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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
1
PASS
6
INFO
2

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

Mobile Desktop
48
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.
77
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.

3.33 s

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

4.45 s

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

291 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.

3.33 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.

5.51 s

Page Load Progression

756 ms
1.5 s
2.3 s
3.0 s
3.8 s
4.5 s
5.3 s
6.0 s
Checks
15
6 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
7.6 MB transferred, 78 requests
FIX
7.6 MB transferred, 78 requests
Critical::
Page weighs 18.1 MB (7.6 MB transferred)
Warning::
JavaScript is 3.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.8 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::
78 HTTP requests
Info::
Estimated 1.6 g CO2 per page load
7.6 MB / 2.4 MB budget
7.6 MB transferred
78 requests
1.6 g CO2 per page load
JavaScript 3.8 MiB 50%
Other 3.1 MiB 41%
Other 308.7 KiB 4%
Fonts 277.3 KiB 4%
CSS 75.8 KiB 1%
Other 14.7 KiB 0%
HTML 10.8 KiB 0%
Images 3.3 KiB 0%
Other 2.1 KiB 0%
Other 1.7 KiB 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
96% third-party, 0 ms blocking
FIX
96% third-party, 0 ms blocking
Warning::
Third-party code accounts for 96% of page weight (7.2 MiB of 7.6 MiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
D
JS Execution Cost
Action
2352ms total JS execution
FIX
2352ms total JS execution
Warning::
https://assets-proxy.anthropic.com/claude-ai/v2/as...: 678ms CPU time
Warning::
Unattributable: 518ms CPU time
Warning::
https://assets-proxy.anthropic.com/claude-ai/v2/as...: 364ms CPU time
Warning::
https://a-cdn.claude.ai/v2/EEA5F558-D6AC-4C03-B678...: 289ms CPU time
Info::
https://js.intercomcdn.com/vendor-modern.80eace52....: 133ms CPU time
Warning::
Third-party scripts: 2194ms (93% of total)

Main Thread Breakdown

Script Evaluation 59% Other 25% Style & Layout 8% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/vendor-DK2xADHl.js678ms516ms2ms3rd
Unattributable518ms23ms0ms3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/index-IoRulY9p.js364ms309ms10ms3rd
https://a-cdn.claude.ai/v2/EEA5F558-D6AC-4C03-B678-AABF639EE69A/api.js289ms150ms9ms3rd
https://js.intercomcdn.com/vendor-modern.80eace52.js133ms118ms14ms3rd
https://claude.ai/cdn-cgi/challenge-platform/scripts/jsd/main.js80ms76ms1ms1st
https://claude.ai/login79ms17ms1ms1st
https://s-cdn.anthropic.com/s.js78ms59ms2ms3rd
https://connect.facebook.net/en_US/fbevents.js68ms39ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-1568426566ms52ms14ms3rd
F
JS Bundles
Action
45 scripts, 2.5 MB unused
FIX
45 scripts, 2.5 MB unused
Warning::
https://assets-proxy.anthropic.com/claude-ai/v2/as...: 1.9 MB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets-proxy.anthropic.com/claude-ai/v2/as...: 185 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.intercomcdn.com/frame-modern.db2b74ec.j...: 138 KB unused (72%)
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: 71 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.5 MB
2558 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/index-IoRulY9p.js2252 KB1906 KB (85%)✓3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/vendor-DK2xADHl.js525 KB185 KB (35%)✓3rd
https://js.intercomcdn.com/frame-modern.db2b74ec.js193 KB138 KB (72%)✓3rd
https://js.intercomcdn.com/vendor-modern.80eace52.js144 KB91 KB (64%)✓3rd
https://accounts.google.com/gsi/client96 KB71 KB (75%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-15684265130 KB60 KB (46%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB43 KB (44%)✓3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c632c9594-BJqeKYzf.js49 KB39 KB (81%)✓3rd
https://a-cdn.claude.ai/v2/EEA5F558-D6AC-4C03-B678-AABF639EE69A/api.js95 KB26 KB (27%)✓3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cfcbb3627-B4F_7MyG.js9 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
78 resources · 7.6 MB · 2.5 MB savings available
FIX
78 resources · 7.6 MB · 2.5 MB savings available
Warning::
Page weight 6.6 MB over 1MB target
Got: 7.6 MB Expected: ≤ 1 MB
Info::
~2.5 MB of savings available
Warning::
65 third-party resources (96% of weight)
Info::
4 resources over 200KB
78 resources · 7.6 MiB · 65 third-party 6.6 MiB over 1MB target
JavaScript 50% · 3.8 MiB
Media 41% · 3.1 MiB
Other 4% · 313.4 KiB
Font 4% · 277.3 KiB
CSS 1% · 75.8 KiB
Image 0% · 17.2 KiB
Document 0% · 10.8 KiB

