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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.
92
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.

4.26 s

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

18.24 s

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

1.08 s

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

0.067

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

7.62 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.

23.46 s

Page Load Progression

387 ms
775 ms
1.2 s
1.6 s
1.9 s
2.3 s
2.7 s
3.1 s
Checks
17
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
4.1 MB transferred, 65 requests
FIX
4.1 MB transferred, 65 requests
Critical::
Page weighs 7.5 MB (4.1 MB transferred)
Warning::
Images are 2.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.4 MB
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
CSS is 238 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 238 KB
Info::
65 HTTP requests
Info::
Estimated 0.86 g CO2 per page load
4.1 MB / 2.4 MB budget
4.1 MB transferred
65 requests
0.86 g CO2 per page load
Images 2.4 MiB 58%
JavaScript 1.3 MiB 31%
CSS 237.6 KiB 6%
Fonts 197.8 KiB 5%
HTML 21.7 KiB 1%
Other 6.5 KiB 0%
Other 1.1 KiB 0%
Other 596 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (4.1 MiB of 4.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5235ms total JS execution
FIX
5235ms total JS execution
Warning::
https://www.uspto.gov/sites/default/files/js/js_uy...: 2021ms CPU time
Warning::
https://www.uspto.gov/: 736ms CPU time
Warning::
Unattributable: 495ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5D5...: 478ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CD30...: 323ms CPU time
Warning::
Third-party scripts: 5235ms (100% of total)

Main Thread Breakdown

Script Evaluation 63% Other 11% Style & Layout 10% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://www.uspto.gov/sites/default/files/js/js_uyBaW_j32SIzOAuifVAGlbsr4_5C-q1BrrjLimRWWW4.js?scope=header&delta=1&language=en&theme=uspto_ds&include=eJx9kFGOwyAMRC_Ehq-eB7ngEhQHkO20ye2XVLDbVqv9Yvw8Ghj8ghdfiKAK2iEUd3W7Mhi_YEha-OIiFRHgQyHaQX-gY8wB2fjCaANvFWi6FV5NC6KUl8H6aG4lKzxQyor2RU9yj__tJpnTajapWhyE4NrhgdrVwPZPOryErGLvCR-djAZWPKeqH9SlFSI6SnHWa9ntU7gI1HKO7g1iW_sr0Jfo0UrFziNmZKD2l-3pXl1AhUQfy7dpOgNQumU-e__KTlOLc5W2mLI9tXwDM6Ov-Q2021ms2013ms1ms3rd
https://www.uspto.gov/736ms7ms1ms3rd
Unattributable495ms8ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5D5BBD478ms385ms76ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CD30TTEK1F&cx=c&gtm=4e64h1323ms260ms60ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js270ms264ms2ms3rd
https://www.uspto.gov/libraries/fontawesome/js/all.min.js?v=6.4.2261ms48ms197ms3rd
https://www.uspto.gov/sites/default/files/js/js_59308NEp1U_W2hRRrJGk3oUWfx38JGIzzY-DNBwBSak.js?scope=footer&delta=0&language=en&theme=uspto_ds&include=eJx9kFGOwyAMRC_Ehq-eB7ngEhQHkO20ye2XVLDbVqv9Yvw8Ghj8ghdfiKAK2iEUd3W7Mhi_YEha-OIiFRHgQyHaQX-gY8wB2fjCaANvFWi6FV5NC6KUl8H6aG4lKzxQyor2RU9yj__tJpnTajapWhyE4NrhgdrVwPZPOryErGLvCR-djAZWPKeqH9SlFSI6SnHWa9ntU7gI1HKO7g1iW_sr0Jfo0UrFziNmZKD2l-3pXl1AhUQfy7dpOgNQumU-e__KTlOLc5W2mLI9tXwDM6Ov-Q150ms94ms52ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L129ms69ms59ms3rd
https://www.uspto.gov/themes/custom/uspto_ds/js/uspto-scripts.js?tdups2125ms85ms8ms3rd

