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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
55
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

2.37 s

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

5.91 s

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

173 ms

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

0.005

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.

6.25 s

Page Load Progression

421 ms
842 ms
1.3 s
1.7 s
2.1 s
2.5 s
2.9 s
3.4 s
Checks
15
6 PASS 2 REVIEW 5 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 197.9 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
D
JS Bundles
Action
29 scripts, 375 KB unused
FIX
29 scripts, 375 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...: 63 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5D5...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 375 KB
375 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 KB63 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5D5BBD144 KB60 KB (41%)✓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 · 375 KB savings available
FIX
65 resources · 4.1 MB · 375 KB savings available
Warning::
Page weight 3.1 MB over 1MB target
Got: 4.1 MB Expected: ≤ 1 MB
Info::
~375 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% · 197.9 KiB
Document 1% · 21.7 KiB
Other 0% · 1.8 KiB

~375.3 KiB of savings available

Remove unused JavaScript: 375.3 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/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/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

C
JS Execution Cost
Action
1368ms total JS execution
REVIEW
1368ms total JS execution
Warning::
https://www.uspto.gov/sites/default/files/js/js_uy...: 699ms CPU time
Info::
https://www.uspto.gov/: 180ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5D5...: 138ms CPU time
Info::
Unattributable: 109ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CD30...: 92ms CPU time
Warning::
Third-party scripts: 1368ms (100% of total)

Main Thread Breakdown

Script Evaluation 69% Style & Layout 9% Script Parsing & Compilation 9% Other 9%
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-Q699ms697ms0ms3rd
https://www.uspto.gov/180ms2ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5D5BBD138ms113ms20ms3rd
Unattributable109ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CD30TTEK1F&cx=c&gtm=4e64h192ms76ms15ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L88ms67ms20ms3rd
https://www.uspto.gov/libraries/fontawesome/js/all.min.js?v=6.4.261ms12ms44ms3rd
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.4 s LCP 5.9 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 — 994 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 — 993 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 — 993 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 — 718 ms — font-display: swap
PublicSans-SemiBold.woff2 woff2 swap
Size 33 KB
Load time 994 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
PublicSans-Regular.woff2 woff2 swap
Size 33 KB
Load time 993 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
MaterialIcons-Regular.w... woff2 swap
Size 99 KB
Load time 993 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold.woff2 woff2 swap
Size 33 KB
Load time 718 ms
Start 1.7 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+
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 5869ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.4 s LCP 5.9 shttps://uspto.gov// https://uspto.gov/ — 301 — 94 B — 17 ms — h2https://www.uspto.gov/www.uspto.gov/ https://www.uspto.gov/ — 200 — 21.7 KiB — 794 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 — 499 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 — 509 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 — 466 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 — 628 ms — h2https://www.uspto.gov/themes/custom/uspto_ds/css/supp-min.css?tdups2www.uspto.gov/themes/custom/uspto_d... https://www.uspto.gov/themes/custom/uspto_ds/css/supp-min.css?tdups2 — 200 — 1.2 KiB — 809 ms — h2https://www.uspto.gov/themes/custom/uspto_ds/css/colorbox.css?tdups2www.uspto.gov/themes/custom/uspto_d... https://www.uspto.gov/themes/custom/uspto_ds/css/colorbox.css?tdups2 — 200 — 2.4 KiB — 635 ms — h2https://www.uspto.gov/themes/custom/uspto_ds/css/usptostrap.v3.min.css?tdups2www.uspto.gov/themes/custom/uspto_d... https://www.uspto.gov/themes/custom/uspto_ds/css/usptostrap.v3.min.css?tdups2 — 200 — 101.0 KiB — 806 ms — h2https://www.uspto.gov/core/assets/vendor/jquery/jquery.min.js?v=4.0.0www.uspto.gov/core/assets/vendor/jq... https://www.uspto.gov/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 — 200 — 28.1 KiB — 717 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 1368ms · 911KB · €15/mo
www.uspto.gov
Other
Costly
Execution 699ms
Transfer 4 KB
Monthly Cost €8/mo
www.uspto.gov
Other
Optional
Execution 180ms
Transfer 22 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 138ms
Transfer 144 KB
Unused 41%
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 109ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 92ms
Transfer 155 KB
Unused 41%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 88ms
Transfer 147 KB
Unused 42%
Monthly Cost €1/mo
www.uspto.gov
Other
Optional
Execution 61ms
Transfer 440 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.uspto.gov adds 699ms and costs ~€8/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 699ms 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

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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