~2.5 MiB of savings available

Remove unused JavaScript: 2.5 MiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

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
Image Optimization
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 3 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
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 4.0 s FCP 3.3 s LCP 4.5 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 — 105 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 105 ms
Start 102 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
c66fc489e-C-BHYa_K.woff2 woff2 swap
Size 162 KB
Load time 120 ms
Start 105 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
78 requests over 3762ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.3 s LCP 4.5 shttps://claude.ai// https://claude.ai/ — 302 — 631 B — 37 ms — h3https://claude.ai/login/login https://claude.ai/login — 200 — 5.2 KiB — 40 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 — 105 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-IoRulY9p.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/index-IoRulY9p.js — 200 — 2.2 MiB — 311 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c6a992d55-Cl8AZJOG.cssassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c6a992d55-Cl8AZJOG.css — 200 — 71.5 KiB — 54 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/vendor-DK2xADHl.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/vendor-DK2xADHl.js — 200 — 525.1 KiB — 95 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/tree-sitter-BfScwQVn.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/tree-sitter-BfScwQVn.js — 200 — 18.5 KiB — 299 ms — h3https://claude.ai/manifest.json/manifest.json https://claude.ai/manifest.json — 200 — 1.7 KiB — 27 ms — h3https://claude.ai/edge-api/bootstrap?statsig_hashing_algorithm=djb2&growthbook_format=sdk&include_system_prompts=false/edge-api/bootstrap?statsig_hashing... https://claude.ai/edge-api/bootstrap?statsig_hashing_algorithm=djb2&growthbook_format=sdk&include_system_prompts=false — 200 — 2.4 KiB — 259 ms — h3https://claude.ai/cdn-cgi/challenge-platform/scripts/jsd/main.js/cdn-cgi/challenge-platform/scripts... https://claude.ai/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 250 B — 231 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c632c9594-BJqeKYzf.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c632c9594-BJqeKYzf.js — 200 — 48.8 KiB — 83 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c57c2877c-x0rbpIpf.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c57c2877c-x0rbpIpf.js — 200 — 4.9 KiB — 43 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c6a9356e8-DKTY1eL6.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c6a9356e8-DKTY1eL6.js — 200 — 4.6 KiB — 20 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c4a0394fd-CfO4lAbx.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c4a0394fd-CfO4lAbx.js — 200 — 33.9 KiB — 56 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c4fba3bc0-BGaCGpz3.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c4fba3bc0-BGaCGpz3.js — 200 — 3.8 KiB — 41 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c029a409d-DTutf9fi.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c029a409d-DTutf9fi.js — 200 — 6.1 KiB — 40 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cded40f2a-WP1YsIpb.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cded40f2a-WP1YsIpb.js — 200 — 14.2 KiB — 84 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cded40f2a-FWJX77zY.cssassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cded40f2a-FWJX77zY.css — 200 — 1.3 KiB — 26 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cfb7143a4-B-NkkSqY.