Showing top 10 of 13 scripts

D
JS Bundles
Action
29 scripts, 377 KB unused
FIX
29 scripts, 377 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 106 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uspto.gov/sites/default/files/js/js_59...: 84 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CD30...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 63 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5D5...: 60 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 377 KB
377 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1147 KB106 KB (72%)✓3rd
https://www.uspto.gov/sites/default/files/js/js_59308NEp1U_W2hRRrJGk3oUWfx38JGIzzY-DNBwBSak.js?scope=footer&delta=0&language=en&theme=uspto_ds&include=eJx9kFGOwyAMRC_Ehq-eB7ngEhQHkO20ye2XVLDbVqv9Yvw8Ghj8ghdfiKAK2iEUd3W7Mhi_YEha-OIiFRHgQyHaQX-gY8wB2fjCaANvFWi6FV5NC6KUl8H6aG4lKzxQyor2RU9yj__tJpnTajapWhyE4NrhgdrVwPZPOryErGLvCR-djAZWPKeqH9SlFSI6SnHWa9ntU7gI1HKO7g1iW_sr0Jfo0UrFziNmZKD2l-3pXl1AhUQfy7dpOgNQumU-e__KTlOLc5W2mLI9tXwDM6Ov-Q106 KB84 KB (80%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CD30TTEK1F&cx=c&gtm=4e64h1155 KB64 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB63 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5D5BBD144 KB60 KB (42%)✓3rd
https://www.uspto.gov/libraries/fontawesome/js/fontawesome.min.js?v=6.4.216 KB—✗3rd
https://www.uspto.gov/modules/custom/uspto_icon_plugin/js/iconathon.js?tdups212 KB—✓3rd
https://www.uspto.gov/themes/custom/uspto_ds/js/uspto-section-landing.js?tdups22 KB—✓3rd
https://www.uspto.gov/themes/custom/uspto_ds/js/uspto-scroll-to-top.js?tdups21 KB—✓3rd
https://www.uspto.gov/themes/custom/uspto_ds/js/jquery.pajinate.js?tdups24 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

D
Page Weight Inventory
Action
65 resources · 4.1 MB · 377 KB savings available
FIX
65 resources · 4.1 MB · 377 KB savings available
Warning::
Page weight 3.1 MB over 1MB target
Got: 4.1 MB Expected: ≤ 1 MB
Info::
~377 KB of savings available
Warning::
64 third-party resources (100% of weight)
Info::
2 resources over 200KB
65 resources · 4.1 MiB · 64 third-party 3.1 MiB over 1MB target
Image 58% · 2.4 MiB
JavaScript 31% · 1.3 MiB
CSS 6% · 237.6 KiB
Font 5% · 197.8 KiB
Document 1% · 21.7 KiB
Other 0% · 1.8 KiB

~376.7 KiB of savings available

Remove unused JavaScript: 376.7 KiB
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
Image Optimization
Action
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
https://www.uspto.gov/sites/default/files/styles/m... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uspto.gov/sites/default/files/styles/m... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uspto.gov/themes/custom/uspto_ds/img/u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uspto.gov/sites/default/files/styles/m... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uspto.gov/sites/default/files/styles/m... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uspto.gov/sites/default/files/joi-lead... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 2.4 MB
0 oversized -0 KB
11 legacy format
6 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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
4 fonts (198 KB)
PASS
4 fonts (198 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

