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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
1
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.

17.82 s

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

23.71 s

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

3.45 s

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

1.000

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

17.82 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.

29.32 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
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
4.6 MB transferred, 78 requests
FIX
4.6 MB transferred, 78 requests
Critical::
Page weighs 16.6 MB (4.6 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 0.97 g CO2 per page load
4.6 MB / 2.4 MB budget
4.6 MB transferred
78 requests
0.97 g CO2 per page load
JavaScript 3.8 MiB 82%
Other 308.6 KiB 6%
Fonts 277.3 KiB 6%
Other 158.2 KiB 3%
CSS 75.9 KiB 2%
Other 14.7 KiB 0%
HTML 10.9 KiB 0%
Images 4.8 KiB 0%
Other 1.9 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
89% third-party, 0 ms blocking
FIX
89% third-party, 0 ms blocking
Warning::
Third-party code accounts for 89% of page weight (4.2 MiB of 4.6 MiB)
Info::
Third-party blocking time is low (0 ms)
89%
First-party Third-party
F
JS Execution Cost
Action
10251ms total JS execution
FIX
10251ms total JS execution
Warning::
https://assets-proxy.anthropic.com/claude-ai/v2/as...: 3056ms CPU time
Warning::
Unattributable: 2106ms CPU time
Warning::
https://assets-proxy.anthropic.com/claude-ai/v2/as...: 1606ms CPU time
Warning::
https://a-cdn.claude.ai/v2/EEA5F558-D6AC-4C03-B678...: 1120ms CPU time
Warning::
https://js.intercomcdn.com/frame-modern.db2b74ec.j...: 558ms CPU time
Warning::
Third-party scripts: 9581ms (93% of total)

Main Thread Breakdown

Script Evaluation 59% Other 25% Style & Layout 7% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/vendor-DK2xADHl.js3056ms2262ms10ms3rd
Unattributable2106ms90ms0ms3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/index-IoRulY9p.js1606ms1412ms39ms3rd
https://a-cdn.claude.ai/v2/EEA5F558-D6AC-4C03-B678-AABF639EE69A/api.js1120ms614ms39ms3rd
https://js.intercomcdn.com/frame-modern.db2b74ec.js558ms476ms81ms3rd
https://claude.ai/cdn-cgi/challenge-platform/scripts/jsd/main.js339ms328ms3ms1st
https://claude.ai/login331ms53ms4ms1st
https://www.googletagmanager.com/gtag/js?id=DC-15684265287ms229ms56ms3rd
https://s-cdn.anthropic.com/s.js195ms175ms8ms3rd
https://connect.facebook.net/en_US/fbevents.js193ms144ms49ms3rd

