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https://ecfr.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
2
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

1.60 s

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

2.54 s

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

0 ms

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

0.022

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

1.60 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.

2.54 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
15
8 PASS 3 REVIEW 2 FIX
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 (757.1 KiB of 757.2 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
JS Bundles
Action
26 scripts, 225 KB unused
REVIEW
26 scripts, 225 KB unused
Warning::
https://www.ecfr.gov/assets/application_pipeline-6...: 99 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-K7SM...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 59 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 225 KB
225 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ecfr.gov/assets/application_pipeline-663de460294af3b3ad00c383d07d76da24728a5f41ac997c972e058ba0cbbdd4.js133 KB99 KB (74%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-K7SMYBYX81&cx=c&gtm=4e64h1156 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB59 KB (40%)✓3rd
https://www.ecfr.gov/assets/controllers/compare_controller-0f0c57b4b09d859dda030c63b56009a432d4976c917e95457077ebafe30b00c3.js1 KB—✓3rd
https://www.ecfr.gov/assets/controllers/form_controller-521a8ae5e19bf25bcf358a35c386589c4ae49399968da815af3e5fedb4e66cad.js1 KB—✓3rd
https://www.ecfr.gov/assets/stimulus-loading-39227295c8a6d71e10ca2a94dede18522ced047f6ccbf8788e926f8be14aff1b.js1 KB—✓3rd
https://ga.jspm.io/npm:lodash.debounce@4.0.8/index.js2 KB—✓3rd
https://www.ecfr.gov/assets/stimulus-autocomplete-8add2720669e9c414c7a0c88e8f841b24850031e013eeb6cb96053f73a68c04a.js2 KB—✓3rd
https://www.ecfr.gov/assets/stimulus-use-face9cf86a3020271b1dad3e7e3b767bc5511992be37486f2f7a0f07fda68f02.js7 KB—✓3rd
https://www.ecfr.gov/assets/controllers/agencies_controller-87ea6a0c00e4786d8f924f584890e4ae1cab1d251fdbbb2ecf6da5d725791da4.js1 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

B
Page Weight Inventory
42 resources · 757 KB · 225 KB savings available
REVIEW
42 resources · 757 KB · 225 KB savings available
Info::
Within 1MB page-weight target
Got: 757 KB
Info::
~225 KB of savings available
Warning::
41 third-party resources (100% of weight)
42 resources · 757.2 KiB · 41 third-party Within 1MB page-weight target
JavaScript 72% · 542.2 KiB
Font 14% · 108.8 KiB
CSS 7% · 52.3 KiB
Image 5% · 40.7 KiB
Document 2% · 11.9 KiB
Other 0% · 1.2 KiB

~225.0 KiB of savings available

Remove unused JavaScript: 225.0 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
757 KB transferred, 42 requests
PASS
757 KB transferred, 42 requests
Info::
Page weighs 2.3 MB (757 KB transferred)
Warning::
JavaScript is 542 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 542 KB
Info::
42 HTTP requests
Info::
Estimated 0.16 g CO2 per page load
757 KB / 2.4 MB budget
757 KB transferred
42 requests
0.16 g CO2 per page load
JavaScript 542.2 KiB 72%
Fonts 108.8 KiB 14%
CSS 52.3 KiB 7%
Images 38.2 KiB 5%
HTML 11.8 KiB 2%
Other 2.7 KiB 0%
Other 618 B 0%
Other 595 B 0%
0 2.4 MB 4.9 MB
Under 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

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
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 38 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
211ms total JS execution
PASS
211ms total JS execution
Info::
https://www.ecfr.gov/: 88ms CPU time
Info::
https://www.ecfr.gov/assets/application_pipeline-6...: 65ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 59ms CPU time
Warning::
Third-party scripts: 211ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Style & Layout 19% Other 17% Script Parsing & Compilation 9% Rendering 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.ecfr.gov/88ms1ms0ms3rd
https://www.ecfr.gov/assets/application_pipeline-663de460294af3b3ad00c383d07d76da24728a5f41ac997c972e058ba0cbbdd4.js65ms37ms15ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L59ms50ms8ms3rd
A+
Font Loading
4 fonts (109 KB)
PASS
4 fonts (109 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

