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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

32
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.
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.

21.12 s

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

28.77 s

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

1.13 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.

21.12 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.

28.78 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
4.2 MB transferred, 81 requests
FIX
4.2 MB transferred, 81 requests
Critical::
Page weighs 13.6 MB (4.2 MB transferred)
Warning::
JavaScript is 3.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.4 MB
Info::
Fonts are 277 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 277 KB
Info::
81 HTTP requests
Info::
Estimated 0.87 g CO2 per page load
4.2 MB / 2.4 MB budget
4.2 MB transferred
81 requests
0.87 g CO2 per page load
JavaScript 3.4 MiB 82%
HTML 383.4 KiB 9%
Fonts 277.3 KiB 7%
CSS 70.4 KiB 2%
Other 12.0 KiB 0%
Images 4.6 KiB 0%
Other 2.1 KiB 0%
Other 855 B 0%
Other 0 B 0%
Other 0 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

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

D
Third-Party Impact
Action
90% third-party, 0 ms blocking
FIX
90% third-party, 0 ms blocking
Warning::
Third-party code accounts for 90% of page weight (3.8 MiB of 4.2 MiB)
Info::
Third-party blocking time is low (0 ms)
90%
First-party Third-party
F
JS Execution Cost
Action
6086ms total JS execution
FIX
6086ms total JS execution
Warning::
https://assets-proxy.anthropic.com/claude-ai/v2/as...: 1659ms CPU time
Warning::
Unattributable: 1623ms CPU time
Warning::
https://assets-proxy.anthropic.com/claude-ai/v2/as...: 877ms CPU time
Warning::
https://claude.com/: 541ms CPU time
Warning::
https://js.intercomcdn.com/vendor-modern.80eace52....: 465ms CPU time
Warning::
Third-party scripts: 5341ms (88% of total)

Main Thread Breakdown

Script Evaluation 51% Other 30% Script Parsing & Compilation 7% Style & Layout 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/vendor-D-L2qMyi.js1659ms1363ms7ms3rd
Unattributable1623ms52ms0ms3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/index-D1uHunRD.js877ms782ms25ms3rd
https://claude.com/541ms20ms141ms1st
https://js.intercomcdn.com/vendor-modern.80eace52.js465ms417ms47ms3rd
https://a-cdn.claude.ai/v2/EEA5F558-D6AC-4C03-B678-AABF639EE69A/api.js210ms168ms40ms3rd
https://claude.com/login204ms98ms3ms1st
https://accounts.google.com/gsi/client153ms62ms90ms3rd
https://js.intercomcdn.com/frame-modern.db2b74ec.js81ms12ms69ms3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c6a992d55-BW2v43Aa.css76ms0ms0ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
41 scripts, 2.4 MB unused
FIX
41 scripts, 2.4 MB unused
Warning::
https://assets-proxy.anthropic.com/claude-ai/v2/as...: 1.8 MB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets-proxy.anthropic.com/claude-ai/v2/as...: 221 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.intercomcdn.com/frame-modern.db2b74ec.j...: 138 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.intercomcdn.com/vendor-modern.80eace52....: 91 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 72 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.4 MB
2420 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/index-D1uHunRD.js2162 KB1810 KB (84%)3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/vendor-D-L2qMyi.js567 KB221 KB (39%)3rd
https://js.intercomcdn.com/frame-modern.db2b74ec.js193 KB138 KB (71%)3rd
https://js.intercomcdn.com/vendor-modern.80eace52.js144 KB91 KB (64%)3rd
https://accounts.google.com/gsi/client96 KB72 KB (75%)3rd
https://a-cdn.claude.ai/v2/EEA5F558-D6AC-4C03-B678-AABF639EE69A/api.js103 KB60 KB (59%)3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c632c9594-D8R6jS5L.js44 KB29 KB (67%)3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c56e0b5dd-CHtskdbB.js3 KB3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cbc4150d0-CTKm9kLf.js1 KB3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cfb7143a4-BZ3oR7X8.js2 KB3rd