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cfb7143a4-B-NkkSqY.js — 200 — 1.6 KiB — 86 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c19e49841-COO6cOZA.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c19e49841-COO6cOZA.js — 200 — 5.6 KiB — 39 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/ce1bfd762-DL3C2iqA.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/ce1bfd762-DL3C2iqA.js — 200 — 3.6 KiB — 53 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c8901fcbe-7L5Ih0Cv.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c8901fcbe-7L5Ih0Cv.js — 200 — 8.4 KiB — 52 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cc2e285cb-DqyvRBZm.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cc2e285cb-DqyvRBZm.js — 200 — 4.0 KiB — 68 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c4ba74563-BtX67UVr.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c4ba74563-BtX67UVr.js — 200 — 12.4 KiB — 77 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cbcae692c-B01tXjr-.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cbcae692c-B01tXjr-.js — 200 — 4.6 KiB — 52 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c62343a9d-CcAVSmgw.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c62343a9d-CcAVSmgw.js — 200 — 3.7 KiB — 65 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cac5c74b6-DFyaFBeZ.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/cac5c74b6-DFyaFBeZ.js — 200 — 5.7 KiB — 52 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c56e0b5dd-D7FyVcgg.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c56e0b5dd-D7FyVcgg.js — 200 — 3.0 KiB — 62 ms — h3https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c14703658-BVGVgNTj.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/c14703658-BVGVgNTj.js — 200 — 6.9 KiB — 62 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.3 s LCP 4.5 shttps://claude.ai// https://claude.ai/ — 302 — 631 B — 37 ms — h3https://claude.ai/login/login https://claude.ai/login — 200 — 5.2 KiB — 40 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 — 105 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-IoRulY9p.jsassets-proxy.anthropic.com/claude-a... https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/index-IoRulY9p.js — 200 — 2.2 MiB — 311 ms — 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https://connect.facebook.net/signals/config/468742119653388?v=2.9.303&r=stable&domain=a.claude.ai&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168 — 200 — 39.3 KiB — 15 ms — h3https://s-cdn.anthropic.com/images/422039.gif?bk=99dfa2e716&r=865466766&v=120&cs=UTF-8&h=claude.ai&l=en-US&S=7756161b435926970499a058b8c1f8c2&uu=70a6b351-fa3a-4c34-9282-6530de6e5921&t=Claude&u=https%3A%2F%2Fclaude.ai%2Flogin&ua=Mozilla%2F5.0%20(Macintosh%3B%20Intel%20Mac%20OS%20X%2010_15_7)%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F146.0.0.0%20Safari%2F537.36&nm=2&mh=63196a00446a1e285d1992cfe444aa55&np=5&ph=332b72bdb211e34e6e3c24f88d7c393b&sh=600&sw=800&cd=24&p=Linux%20x86_64&to=0&d=0&ce=true&tp=0&ol=true&pr=Gecko&ps=20030107&vd=Google%20Inc.&hc=4&je=false&ss=true&ls=true&in=true&db=false&tl=false&tr=false&tb=false&ab=false&cf=e4da8fa1899d52a7212b625daf37542b&sri=0&pf=84&inc=true&bn=Chrome&ow=780&oh=580&wd=false&npe=default&fph=c0f48806e2dc75d6fcbd91de7957bb6f&fsh=600&fsw=800&fcd=24&fp=Linux%20x86_64&ftp=0&fhc=4&fss=true&fls=true&fin=true&fvch=418711b9360f0ff97a5476ce480683b2&fad=124.04347527516074&fdm=4&fvf=chrome&fcg=srgb&ffc=false&fm=0&fc=0&frm=false&fhdr=false&fmf=1b4539be02333d14ce0a07c372e6a7d4&fa=255&fte=false&fts=false&fce=true&fpdf=true&fl=cce16c45e622d9ceae4b626c9353ecec&ft=UTC&pfe=17&z=zs-cdn.anthropic.com/images/422039.g... https://s-cdn.anthropic.com/images/422039.gif?bk=99dfa2e716&r=865466766&v=120&cs=UTF-8&h=claude.ai&l=en-US&S=7756161b435926970499a058b8c1f8c2&uu=70a6b351-fa3a-4c34-9282-6530de6e5921&t=Claude&u=https%3A%2F%2Fclaude.ai%2Flogin&ua=Mozilla%2F5.0%20(Macintosh%3B%20Intel%20Mac%20OS%20X%2010_15_7)%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F146.0.0.0%20Safari%2F537.36&nm=2&mh=63196a00446a1e285d1992cfe444aa55&np=5&ph=332b72bdb211e34e6e3c24f88d7c393b&sh=600&sw=800&cd=24&p=Linux%20x86_64&to=0&d=0&ce=true&tp=0&ol=true&pr=Gecko&ps=20030107&vd=Google%20Inc.