Showing top 10 of 16 scripts

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...: 184 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: 72 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.5 MB
2557 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/index-IoRulY9p.js2252 KB1905 KB (85%)✓3rd
https://assets-proxy.anthropic.com/claude-ai/v2/assets/v1/vendor-DK2xADHl.js525 KB184 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 KB72 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 KB37 KB (77%)✓3rd
https://a-cdn.claude.ai/v2/EEA5F558-D6AC-4C03-B678-AABF639EE69A/api.js96 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 · 4.6 MB · 2.5 MB savings available
FIX
78 resources · 4.6 MB · 2.5 MB savings available
Warning::
Page weight 3.6 MB over 1MB target
Got: 4.6 MB Expected: ≤ 1 MB
Info::
~2.5 MB of savings available
Warning::
64 third-party resources (89% of weight)
Info::
3 resources over 200KB
78 resources · 4.6 MiB · 64 third-party 3.6 MiB over 1MB target
JavaScript 82% · 3.8 MiB
Other 7% · 313.1 KiB
Font 6% · 277.3 KiB
Media 3% · 158.2 KiB
CSS 2% · 75.9 KiB
Image 0% · 18.7 KiB
Document 0% · 10.9 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 5 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 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 FCP 17.8 s LCP 23.7 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 — 115.6 KiB — 66 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 — 86 ms — font-display: swap
cc27851ad-CFxw3nG7.woff2 woff2 swap
Size 116 KB
Load time 66 ms
Start 85 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
c66fc489e-C-BHYa_K.woff2 woff2 swap
Size 162 KB
Load time 86 ms
Start 85 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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
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
78 requests over 3955ms
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 FCP 17.8 s LCP 23.7 shttps://claude.ai// https://claude.ai/ — 302 — 630 B — 26 ms — h3https://claude.ai/login/login https://claude.ai/login — 200 — 5.2 KiB — 25 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 — 115.6 KiB — 66 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 — 86 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 — 271 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 — 58 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 — 312 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 — 313 ms — h3https://claude.ai/manifest.json/manifest.json https://claude.ai/manifest.json — 200 — 1.7 KiB — 28 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 — 663 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 — 191 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 — 30 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 — 37 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 — 35 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 — 98 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 — 68 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 — 67 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 — 66 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 — 31 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 — 65 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 — 102 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 — 101 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 — 64 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 — 65 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 — 65 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 — 65 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 — 99 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 — 65 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 — 65 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 — 107 ms — h3
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h3https://s-cdn.anthropic.com/images/534221.gif?bk=99dfa2e716&r=211078633&v=120&cs=UTF-8&h=claude.ai&l=en-US&S=30ad27876b530d4a6c09c7244ce38f7d&uu=4cf57b56-915f-4d40-aa6f-e0e13aa8f21d&t=Claude&u=https%3A%2F%2Fclaude.ai%2Flogin&ua=Mozilla%2F5.0%20(Linux%3B%20Android%2011%3B%20moto%20g%20power%20(2022))%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F146.0.0.0%20Mobile%20Safari%2F537.36&nm=2&mh=63196a00446a1e285d1992cfe444aa55&np=5&ph=332b72bdb211e34e6e3c24f88d7c393b&sh=823&sw=412&cd=24&p=Linux%20x86_64&to=0&d=0&ce=true&tp=1&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&ts=false&tb=false&ab=false&cf=140450220b77b9e81be3aab04f9b1326&sri=0&pf=36&inc=true&bn=Chrome&ow=412&oh=823&wd=false&npe=default&fph=c0f48806e2dc75d6fcbd91de7957bb6f&fsh=412&fsw=823&fcd=24&fp=Linux%20x86_64&ftp=1&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=true&fts=true&fce=true&fpdf=true&fl=cce16c45e622d9ceae4b626c9353ecec&ft=UTC&pfe=22&z=zs-cdn.anthropic.com/images/534221.g... https://s-cdn.anthropic.com/images/534221.gif?bk=99dfa2e716&r=211078633&v=120&cs=UTF-8&h=claude.ai&l=en-US&S=30ad27876b530d4a6c09c7244ce38f7d&uu=4cf57b56-915f-4d40-aa6f-e0e13aa8f21d&t=Claude&u=https%3A%2F%2Fclaude.ai%2Flogin&ua=Mozilla%2F5.0%20(Linux%3B%20Android%2011%3B%20moto%20g%20power%20(2022))%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F146.0.0.0%20Mobile%20Safari%2F537.36&nm=2&mh=63196a00446a1e285d1992cfe444aa55&np=5&ph=332b72bdb211e34e6e3c24f88d7c393b&sh=823&sw=412&cd=24&p=Linux%20x86_64&to=0&d=0&ce=true&tp=1&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&ts=false&tb=false&ab=false&cf=140450220b77b9e81be3aab04f9b1326&sri=0&pf=36&inc=true&bn=Chrome&ow=412&oh=823&wd=false&npe=default&fph=c0f48806e2dc75d6fcbd91de7957bb6f&fsh=412&fsw=823&fcd=24&fp=Linux%20x86_64&ftp=1&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=true&fts=true&fce=true&fpdf=true&fl=cce16c45e622d9ceae4b626c9353ecec&ft=UTC&pfe=22&z=z — 200 — 246 B — 256 ms — h2https://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%2C168connect.facebook.net/signals/config... 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— 200 — 39.3 KiB — 390 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 — 41 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 — 53 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 — 8 ms — h3https://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=098e64b8-2ae2-4e06-bfe4-280845dee03d&batch_time=1776802849231&_dd.api=fetchbrowser-intake-us5-datadoghq.com/ap... 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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
93% of JavaScript execution is third-party
First-party Third-party 9581ms · 3714KB · CA$132/mo
assets-proxy.anthropic.com
Other
Costly
Execution 3056ms
Transfer 525 KB
Unused 35%
Monthly Cost CA$42/mo
Unattributable
Other
Costly
Execution 2106ms
Transfer 0 KB
Monthly Cost CA$29/mo
assets-proxy.anthropic.com
Other
Costly
Execution 1606ms
Transfer 2252 KB
Unused 85%
Monthly Cost CA$22/mo
a-cdn.claude.ai
Other
Costly
Execution 1120ms
Transfer 96 KB
Unused 27%
Monthly Cost CA$15/mo
js.intercomcdn.com
Other
Costly
Execution 558ms
Transfer 193 KB
Unused 72%
Monthly Cost CA$8/mo
Google Tag Manager
Tag Manager
Costly
Execution 287ms
Transfer 130 KB
Unused 46%
Monthly Cost CA$4/mo
s-cdn.anthropic.com
Other
Optional
Execution 195ms
Transfer 20 KB
Monthly Cost CA$3/mo
Facebook Pixel
Advertising
Optional
Execution 193ms
Transfer 97 KB
Unused 44%
Monthly Cost CA$3/mo
a-cdn.anthropic.com
Other
Optional
Execution 136ms
Transfer 22 KB
Monthly Cost CA$2/mo
Facebook Pixel
Advertising
Optional
Execution 87ms
Transfer 39 KB
Monthly Cost CA$1/mo
accounts.google.com
Other
Optional
Execution 64ms
Transfer 96 KB
Unused 75%
Monthly Cost CA$1/mo
js.intercomcdn.com
Other
Optional
Execution 62ms
Transfer 144 KB
Unused 64%
Monthly Cost CA$1/mo
assets-proxy.anthropic.com
Other
Optional
Execution 60ms
Transfer 72 KB
Monthly Cost CA$1/mo
a-cdn.anthropic.com
Other
Optional
Execution 51ms
Transfer 29 KB
Monthly Cost CA$1/mo

These scripts may cost more than they're worth

  • assets-proxy.anthropic.com adds 3056ms and costs ~CA$42/month
  • Unattributable adds 2106ms and costs ~CA$29/month
  • assets-proxy.anthropic.com adds 1606ms and costs ~CA$22/month
  • a-cdn.claude.ai adds 1120ms and costs ~CA$15/month
  • js.intercomcdn.com adds 558ms and costs ~CA$8/month
  • Google Tag Manager adds 287ms 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 3056ms 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 2106ms 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 1606ms 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 1120ms 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

js.intercomcdn.com takes 558ms 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

72% 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

Google Tag Manager takes 287ms 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

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

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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