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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
6
REVIEW
2
PASS
5
INFO
2

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

Mobile Desktop
59
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
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.

2.46 s

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

3.03 s

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

250 ms

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

0.007

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

2.72 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.

5.55 s

Page Load Progression

598 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
15
5 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 382.8 KiB 9%
Fonts 277.3 KiB 7%
CSS 70.5 KiB 2%
Other 12.0 KiB 0%
Images 5.4 KiB 0%
Other 2.1 KiB 0%
Other 736 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
D
JS Execution Cost
Action
2057ms total JS execution
FIX
2057ms total JS execution
Warning::
https://assets-proxy.anthropic.com/claude-ai/v2/as...: 612ms CPU time
Warning::
https://claude.com/: 557ms CPU time
Warning::
Unattributable: 444ms CPU time
Info::
https://assets-proxy.anthropic.com/claude-ai/v2/as...: 242ms CPU time
Info::
https://js.intercomcdn.com/frame-modern.db2b74ec.j...: 130ms CPU time
Warning::
Third-party scripts: 1427ms (69% of total)

Main Thread Breakdown

Script Evaluation 43% Other 31% Rendering 10% Style & Layout 7% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/vendor-D-L2qMyi.js612ms426ms2ms3rd
https://claude.com/557ms9ms30ms1st
Unattributable444ms19ms0ms3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/index-D1uHunRD.js242ms214ms7ms3rd
https://js.intercomcdn.com/frame-modern.db2b74ec.js130ms114ms15ms3rd
https://claude.com/login73ms34ms1ms1st
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
2421 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/index-D1uHunRD.js2162 KB1811 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 KB—✓3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cbc4150d0-CTKm9kLf.js1 KB—✓3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cfb7143a4-BZ3oR7X8.js2 KB—✓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
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% · 382.8 KiB
Font 7% · 277.3 KiB
CSS 2% · 70.5 KiB
Image 0% · 17.1 KiB
Other 0% · 3.0 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-store—Never cache this response
B
Image Optimization
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Info::
All images are well-optimized
9 images 5 KB
0 oversized -0 KB
6 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 1.0 s 2.0 s 3.0 s FCP 2.5 s LCP 3.0 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 — 93 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 — 87 ms — font-display: swap
cc27851ad-CFxw3nG7.woff2 woff2 swap
Size 116 KB
Load time 93 ms
Start 174 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 87 ms
Start 175 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
81 requests over 2478ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.5 s LCP 3.0 shttps://claude.com// https://claude.com/ — 200 — 381.7 KiB — 141 ms — h3https://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 — 93 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 — 87 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 — 327 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 — 566.7 KiB — 258 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 — 189 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 — 74 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 — 195 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 — 187 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 — 187 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 — 188 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 — 207 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 — 195 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 — 195 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 — 236 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 — 207 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 — 207 ms — h3https://claude.ai/login/popup-google-authclaude.ai/login/popup-google-auth https://claude.ai/login/popup-google-auth — -1 — 0 B — 83 ms — https://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 — 48 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 — 204 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 — 204 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 — 232 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 — 218 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 — 218 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 — 218 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 — 217 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 — 217 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 — 217 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 — 217 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 — 216 ms — h3
0 ms 1.0 s 2.0 s 3.0 s FCP 2.5 s LCP 3.0 shttps://claude.com// https://claude.com/ — 200 — 381.7 KiB — 141 ms — h3https://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 — 93 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 — 87 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 — 327 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 — 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— 200 — 60 B — 106 ms — h3https://cdn.sanity.io/files/4zrzovbb/website/032a2abc20d7be25555ccbfbdf0a6a98082156ad.webmcdn.sanity.io/files/4zrzovbb/websit... https://cdn.sanity.io/files/4zrzovbb/website/032a2abc20d7be25555ccbfbdf0a6a98082156ad.webm — -1 — 0 B — 122 ms — https://a-cdn.claude.ai/params/sri/EEA5F558-D6AC-4C03-B678-AABF639EE69Aa-cdn.claude.ai/params/sri/EEA5F558... https://a-cdn.claude.ai/params/sri/EEA5F558-D6AC-4C03-B678-AABF639EE69A — -1 — 0 B — 85 ms — https://a-cdn.claude.ai/params/sri/EEA5F558-D6AC-4C03-B678-AABF639EE69Aa-cdn.claude.ai/params/sri/EEA5F558... https://a-cdn.claude.ai/params/sri/EEA5F558-D6AC-4C03-B678-AABF639EE69A — 200 — 0 B — 72 ms — h3https://a-cdn.anthropic.com/v1/projects/LKJN8LsLERHEOXkw487o7qCTFOrGPimI/settingsa-cdn.anthropic.com/v1/projects/LKJ... https://a-cdn.anthropic.com/v1/projects/LKJN8LsLERHEOXkw487o7qCTFOrGPimI/settings — 200 — 1.3 KiB — 23 ms — h3https://a-cdn.anthropic.com/next-integrations/actions/3962/1faa179dfb20d0a3f5a0.jsa-cdn.anthropic.com/next-integratio... https://a-cdn.anthropic.com/next-integrations/actions/3962/1faa179dfb20d0a3f5a0.js — 200 — 9.3 KiB — 27 ms — h2https://browser-intake-us5-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pub71869dceb5b70dba6123af9ca357d1f9&dd-evp-origin-version=6.31.0&dd-evp-origin=browser&dd-request-id=6f66a2d6-8f8b-4531-9c61-07ebe3e5634c&batch_time=1776812582180&_dd.api=fetchbrowser-intake-us5-datadoghq.com/ap... https://browser-intake-us5-datadoghq.com/api/v2/rum?ddsource=browser&dd-api-key=pub71869dceb5b70dba6123af9ca357d1f9&dd-evp-origin-version=6.31.0&dd-evp-origin=browser&dd-request-id=6f66a2d6-8f8b-4531-9c61-07ebe3e5634c&batch_time=1776812582180&_dd.api=fetch — 202 — 287 B — 497 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
69% of JavaScript execution is third-party
First-party Third-party 1427ms · 2922KB · $27/mo
assets-proxy.anthropic.com
Other
Costly
Execution 612ms
Transfer 567 KB
Unused 39%
Monthly Cost $11/mo
Unattributable
Other
Costly
Execution 444ms
Transfer 0 KB
Monthly Cost $8/mo
assets-proxy.anthropic.com
Other
Costly
Execution 242ms
Transfer 2162 KB
Unused 84%
Monthly Cost $5/mo
js.intercomcdn.com
Other
Optional
Execution 130ms
Transfer 193 KB
Unused 71%
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • assets-proxy.anthropic.com adds 612ms and costs ~$11/month
  • Unattributable adds 444ms and costs ~$8/month
  • assets-proxy.anthropic.com adds 242ms and costs ~$5/month

69% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

assets-proxy.anthropic.com takes 612ms 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 444ms 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 242ms 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

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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