&hc=4&je=false&ss=true&ls=true&in=true&db=false&tl=false&tr=false&tb=false&ab=false&cf=e4da8fa1899d52a7212b625daf37542b&sri=0&pf=84&inc=true&bn=Chrome&ow=780&oh=580&wd=false&npe=default&fph=c0f48806e2dc75d6fcbd91de7957bb6f&fsh=600&fsw=800&fcd=24&fp=Linux%20x86_64&ftp=0&fhc=4&fss=true&fls=true&fin=true&fvch=418711b9360f0ff97a5476ce480683b2&fad=124.04347527516074&fdm=4&fvf=chrome&fcg=srgb&ffc=false&fm=0&fc=0&frm=false&fhdr=false&fmf=1b4539be02333d14ce0a07c372e6a7d4&fa=255&fte=false&fts=false&fce=true&fpdf=true&fl=cce16c45e622d9ceae4b626c9353ecec&ft=UTC&pfe=17&z=z — 200 — 246 B — 228 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=7b7d9c1a-da39-4570-9fa1-22ad8da2297e&batch_time=1776802872354&_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=7b7d9c1a-da39-4570-9fa1-22ad8da2297e&batch_time=1776802872354&_dd.api=fetch — 202 — 112 B — 482 ms — h2https://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 — 8.8 KiB — 15 ms — h3https://js.intercomcdn.com/frame-modern.db2b74ec.jsjs.intercomcdn.com/frame-modern.db2... https://js.intercomcdn.com/frame-modern.db2b74ec.js — 200 — 193.3 KiB — 33 ms — h2https://js.intercomcdn.com/vendor-modern.80eace52.jsjs.intercomcdn.com/vendor-modern.80... https://js.intercomcdn.com/vendor-modern.80eace52.js — 200 — 143.9 KiB — 46 ms — h2https://a-cdn.claude.ai/v2/EEA5F558-D6AC-4C03-B678-AABF639EE69A/settingsa-cdn.claude.ai/v2/EEA5F558-D6AC-4C... https://a-cdn.claude.ai/v2/EEA5F558-D6AC-4C03-B678-AABF639EE69A/settings — 200 — 1.3 KiB — 7 ms — h3https://accounts.google.com/gsi/styleaccounts.google.com/gsi/style https://accounts.google.com/gsi/style — 200 — 665 B — 20 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
93% of JavaScript execution is third-party
First-party Third-party 2194ms · 3262KB · CA$30/mo
assets-proxy.anthropic.com
Other
Costly
Execution 678ms
Transfer 525 KB
Unused 35%
Monthly Cost CA$9/mo
Unattributable
Other
Costly
Execution 518ms
Transfer 0 KB
Monthly Cost CA$7/mo
assets-proxy.anthropic.com
Other
Costly
Execution 364ms
Transfer 2252 KB
Unused 85%
Monthly Cost CA$5/mo
a-cdn.claude.ai
Other
Costly
Execution 289ms
Transfer 95 KB
Unused 27%
Monthly Cost CA$4/mo
js.intercomcdn.com
Other
Optional
Execution 133ms
Transfer 144 KB
Unused 64%
Monthly Cost CA$2/mo
s-cdn.anthropic.com
Other
Optional
Execution 78ms
Transfer 20 KB
Monthly Cost CA$1/mo
Facebook Pixel
Advertising
Optional
Execution 68ms
Transfer 97 KB
Unused 44%
Monthly Cost CA$1/mo
Google Tag Manager
Tag Manager
Optional
Execution 66ms
Transfer 130 KB
Unused 46%
Monthly Cost CA$1/mo

These scripts may cost more than they're worth

  • assets-proxy.anthropic.com adds 678ms and costs ~CA$9/month
  • Unattributable adds 518ms and costs ~CA$7/month
  • assets-proxy.anthropic.com adds 364ms and costs ~CA$5/month
  • a-cdn.claude.ai adds 289ms and costs ~CA$4/month

93% 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 678ms 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 518ms 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 364ms 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

85% 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

a-cdn.claude.ai takes 289ms 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

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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