199c.js2510ms71ms1ms3rd
https://github.githubassets.com/assets/react-lib-1353f2cef82bcdc0.js466ms336ms15ms3rd
https://github.com/335ms2ms0ms1st
https://github.githubassets.com/assets/46752-7bd8967216f7ea42.js280ms19ms2ms3rd
Unattributable164ms17ms0ms3rd
https://github.githubassets.com/assets/landing-pages-29d9816a92404e81.js135ms93ms41ms3rd
https://github.githubassets.com/assets/behaviors-d9f0cee1f9e3eb0f.js127ms51ms9ms3rd
https://github.githubassets.com/assets/81058-fc9ccbdd06141af8.js112ms67ms1ms3rd
F
JS Bundles
Action
94 scripts, 789 KB unused
FIX
94 scripts, 789 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: 789 KB
789 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
149 resources · 4.4 MB · 789 KB savings available
FIX
149 resources · 4.4 MB · 789 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::
~789 KB of savings available
Warning::
147 third-party resources (97% of weight)
Info::
5 resources over 200KB
149 resources · 4.4 MiB · 147 third-party 3.4 MiB over 1MB target
JavaScript 39% · 1.7 MiB
Image 28% · 1.2 MiB
Other 18% · 813.8 KiB
CSS 6% · 279.3 KiB
Font 6% · 251.5 KiB
Document 3% · 128.7 KiB
Media 0% · 436 B

~788.6 KiB of savings available

Remove unused JavaScript: 788.6 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
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.
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
privateOnly browser cache, not CDN/proxy
must-revalidateMust 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 500 ms 1.0 s 1.5 s FCP 962 ms LCP 1.8 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 — 44 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 — 26 ms — font-display: swap
MonaSansVF-wdth-wght-op... woff2 swap
Size 215 KB
Load time 44 ms
Start 86 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 26 ms
Start 277 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+
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
Network Waterfall
149 requests over 1669ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 962 ms LCP 1.8 shttps://github.com// https://github.com/ — 200 — 128.7 KiB — 161 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 — 919 B — 37 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 — 44 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 — 32 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 — 6.6 KiB — 32 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 — 32 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 — 6.9 KiB — 32 ms — h2https://github.githubassets.com/assets/primer-primitives-7f694b60439d06c0.cssgithub.githubassets.com/assets/prim... https://github.githubassets.com/assets/primer-primitives-7f694b60439d06c0.css — 200 — 2.1 KiB — 37 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 — 41 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 — 39 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 — 35 ms — h2https://github.githubassets.com/assets/site-8e580c38ab6535be.cssgithub.githubassets.com/assets/site... https://github.githubassets.com/assets/site-8e580c38ab6535be.css — 200 — 82.6 KiB — 36 ms — h2https://github.githubassets.com/assets/landing-pages-270babc3e592e1db.cssgithub.githubassets.com/assets/land... https://github.githubassets.com/assets/landing-pages-270babc3e592e1db.css — 200 — 437 B — 19 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 — 19 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 — 752 B — 32 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 — 700 B — 18 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 — 4 ms — h3https://github.githubassets.com/assets/landing-pages.95e52e4789131d48.module.cssgithub.githubassets.com/assets/land... https://github.githubassets.com/assets/landing-pages.95e52e4789131d48.module.css — 200 — 13.1 KiB — 5 ms — h3https://github.githubassets.com/assets/keyboard-shortcuts-dialog.670668115736ecbc.module.cssgithub.githubassets.com/assets/keyb... https://github.githubassets.com/assets/keyboard-shortcuts-dialog.670668115736ecbc.module.css — 200 — 643 B — 6 ms — h3https://github.githubassets.com/assets/marketing-navigation.9c460dc5436e5da3.module.cssgithub.githubassets.com/assets/mark... https://github.githubassets.com/assets/marketing-navigation.9c460dc5436e5da3.module.css — 200 — 2.2 KiB — 10 ms — h3https://github.githubassets.com/assets/wp-runtime-a47dc0411ec7d2be.jsgithub.githubassets.com/assets/wp-r... https://github.githubassets.com/assets/wp-runtime-a47dc0411ec7d2be.js — 200 — 21.5 KiB — 47 ms — h3https://github.githubassets.com/assets/fetch-utilities-3140609b5732710f.jsgithub.githubassets.com/assets/fetc... https://github.githubassets.com/assets/fetch-utilities-3140609b5732710f.js — 200 — 3.4 KiB — 55 ms — h3https://github.githubassets.com/assets/28839-7adfdde5afeb1a03.jsgithub.githubassets.com/assets/2883... https://github.githubassets.com/assets/28839-7adfdde5afeb1a03.js — 200 — 6.1 KiB — 55 ms — h3https://github.githubassets.com/assets/85924-ac5602ef611dc506.jsgithub.githubassets.com/assets/8592... https://github.githubassets.com/assets/85924-ac5602ef611dc506.js — 200 — 5.4 KiB — 55 ms — h3https://github.githubassets.com/assets/34646-4c7883eb242d5210.jsgithub.githubassets.com/assets/3464... https://github.githubassets.com/assets/34646-4c7883eb242d5210.js — 200 — 6.7 KiB — 55 ms — h3https://github.githubassets.com/assets/environment-8e8857b66d545299.jsgithub.githubassets.com/assets/envi... https://github.githubassets.com/assets/environment-8e8857b66d545299.js — 200 — 7.5 KiB — 56 ms — h3https://github.githubassets.com/assets/runtime-helpers-cb4dfbc9d23f30be.jsgithub.githubassets.com/assets/runt... https://github.githubassets.com/assets/runtime-helpers-cb4dfbc9d23f30be.js — 200 — 1.5 KiB — 56 ms — h3https://github.githubassets.com/assets/2966-d68f2b4558d86113.jsgithub.githubassets.com/assets/2966... https://github.githubassets.com/assets/2966-d68f2b4558d86113.js — 200 — 7.3 KiB — 56 ms — h3https://github.githubassets.com/assets/96232-540ff5f81016a9ca.jsgithub.githubassets.com/assets/9623... https://github.githubassets.com/assets/96232-540ff5f81016a9ca.js — 200 — 3.7 KiB — 56 ms — h3https://github.githubassets.com/assets/41013-647932573fc130af.jsgithub.githubassets.com/assets/4101... https://github.githubassets.com/assets/41013-647932573fc130af.js — 200 — 5.4 KiB — 56 ms — h3
0 ms 500 ms 1.0 s 1.5 s FCP 962 ms LCP 1.8 shttps://github.com// https://github.com/ — 200 — 128.7 KiB — 161 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 — 919 B — 37 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 — 44 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 — 32 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 — 6.6 KiB — 32 ms — 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34.1 KiB — 13 ms — h3https://images.ctfassets.net/8aevphvgewt8/g1XhuDG7foMyNWIEIpGJj/b40a790b854d0803704deb7905b1bd82/logo-duolingo-14477f9e54a6.svgimages.ctfassets.net/8aevphvgewt8/g... https://images.ctfassets.net/8aevphvgewt8/g1XhuDG7foMyNWIEIpGJj/b40a790b854d0803704deb7905b1bd82/logo-duolingo-14477f9e54a6.svg — 200 — 3.2 KiB — 103 ms — h2https://images.ctfassets.net/8aevphvgewt8/6Qr8Snm4JceoMFRJhapgFa/802ded1d2c486a9d0a4c073d9f8f38f4/logo-gartner-aa8c2e452b64.svgimages.ctfassets.net/8aevphvgewt8/6... https://images.ctfassets.net/8aevphvgewt8/6Qr8Snm4JceoMFRJhapgFa/802ded1d2c486a9d0a4c073d9f8f38f4/logo-gartner-aa8c2e452b64.svg — 200 — 1.7 KiB — 115 ms — h2https://images.ctfassets.net/8aevphvgewt8/1Dt1ncaR6ZM4dQvknFzfBI/e5c2092be5bd53881622eced4fd37564/accordion-1-ce487d44c0bf.webpimages.ctfassets.net/8aevphvgewt8/1... https://images.ctfassets.net/8aevphvgewt8/1Dt1ncaR6ZM4dQvknFzfBI/e5c2092be5bd53881622eced4fd37564/accordion-1-ce487d44c0bf.webp — 200 — 163.1 KiB — 131 ms — h2https://images.ctfassets.net/8aevphvgewt8/1uXZYDy7dMcH9QwxuAU06F/1cb167cc60d725b8cf7089faf9a4ed06/accordion-2-730955545f07.webpimages.ctfassets.net/8aevphvgewt8/1... https://images.ctfassets.net/8aevphvgewt8/1uXZYDy7dMcH9QwxuAU06F/1cb167cc60d725b8cf7089faf9a4ed06/accordion-2-730955545f07.webp — 200 — 208.9 KiB — 125 ms — h2https://images.ctfassets.net/8aevphvgewt8/3xzVZaJhqo3B62R8NeHjX2/e37c81e4f26e9dac2aff1f23a0243087/accordion-3-52ca331d22ea.webpimages.ctfassets.net/8aevphvgewt8/3... https://images.ctfassets.net/8aevphvgewt8/3xzVZaJhqo3B62R8NeHjX2/e37c81e4f26e9dac2aff1f23a0243087/accordion-3-52ca331d22ea.webp — 200 — 187.4 KiB — 101 ms — h2https://images.ctfassets.net/8aevphvgewt8/3cgNgdKFqflI27vyDh4Gpa/c459dc8690133e7663b8db2626cf2045/accordion-4-a26744b70ff7.webpimages.ctfassets.net/8aevphvgewt8/3... https://images.ctfassets.net/8aevphvgewt8/3cgNgdKFqflI27vyDh4Gpa/c459dc8690133e7663b8db2626cf2045/accordion-4-a26744b70ff7.webp — 200 — 120.6 KiB — 112 ms — h2https://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 — 6 ms — h3https://github.githubassets.com/assets/chunk-46661-340033b0f9e3d043.jsgithub.githubassets.com/assets/chun... https://github.githubassets.com/assets/chunk-46661-340033b0f9e3d043.js — 200 — 3.9 KiB — 4 ms — h3https://github.githubassets.com/assets/chunk-52864-dd33de6d66e9a341.jsgithub.githubassets.com/assets/chun... https://github.githubassets.com/assets/chunk-52864-dd33de6d66e9a341.js — 200 — 1.4 KiB — 3 ms — h3https://github.githubassets.com/assets/chunk-68015-6ff93618da88d2de.jsgithub.githubassets.com/assets/chun... https://github.githubassets.com/assets/chunk-68015-6ff93618da88d2de.js — 200 — 1.4 KiB — 3 ms — h3https://github.githubassets.com/assets/cat-53c4522f687c1719.glbgithub.githubassets.com/assets/cat-... https://github.githubassets.com/assets/cat-53c4522f687c1719.glb — 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https://github.githubassets.com/assets/shield_blur-bd197c0b02963d75.jpg — 200 — 29.8 KiB — 36 ms — h3https://github.githubassets.com/assets/code-1_desktop-6d44c7cb53b4aebb.mp4github.githubassets.com/assets/code... https://github.githubassets.com/assets/code-1_desktop-6d44c7cb53b4aebb.mp4 — 206 — 436 B — 106 ms — h3https://collector.github.com/github/collectcollector.github.com/github/collect https://collector.github.com/github/collect — 204 — 469 B — 306 ms — h2https://github.githubassets.com/assets/chunk-85825-bc9e06a98995d0c2.jsgithub.githubassets.com/assets/chun... https://github.githubassets.com/assets/chunk-85825-bc9e06a98995d0c2.js — 200 — 9.6 KiB — 3 ms — h3https://collector.github.com/github/collectcollector.github.com/github/collect https://collector.github.com/github/collect — 204 — 468 B — 236 ms — h2https://github.githubassets.com/assets/chunk-39118-635712f2ef75199c.jsgithub.githubassets.com/assets/chun... 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h3https://github.githubassets.com/assets/chunk-37103-675d8739fa7718e8.jsgithub.githubassets.com/assets/chun... https://github.githubassets.com/assets/chunk-37103-675d8739fa7718e8.js — 200 — 2.0 KiB — 6 ms — h3https://api.github.com/_private/browser/statsapi.github.com/_private/browser/sta... https://api.github.com/_private/browser/stats — 200 — 0 B — 216 ms — h2https://collector.github.com/github/collectcollector.github.com/github/collect https://collector.github.com/github/collect — 204 — 468 B — 152 ms — h2https://collector.github.com/github/collectcollector.github.com/github/collect https://collector.github.com/github/collect — 204 — 468 B — 108 ms — h2https://collector.github.com/github/collectcollector.github.com/github/collect https://collector.github.com/github/collect — 204 — 468 B — 105 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
92% of JavaScript execution is third-party
First-party Third-party 3793ms · 625KB · $50/mo
github.githubassets.com
Other
Costly
Execution 2510ms
Transfer 10 KB
Monthly Cost $33/mo
github.githubassets.com
Other
Costly
Execution 466ms
Transfer 88 KB
Unused 59%
Monthly Cost $6/mo
github.githubassets.com
Other
Costly
Execution 280ms
Transfer 26 KB
Monthly Cost $4/mo
Unattributable
Other
Optional
Execution 164ms
Transfer 0 KB
Monthly Cost $2/mo
github.githubassets.com
Other
Optional
Execution 135ms
Transfer 438 KB
Unused 93%
Monthly Cost $2/mo
github.githubassets.com
Other
Optional
Execution 127ms
Transfer 54 KB
Unused 81%
Monthly Cost $2/mo
github.githubassets.com
Other
Optional
Execution 112ms
Transfer 9 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • github.githubassets.com adds 2510ms and costs ~$33/month
  • github.githubassets.com adds 466ms and costs ~$6/month
  • github.githubassets.com adds 280ms and costs ~$4/month

92% 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 2510ms 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 466ms 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 280ms 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

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 (2026-04-11 — 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
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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