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
81 resources · 4.2 MB · 2.4 MB savings available
FIX
81 resources · 4.2 MB · 2.4 MB savings available
Warning::
Page weight 3.2 MB over 1MB target
Got: 4.2 MB Expected: ≤ 1 MB
Info::
~2.4 MB of savings available
Warning::
73 third-party resources (90% of weight)
Info::
3 resources over 200KB
81 resources · 4.2 MiB · 73 third-party 3.2 MiB over 1MB target
JavaScript 82% · 3.4 MiB
Document 9% · 383.4 KiB
Font 7% · 277.3 KiB
CSS 2% · 70.4 KiB
Image 0% · 16.3 KiB
Other 0% · 3.2 KiB
Media 0% · 0 B

~2.4 MiB of savings available

Remove unused JavaScript: 2.4 MiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store

DirectiveValueMeaning
no-storeNever cache this response
B
Image Optimization
8 images, 0 KB saveable
REVIEW
8 images, 0 KB saveable
Info::
All images are well-optimized
8 images 5 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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 (277 KB)
PASS
2 fonts (277 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

277 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 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s FCP 21.1 s LCP 28.8 shttps://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cc27851ad-CFxw3nG7.woff2cc27851ad-CFxw3nG7.woff2 https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cc27851ad-CFxw3nG7.woff2 — 115.5 KiB — 100 ms — font-display: swaphttps://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c66fc489e-C-BHYa_K.woff2c66fc489e-C-BHYa_K.woff2 https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c66fc489e-C-BHYa_K.woff2 — 161.8 KiB — 120 ms — font-display: swap
cc27851ad-CFxw3nG7.woff2 woff2 swap
Size 116 KB
Load time 100 ms
Start 155 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
c66fc489e-C-BHYa_K.woff2 woff2 swap
Size 162 KB
Load time 120 ms
Start 155 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
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 ~139 KB and ~278 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
2
preload
2
dns-prefetch
1
prefetch
1