198 KB total

Render-blocking

0

of 4

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 FCP 4.3 s LCP 18.2 shttps://www.uspto.gov/themes/custom/uspto_ds/fonts/public-sans/PublicSans-SemiBold.woff2PublicSans-SemiBold.woff2 https://www.uspto.gov/themes/custom/uspto_ds/fonts/public-sans/PublicSans-SemiBold.woff2 — 33.0 KiB — 443 ms — font-display: swaphttps://www.uspto.gov/themes/custom/uspto_ds/icons/material-icons/MaterialIcons-Regular.woff2MaterialIcons-Regular.w... https://www.uspto.gov/themes/custom/uspto_ds/icons/material-icons/MaterialIcons-Regular.woff2 — 99.1 KiB — 437 ms — font-display: swaphttps://www.uspto.gov/themes/custom/uspto_ds/fonts/public-sans/PublicSans-Bold.woff2PublicSans-Bold.woff2 https://www.uspto.gov/themes/custom/uspto_ds/fonts/public-sans/PublicSans-Bold.woff2 — 32.8 KiB — 392 ms — font-display: swaphttps://www.uspto.gov/themes/custom/uspto_ds/fonts/public-sans/PublicSans-Regular.woff2PublicSans-Regular.woff2 https://www.uspto.gov/themes/custom/uspto_ds/fonts/public-sans/PublicSans-Regular.woff2 — 33.0 KiB — 351 ms — font-display: swap
PublicSans-SemiBold.woff2 woff2 swap
Size 33 KB
Load time 443 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
MaterialIcons-Regular.w... woff2 swap
Size 99 KB
Load time 437 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold.woff2 woff2 swap
Size 33 KB
Load time 392 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
PublicSans-Regular.woff2 woff2 swap
Size 33 KB
Load time 351 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
65 requests over 7154ms
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 FCP 4.3 s LCP 18.2 shttps://uspto.gov// https://uspto.gov/ — 301 — 93 B — 15 ms — h2https://www.uspto.gov/www.uspto.gov/ https://www.uspto.gov/ — 200 — 21.7 KiB — 884 ms — h2https://www.uspto.gov/sites/default/files/css/css_n3RYwHt1BwEO_oyDi1gCR5k0uglbDOga9XkggT8smXw.css?delta=0&language=en&theme=uspto_ds&include=eJxtUFuOxCAMu1C3ORIKENGo4SECu9M9_TJTqnlof8B2HMmO28lzy9Vw8pSalex2eMGLE1Q9wKLShSOpYiC9eMp-zHKlgWpE4V9axj63w1C05MFhaZzTQrcmnHbwtReUddKlYMVQsWx6TZ7K2lPpVlg38ose2iieWbqWlg16b8bnUCh5rPCvOr1uVgV1lUv7UA3H0ckIh63ZfIMHMAFFqB7T6xWCZIvype0Y0cPUAyWqKPDG1rtnHOkUtxwJnnCq7HIyRXrgBHd8ubXbM-S42ln3m-lH4fGuMfsu9Adfjq_Nwww.uspto.gov/sites/default/files/c... https://www.uspto.gov/sites/default/files/css/css_n3RYwHt1BwEO_oyDi1gCR5k0uglbDOga9XkggT8smXw.css?delta=0&language=en&theme=uspto_ds&include=eJxtUFuOxCAMu1C3ORIKENGo4SECu9M9_TJTqnlof8B2HMmO28lzy9Vw8pSalex2eMGLE1Q9wKLShSOpYiC9eMp-zHKlgWpE4V9axj63w1C05MFhaZzTQrcmnHbwtReUddKlYMVQsWx6TZ7K2lPpVlg38ose2iieWbqWlg16b8bnUCh5rPCvOr1uVgV1lUv7UA3H0ckIh63ZfIMHMAFFqB7T6xWCZIvype0Y0cPUAyWqKPDG1rtnHOkUtxwJnnCq7HIyRXrgBHd8ubXbM-S42ln3m-lH4fGuMfsu9Adfjq_N — 200 — 14.9 KiB — 518 ms — h2https://www.uspto.gov/sites/default/files/css/css_z91eArNdVHJUpbFrK_1ZxoMlroy87jnVzRVz1vQUpLw.css?delta=1&language=en&theme=uspto_ds&include=eJxtUFuOxCAMu1C3ORIKENGo4SECu9M9_TJTqnlof8B2HMmO28lzy9Vw8pSalex2eMGLE1Q9wKLShSOpYiC9eMp-zHKlgWpE4V9axj63w1C05MFhaZzTQrcmnHbwtReUddKlYMVQsWx6TZ7K2lPpVlg38ose2iieWbqWlg16b8bnUCh5rPCvOr1uVgV1lUv7UA3H0ckIh63ZfIMHMAFFqB7T6xWCZIvype0Y0cPUAyWqKPDG1rtnHOkUtxwJnnCq7HIyRXrgBHd8ubXbM-S42ln3m-lH4fGuMfsu9Adfjq_Nwww.uspto.gov/sites/default/files/c... https://www.uspto.gov/sites/default/files/css/css_z91eArNdVHJUpbFrK_1ZxoMlroy87jnVzRVz1vQUpLw.css?delta=1&language=en&theme=uspto_ds&include=eJxtUFuOxCAMu1C3ORIKENGo4SECu9M9_TJTqnlof8B2HMmO28lzy9Vw8pSalex2eMGLE1Q9wKLShSOpYiC9eMp-zHKlgWpE4V9axj63w1C05MFhaZzTQrcmnHbwtReUddKlYMVQsWx6TZ7K2lPpVlg38ose2iieWbqWlg16b8bnUCh5rPCvOr1uVgV1lUv7UA3H0ckIh63ZfIMHMAFFqB7T6xWCZIvype0Y0cPUAyWqKPDG1rtnHOkUtxwJnnCq7HIyRXrgBHd8ubXbM-S42ln3m-lH4fGuMfsu9Adfjq_N — 200 — 5.0 KiB — 463 ms — h2https://www.uspto.gov/themes/custom/uspto_ds/css/uspto.theme.min.css?tdups2www.uspto.gov/themes/custom/uspto_d... https://www.uspto.gov/themes/custom/uspto_ds/css/uspto.theme.min.css?tdups2 — 200 — 56.7 KiB — 865 ms — h2https://www.uspto.gov/themes/custom/uspto_ds/css/uspto-icons.css?tdups2www.uspto.gov/themes/custom/uspto_d... https://www.uspto.gov/themes/custom/uspto_ds/css/uspto-icons.css?tdups2 — 200 — 56.5 KiB — 768 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
100% of JavaScript execution is third-party
First-party Third-party 5235ms · 1221KB · €57/mo
www.uspto.gov
Other
Costly
Execution 2021ms
Transfer 4 KB
Monthly Cost €22/mo
www.uspto.gov
Other
Costly
Execution 736ms
Transfer 22 KB
Monthly Cost €8/mo
Unattributable
Other
Costly
Execution 495ms
Transfer 0 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 478ms
Transfer 144 KB
Unused 42%
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 323ms
Transfer 155 KB
Unused 41%
Monthly Cost €4/mo
dap.digitalgov.gov
Other
Costly
Execution 270ms
Transfer 4 KB
Monthly Cost €3/mo
www.uspto.gov
Other
Costly
Execution 261ms
Transfer 440 KB
Monthly Cost €3/mo
www.uspto.gov
Other
Optional
Execution 150ms
Transfer 106 KB
Unused 80%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 129ms
Transfer 147 KB
Unused 43%
Monthly Cost €1/mo
www.uspto.gov
Other
Optional
Execution 125ms
Transfer 15 KB
Monthly Cost €1/mo
www.uspto.gov
Other
Optional
Execution 109ms
Transfer 28 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 86ms
Transfer 147 KB
Unused 72%
Monthly Cost €1/mo
components.uspto.gov
Other
Optional
Execution 52ms
Transfer 9 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.uspto.gov adds 2021ms and costs ~€22/month
  • www.uspto.gov adds 736ms and costs ~€8/month
  • Unattributable adds 495ms and costs ~€5/month
  • Google Tag Manager adds 478ms and costs ~€5/month
  • Google Tag Manager adds 323ms and costs ~€4/month
  • dap.digitalgov.gov adds 270ms and costs ~€3/month
  • www.uspto.gov adds 261ms and costs ~€3/month

100% 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

www.uspto.gov takes 2021ms 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

www.uspto.gov takes 736ms 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 495ms 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

Google Tag Manager takes 478ms 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

Google Tag Manager takes 323ms 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

dap.digitalgov.gov takes 270ms 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

www.uspto.gov takes 261ms 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

80% of www.uspto.gov'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

72% of Google Tag Manager'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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