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https://ecfr.gov

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
2
REVIEW
4
PASS
9
INFO
2

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

Mobile Desktop
56
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.

4.53 s

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

7.65 s

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

350 ms

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

0.011

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

4.59 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.

7.66 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
9 PASS 4 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 Execution Cost
Action
1250ms total JS execution
REVIEW
1250ms total JS execution
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 255ms CPU time
Info::
https://www.ecfr.gov/: 248ms CPU time
Info::
https://www.ecfr.gov/assets/application_pipeline-6...: 246ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-K7SM...: 236ms CPU time
Info::
Unattributable: 189ms CPU time
Warning::
Third-party scripts: 1250ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 18% Style & Layout 15% Script Parsing & Compilation 10% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L255ms219ms35ms3rd
https://www.ecfr.gov/248ms3ms1ms3rd
https://www.ecfr.gov/assets/application_pipeline-663de460294af3b3ad00c383d07d76da24728a5f41ac997c972e058ba0cbbdd4.js246ms146ms44ms3rd
https://www.googletagmanager.com/gtag/js?id=G-K7SMYBYX81&cx=c&gtm=4e64h1236ms188ms48ms3rd
Unattributable189ms20ms0ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js74ms72ms1ms3rd
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% · 542.3 KiB
Font 14% · 108.8 KiB
CSS 7% · 52.3 KiB
Image 5% · 40.7 KiB
Document 2% · 12.0 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 542.3 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+
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 4.5 s LCP 7.7 shttps://www.ecfr.gov/assets/ecfr_icons-a3eb15e73902be4e6c8ecabcce9332b0e227df202922ad0463e90ca328dc786a.woff2ecfr_icons-a3eb15e73902... https://www.ecfr.gov/assets/ecfr_icons-a3eb15e73902be4e6c8ecabcce9332b0e227df202922ad0463e90ca328dc786a.woff2 — 15.0 KiB — 128 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 63 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 — 63 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2 — 16.3 KiB — 61 ms — font-display: swap
ecfr_icons-a3eb15e73902... woff2 swap
Size 15 KB
Load time 128 ms
Start 596 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 63 ms
Start 600 ms
Risk FOUT — text flashes from fallback to web font
KFO5CnqEu92Fr1Mu53ZEC9_... woff2 swap
Size 41 KB
Load time 63 ms
Start 600 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 16 KB
Load time 61 ms
Start 600 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
2
preload
1
dns-prefetch
—
prefetch
—

3 resource hints configured

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
42 requests over 1052ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 4.5 s LCP 7.7 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 — 113 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 — 107 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 — 105 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 — 107 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 — 201 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 — 97 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 — 209 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 — 35 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 — 199 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 — 197 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 — 199 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 — 165 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 — 211 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 — 200 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 — 199 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 — 204 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 — 205 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 — 202 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 — 208 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 — 200 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 — 211 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 — 209 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 — 215 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 — 212 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 — 211 ms — h2https://www.ecfr.gov/assets/controllers/timeline_controller-28828c3d426020d2efa340b62988d9b8061f8c80a78ab8653d7e9e6952a651a2.jswww.ecfr.gov/assets/controllers/tim... https://www.ecfr.gov/assets/controllers/timeline_controller-28828c3d426020d2efa340b62988d9b8061f8c80a78ab8653d7e9e6952a651a2.js — 200 — 1.1 KiB — 216 ms — h2https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=NARA&subagency=fedregdap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=NARA&subagency=fedreg — 200 — 9.4 KiB — 50 ms — h3https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.jsdap.digitalgov.gov/web-vitals/dist/... https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js — 200 — 4.5 KiB — 6 ms — h3https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4Lwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L — 200 — 147.5 KiB — 168 ms — h2
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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 1250ms · 452KB · $17/mo
Google Tag Manager
Tag Manager
Costly
Execution 255ms
Transfer 147 KB
Unused 40%
Monthly Cost $3/mo
www.ecfr.gov
Other
Costly
Execution 248ms
Transfer 12 KB
Monthly Cost $3/mo
www.ecfr.gov
Other
Costly
Execution 246ms
Transfer 133 KB
Unused 74%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 236ms
Transfer 156 KB
Unused 43%
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 189ms
Transfer 0 KB
Monthly Cost $3/mo
dap.digitalgov.gov
Other
Optional
Execution 74ms
Transfer 4 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 255ms and costs ~$3/month
  • www.ecfr.gov adds 248ms and costs ~$3/month
  • www.ecfr.gov adds 246ms and costs ~$3/month
  • Google Tag Manager adds 236ms 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.

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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

Google Tag Manager takes 255ms 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.ecfr.gov takes 248ms 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.ecfr.gov takes 246ms 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

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

Google Tag Manager takes 236ms 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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