6 resource hints configured

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
Network Waterfall
81 requests over 2619ms
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 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s FCP 21.1 s LCP 28.8 shttps://claude.com// https://claude.com/ — 200 — 382.3 KiB — 114 ms — h2https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cc27851ad-CFxw3nG7.woff2assets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cc27851ad-CFxw3nG7.woff2 — 200 — 115.5 KiB — 100 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c66fc489e-C-BHYa_K.woff2assets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c66fc489e-C-BHYa_K.woff2 — 200 — 161.8 KiB — 120 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/index-D1uHunRD.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/index-D1uHunRD.js — 200 — 2.1 MiB — 408 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/vendor-D-L2qMyi.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/vendor-D-L2qMyi.js — 200 — 566.8 KiB — 311 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/tree-sitter-CeEgPZiZ.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/tree-sitter-CeEgPZiZ.js — 200 — 19.5 KiB — 239 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c6a992d55-BW2v43Aa.cssassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c6a992d55-BW2v43Aa.css — 200 — 65.8 KiB — 89 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c632c9594-D8R6jS5L.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c632c9594-D8R6jS5L.js — 200 — 43.8 KiB — 264 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/ce2a6f899-B3IpHoGW.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/ce2a6f899-B3IpHoGW.js — 200 — 2.6 KiB — 240 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c8f5e99bb-WlxqSB9K.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c8f5e99bb-WlxqSB9K.js — 200 — 1.2 KiB — 240 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c6a9356e8-CVNqRFC9.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c6a9356e8-CVNqRFC9.js — 200 — 4.6 KiB — 240 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c4a0394fd-GeVSx6Nz.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c4a0394fd-GeVSx6Nz.js — 200 — 33.9 KiB — 264 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c029a409d-DttcEcfn.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c029a409d-DttcEcfn.js — 200 — 6.1 KiB — 246 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cfb7143a4-BZ3oR7X8.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cfb7143a4-BZ3oR7X8.js — 200 — 1.6 KiB — 246 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c19e49841-Cw6fg74W.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c19e49841-Cw6fg74W.js — 200 — 5.7 KiB — 281 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cb53cddab-CDIft4Qr.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cb53cddab-CDIft4Qr.js — 200 — 1.1 KiB — 263 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/ce70e73dc-Dz0uSksL.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/ce70e73dc-Dz0uSksL.js — 200 — 13.1 KiB — 263 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/ce70e73dc-CpTxwkEo.cssassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/ce70e73dc-CpTxwkEo.css — 200 — 1.1 KiB — 76 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c8901fcbe-CxNtjPMe.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c8901fcbe-CxNtjPMe.js — 200 — 8.3 KiB — 264 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c0b6b321b-B9tJOhPK.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c0b6b321b-B9tJOhPK.js — 200 — 1.1 KiB — 264 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c4ba74563-DadHRNHr.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c4ba74563-DadHRNHr.js — 200 — 12.4 KiB — 282 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c1af03898-Cab6mamX.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c1af03898-Cab6mamX.js — 200 — 1.7 KiB — 282 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c3a41fcbb-BxZFQVjh.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c3a41fcbb-BxZFQVjh.js — 200 — 3.6 KiB — 282 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c9560eacf-CZeq7R0r.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c9560eacf-CZeq7R0r.js — 200 — 1.1 KiB — 284 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c81dd7232-LDKs4CAK.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c81dd7232-LDKs4CAK.js — 200 — 1.3 KiB — 284 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c56e0b5dd-CHtskdbB.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c56e0b5dd-CHtskdbB.js — 200 — 3.0 KiB — 284 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cded40f2a-BvtRSJkJ.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cded40f2a-BvtRSJkJ.js — 200 — 1.6 KiB — 284 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c05c5ea16-iSS-cl4g.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c05c5ea16-iSS-cl4g.js — 200 — 1.5 KiB — 283 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c7c367ead-B5ZLW2HD.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c7c367ead-B5ZLW2HD.js — 200 — 1.9 KiB — 283 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cbc4150d0-CTKm9kLf.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cbc4150d0-CTKm9kLf.js — 200 — 1.4 KiB — 283 ms — h3
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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
88% of JavaScript execution is third-party
First-party Third-party 5341ms · 3344KB · $100/mo
assets-proxy.anthropic.com
Other
Costly
Execution 1659ms
Transfer 567 KB
Unused 39%
Monthly Cost $31/mo
Unattributable
Other
Costly
Execution 1623ms
Transfer 0 KB
Monthly Cost $30/mo
assets-proxy.anthropic.com
Other
Costly
Execution 877ms
Transfer 2162 KB
Unused 84%
Monthly Cost $16/mo
js.intercomcdn.com
Other
Costly
Execution 465ms
Transfer 144 KB
Unused 64%
Monthly Cost $9/mo
a-cdn.claude.ai
Other
Costly
Execution 210ms
Transfer 103 KB
Unused 59%
Monthly Cost $4/mo
accounts.google.com
Other
Optional
Execution 153ms
Transfer 96 KB
Unused 75%
Monthly Cost $3/mo
js.intercomcdn.com
Other
Optional
Execution 81ms
Transfer 193 KB
Unused 71%
Monthly Cost $2/mo
assets-proxy.anthropic.com
Other
Optional
Execution 76ms
Transfer 66 KB
Monthly Cost $1/mo
a-cdn.anthropic.com
Other
Optional
Execution 74ms
Transfer 9 KB
Monthly Cost $1/mo
Intercom Widget
Chat
Optional
Execution 69ms
Transfer 4 KB
Monthly Cost $1/mo
s-cdn.anthropic.com
Other
Optional
Execution 54ms
Transfer 0 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • assets-proxy.anthropic.com adds 1659ms and costs ~$31/month
  • Unattributable adds 1623ms and costs ~$30/month
  • assets-proxy.anthropic.com adds 877ms and costs ~$16/month
  • js.intercomcdn.com adds 465ms and costs ~$9/month
  • a-cdn.claude.ai adds 210ms and costs ~$4/month

88% 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

assets-proxy.anthropic.com takes 1659ms 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 1623ms 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

assets-proxy.anthropic.com takes 877ms 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

84% of assets-proxy.anthropic.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

js.intercomcdn.com takes 465ms 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

64% of js.intercomcdn.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

a-cdn.claude.ai takes 210ms 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 a-cdn.claude.ai'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

75% of accounts.google.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

71% of js.intercomcdn.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

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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