109 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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.6 s LCP 2.5 shttps://www.ecfr.gov/assets/ecfr_icons-a3eb15e73902be4e6c8ecabcce9332b0e227df202922ad0463e90ca328dc786a.woff2ecfr_icons-a3eb15e73902... https://www.ecfr.gov/assets/ecfr_icons-a3eb15e73902be4e6c8ecabcce9332b0e227df202922ad0463e90ca328dc786a.woff2 — 15.0 KiB — 108 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 57 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnkaSTbQWg.woff2KFO5CnqEu92Fr1Mu53ZEC9_... https://fonts.gstatic.com/s/roboto/v51/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnkaSTbQWg.woff2 — 40.8 KiB — 59 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2 — 16.3 KiB — 36 ms — font-display: swap
ecfr_icons-a3eb15e73902... woff2 swap
Size 15 KB
Load time 108 ms
Start 688 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 57 ms
Start 688 ms
Risk FOUT — text flashes from fallback to web font
KFO5CnqEu92Fr1Mu53ZEC9_... woff2 swap
Size 41 KB
Load time 59 ms
Start 688 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 16 KB
Load time 36 ms
Start 688 ms
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
Network Waterfall
42 requests over 1062ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.6 s LCP 2.5 shttps://ecfr.gov// https://ecfr.gov/ — 301 — 126 B — 305 ms — h2https://www.ecfr.gov/www.ecfr.gov/ https://www.ecfr.gov/ — 200 — 11.8 KiB — 109 ms — h2https://www.ecfr.gov/assets/google_analytics-8bb4e86e6ec70a82ecd683b2ce1feac2f8086a691a690d8241ba6bc27fd3ce8c.jswww.ecfr.gov/assets/google_analytic... https://www.ecfr.gov/assets/google_analytics-8bb4e86e6ec70a82ecd683b2ce1feac2f8086a691a690d8241ba6bc27fd3ce8c.js — 200 — 533 B — 206 ms — h2https://www.ecfr.gov/assets/vendor-ed1f17021e0f5e5ba9861e9a88550a0d17aa9657d0832f953e6156a822fe3a1d.csswww.ecfr.gov/assets/vendor-ed1f1702... https://www.ecfr.gov/assets/vendor-ed1f17021e0f5e5ba9861e9a88550a0d17aa9657d0832f953e6156a822fe3a1d.css — 200 — 22.7 KiB — 109 ms — h2https://www.ecfr.gov/assets/application-bd54a6a79171891e3b37ddddbd9f7e9f02c87e5ccc41888395082c8271282dd7.csswww.ecfr.gov/assets/application-bd5... https://www.ecfr.gov/assets/application-bd54a6a79171891e3b37ddddbd9f7e9f02c87e5ccc41888395082c8271282dd7.css — 200 — 25.1 KiB — 204 ms — h2https://www.ecfr.gov/assets/print-e85ef07360cd8210c510308470ec9745d5d7b31065d9007a9d9b6935c561c232.csswww.ecfr.gov/assets/print-e85ef0736... https://www.ecfr.gov/assets/print-e85ef07360cd8210c510308470ec9745d5d7b31065d9007a9d9b6935c561c232.css — 200 — 1.7 KiB — 107 ms — h2https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500;1,700&family=Bitter:ital,wght@0,400;0,500;0,700;1,400;1,500;1,700&display=swapfonts.googleapis.com/css2?family=Ro... https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500;1,700&family=Bitter:ital,wght@0,400;0,500;0,700;1,400;1,500;1,700&display=swap — 200 — 2.8 KiB — 79 ms — h2https://www.ecfr.gov/assets/application-335c9d0168c1b2a3960dd56fdf4f6c209d0eec1942adb72b6441483bed14e77f.jswww.ecfr.gov/assets/application-335... https://www.ecfr.gov/assets/application-335c9d0168c1b2a3960dd56fdf4f6c209d0eec1942adb72b6441483bed14e77f.js — 200 — 348 B — 205 ms — h2https://code.jquery.com/jquery-3.7.1.min.jscode.jquery.com/jquery-3.7.1.min.js https://code.jquery.com/jquery-3.7.1.min.js — 200 — 30.0 KiB — 38 ms — h2https://www.ecfr.gov/assets/turbo.min-6dc97c6c6ae8c434e9b0416c2cd8b1a7d3e36a8ca4b934ec2171323efed40cdd.jswww.ecfr.gov/assets/turbo.min-6dc97... https://www.ecfr.gov/assets/turbo.min-6dc97c6c6ae8c434e9b0416c2cd8b1a7d3e36a8ca4b934ec2171323efed40cdd.js — 200 — 28.2 KiB — 222 ms — h2https://www.ecfr.gov/assets/@hotwired--stimulus-a083ab2b787bc025993dfa720caabfca7a445e29e77eca385f8f6b4500aee6b7.jswww.ecfr.gov/assets/@hotwired--stim... https://www.ecfr.gov/assets/@hotwired--stimulus-a083ab2b787bc025993dfa720caabfca7a445e29e77eca385f8f6b4500aee6b7.js — 200 — 11.5 KiB — 223 ms — h2https://www.ecfr.gov/assets/stimulus-loading-39227295c8a6d71e10ca2a94dede18522ced047f6ccbf8788e926f8be14aff1b.jswww.ecfr.gov/assets/stimulus-loadin... https://www.ecfr.gov/assets/stimulus-loading-39227295c8a6d71e10ca2a94dede18522ced047f6ccbf8788e926f8be14aff1b.js — 200 — 1.1 KiB — 205 ms — h2https://ga.jspm.io/npm:lodash.debounce@4.0.8/index.jsga.jspm.io/npm:lodash.debounce@4.0.... https://ga.jspm.io/npm:lodash.debounce@4.0.8/index.js — 200 — 1.5 KiB — 97 ms — h2https://www.ecfr.gov/assets/stimulus-autocomplete-8add2720669e9c414c7a0c88e8f841b24850031e013eeb6cb96053f73a68c04a.jswww.ecfr.gov/assets/stimulus-autoco... https://www.ecfr.gov/assets/stimulus-autocomplete-8add2720669e9c414c7a0c88e8f841b24850031e013eeb6cb96053f73a68c04a.js — 200 — 2.1 KiB — 219 ms — h2https://www.ecfr.gov/assets/stimulus-use-face9cf86a3020271b1dad3e7e3b767bc5511992be37486f2f7a0f07fda68f02.jswww.ecfr.gov/assets/stimulus-use-fa... https://www.ecfr.gov/assets/stimulus-use-face9cf86a3020271b1dad3e7e3b767bc5511992be37486f2f7a0f07fda68f02.js — 200 — 6.9 KiB — 216 ms — h2https://www.ecfr.gov/assets/controllers/agencies_controller-87ea6a0c00e4786d8f924f584890e4ae1cab1d251fdbbb2ecf6da5d725791da4.jswww.ecfr.gov/assets/controllers/age... https://www.ecfr.gov/assets/controllers/agencies_controller-87ea6a0c00e4786d8f924f584890e4ae1cab1d251fdbbb2ecf6da5d725791da4.js — 200 — 729 B — 212 ms — h2https://www.ecfr.gov/assets/controllers/application-ea371168b49e15df31e33905248b12aa4514fc69b0db9abc4e35e35a5e71288a.jswww.ecfr.gov/assets/controllers/app... https://www.ecfr.gov/assets/controllers/application-ea371168b49e15df31e33905248b12aa4514fc69b0db9abc4e35e35a5e71288a.js — 200 — 1016 B — 208 ms — h2https://www.ecfr.gov/assets/controllers/changes_controller-088eef6c2eab7cda6b3599e0a13eedddeaa68897fb1bf1fd9d557b3075ba1291.jswww.ecfr.gov/assets/controllers/cha... https://www.ecfr.gov/assets/controllers/changes_controller-088eef6c2eab7cda6b3599e0a13eedddeaa68897fb1bf1fd9d557b3075ba1291.js — 200 — 1.0 KiB — 217 ms — h2https://www.ecfr.gov/assets/controllers/compare_controller-0f0c57b4b09d859dda030c63b56009a432d4976c917e95457077ebafe30b00c3.jswww.ecfr.gov/assets/controllers/com... https://www.ecfr.gov/assets/controllers/compare_controller-0f0c57b4b09d859dda030c63b56009a432d4976c917e95457077ebafe30b00c3.js — 200 — 1.2 KiB — 209 ms — h2https://www.ecfr.gov/assets/controllers/element_controller-e3ca2895369ea6bf23150b785d229b5d6684fcfc01dfbb8f5d8227bcb5fe1cb3.jswww.ecfr.gov/assets/controllers/ele... https://www.ecfr.gov/assets/controllers/element_controller-e3ca2895369ea6bf23150b785d229b5d6684fcfc01dfbb8f5d8227bcb5fe1cb3.js — 200 — 628 B — 206 ms — h2https://www.ecfr.gov/assets/controllers/form_controller-521a8ae5e19bf25bcf358a35c386589c4ae49399968da815af3e5fedb4e66cad.jswww.ecfr.gov/assets/controllers/for... https://www.ecfr.gov/assets/controllers/form_controller-521a8ae5e19bf25bcf358a35c386589c4ae49399968da815af3e5fedb4e66cad.js — 200 — 906 B — 209 ms — h2https://www.ecfr.gov/assets/controllers/index-075d84f1ecd1595c9ab3e04d66cb668dc9f6fb81d4809c437cbb0a5c0ec6fce2.jswww.ecfr.gov/assets/controllers/ind... https://www.ecfr.gov/assets/controllers/index-075d84f1ecd1595c9ab3e04d66cb668dc9f6fb81d4809c437cbb0a5c0ec6fce2.js — 200 — 468 B — 204 ms — h2https://www.ecfr.gov/assets/controllers/modal_controller-b9cff36cd77bfb60e03304caa4eecacff19fc3713510141975d9e6f2748ac706.jswww.ecfr.gov/assets/controllers/mod... https://www.ecfr.gov/assets/controllers/modal_controller-b9cff36cd77bfb60e03304caa4eecacff19fc3713510141975d9e6f2748ac706.js — 200 — 478 B — 221 ms — h2https://www.ecfr.gov/assets/controllers/placeholder_controller-db5bbdf7df068e036eb77a730c74a68b59d680045962165deb575098d64ea172.jswww.ecfr.gov/assets/controllers/pla... https://www.ecfr.gov/assets/controllers/placeholder_controller-db5bbdf7df068e036eb77a730c74a68b59d680045962165deb575098d64ea172.js — 200 — 484 B — 224 ms — h2https://www.ecfr.gov/assets/controllers/recent_changes_controller-59c48534f2e0af4774fe28c4c20b5ae8a7877c04bbf4aecd1550dd7decd6f671.jswww.ecfr.gov/assets/controllers/rec... https://www.ecfr.gov/assets/controllers/recent_changes_controller-59c48534f2e0af4774fe28c4c20b5ae8a7877c04bbf4aecd1550dd7decd6f671.js — 200 — 665 B — 201 ms — h2https://www.ecfr.gov/assets/controllers/suggestions_controller-911d643e990caf80f3933d4a47c207118eb2a5fb0e582382abe30e473e38c89b.jswww.ecfr.gov/assets/controllers/sug... https://www.ecfr.gov/assets/controllers/suggestions_controller-911d643e990caf80f3933d4a47c207118eb2a5fb0e582382abe30e473e38c89b.js — 200 — 1.6 KiB — 222 ms — h2https://www.ecfr.gov/assets/controllers/timeline_controller-28828c3d426020d2efa340b62988d9b8061f8c80a78ab8653d7e9e6952a651a2.jswww.ecfr.gov/assets/controllers/tim... 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0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.6 s LCP 2.5 shttps://ecfr.gov// https://ecfr.gov/ — 301 — 126 B — 305 ms — h2https://www.ecfr.gov/www.ecfr.gov/ https://www.ecfr.gov/ — 200 — 11.8 KiB — 109 ms — h2https://www.ecfr.gov/assets/google_analytics-8bb4e86e6ec70a82ecd683b2ce1feac2f8086a691a690d8241ba6bc27fd3ce8c.jswww.ecfr.gov/assets/google_analytic... https://www.ecfr.gov/assets/google_analytics-8bb4e86e6ec70a82ecd683b2ce1feac2f8086a691a690d8241ba6bc27fd3ce8c.js — 200 — 533 B — 206 ms — h2https://www.ecfr.gov/assets/vendor-ed1f17021e0f5e5ba9861e9a88550a0d17aa9657d0832f953e6156a822fe3a1d.csswww.ecfr.gov/assets/vendor-ed1f1702... https://www.ecfr.gov/assets/vendor-ed1f17021e0f5e5ba9861e9a88550a0d17aa9657d0832f953e6156a822fe3a1d.css — 200 — 22.7 KiB — 109 ms — h2https://www.ecfr.gov/assets/application-bd54a6a79171891e3b37ddddbd9f7e9f02c87e5ccc41888395082c8271282dd7.csswww.ecfr.gov/assets/application-bd5... 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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 211ms · 292KB · $3/mo
www.ecfr.gov
Other
Optional
Execution 88ms
Transfer 12 KB
Monthly Cost $1/mo
www.ecfr.gov
Other
Optional
Execution 65ms
Transfer 133 KB
Unused 74%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 59ms
Transfer 147 KB
Unused 40%
Monthly Cost $1/mo

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

74% of www.ecfr.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

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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