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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
97
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
79
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.

974 ms

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

1.05 s

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

10 ms

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

0.002

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

1.05 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.

2.11 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
7 PASS 3 REVIEW 3 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 (1.1 MiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
21 scripts, 431 KB unused
FIX
21 scripts, 431 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.federalregister.gov/assets/vendor-f856...: 84 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-EDYG...: 64 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-176...: 62 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 61 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 431 KB
431 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.federalregister.gov/assets/vendor-f85646c5f313ac76ccdb22b09e7f5747049d66ceb43f0de1429435f5288a2f59.js117 KB84 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-EDYG1V6520&cx=c&gtm=4e64h1160 KB64 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-17607887-1117 KB62 KB (53%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB61 KB (41%)✓3rd
https://www.federalregister.gov/assets/application_pipeline-f6855aab2a4f8536c61b97d1045b3a444ce1e52deec7258fb1997d03dbb3f7db.js40 KB31 KB (79%)✓3rd
https://www.federalregister.gov/assets/turbo.min-d6bfc462b5848d5a21257bb526cac71836a03d068ae55bccb90766cc2fe34041.js28 KB24 KB (86%)✓3rd
https://www.federalregister.gov/assets/controllers/placeholder_controller-154980092e9132ec1eb5598b86e488ae77b4d49a5e20f069414322e9ee8bb6ab.js1 KB—✓3rd
https://www.federalregister.gov/assets/controllers/application-3a7bc584aa712aeffe79ad21621bf15412bc6c60905abe5cd1b28605cc355294.js1 KB—✓3rd
https://www.federalregister.gov/assets/controllers/pagination_controller-0a88e5be2bbe02085cf076e2ac14804f7cbfa025f2a9393e08c002cf4208607c.js2 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
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.

B
Page Weight Budget
1.1 MB transferred, 41 requests
REVIEW
1.1 MB transferred, 41 requests
Info::
Page weighs 3.8 MB (1.1 MB transferred)
Warning::
JavaScript is 811 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 811 KB
Info::
41 HTTP requests
Info::
Estimated 0.23 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
41 requests
0.23 g CO2 per page load
JavaScript 811.4 KiB 71%
Fonts 111.2 KiB 10%
Images 105.5 KiB 9%
CSS 75.4 KiB 7%
Other 19.6 KiB 2%
HTML 13.3 KiB 1%
Other 2.6 KiB 0%
Other 603 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

C
Page Weight Inventory
Action
41 resources · 1.1 MB · 431 KB savings available
REVIEW
41 resources · 1.1 MB · 431 KB savings available
Warning::
Page weight 115 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~431 KB of savings available
Warning::
40 third-party resources (100% of weight)
41 resources · 1.1 MiB · 40 third-party 115.5 KiB over 1MB target
JavaScript 71% · 811.4 KiB
Image 11% · 124.9 KiB
Font 10% · 111.2 KiB
CSS 7% · 75.4 KiB
Document 1% · 13.4 KiB
Other 0% · 3.2 KiB

~431.2 KiB of savings available

Remove unused JavaScript: 431.2 KiB
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
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 105 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
369ms total JS execution
PASS
369ms total JS execution
Info::
https://www.federalregister.gov/: 92ms CPU time
Info::
Unattributable: 88ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-EDYG...: 72ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 66ms CPU time
Info::
https://www.federalregister.gov/assets/vendor-f856...: 50ms CPU time
Warning::
Third-party scripts: 369ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 18% Style & Layout 17% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://www.federalregister.gov/92ms1ms1ms3rd
Unattributable88ms10ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-EDYG1V6520&cx=c&gtm=4e64h172ms60ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L66ms53ms9ms3rd
https://www.federalregister.gov/assets/vendor-f85646c5f313ac76ccdb22b09e7f5747049d66ceb43f0de1429435f5288a2f59.js50ms37ms9ms3rd
A+
Font Loading
4 fonts (111 KB)
PASS
4 fonts (111 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

111 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 FCP 974 ms LCP 1.0 shttps://www.federalregister.gov/assets/fr2_icons/fr2_icons-b739c7d4edb8ce7faf77891743fe75e6c315576adb25d7ccd49f42f2ddc8f8a3.woff2fr2_icons-b739c7d4edb8c... https://www.federalregister.gov/assets/fr2_icons/fr2_icons-b739c7d4edb8ce7faf77891743fe75e6c315576adb25d7ccd49f42f2ddc8f8a3.woff2 — 17.4 KiB — 142 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 54 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 — 61 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2 — 16.3 KiB — 37 ms — font-display: swap
fr2_icons-b739c7d4edb8c... woff2 swap
Size 17 KB
Load time 142 ms
Start 727 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 54 ms
Start 727 ms
Risk FOUT — text flashes from fallback to web font
KFO5CnqEu92Fr1Mu53ZEC9_... woff2 swap
Size 41 KB
Load time 61 ms
Start 727 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 16 KB
Load time 37 ms
Start 728 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
41 requests over 1348ms
INFO
0 ms 500 ms 1.0 s FCP 974 ms LCP 1.0 shttps://federalregister.gov// https://federalregister.gov/ — 301 — 134 B — 309 ms — h2https://www.federalregister.gov/www.federalregister.gov/ https://www.federalregister.gov/ — 200 — 13.3 KiB — 114 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 — 78 ms — h2https://www.federalregister.gov/assets/vendor-eb100195f777040f710b702257d7c3e4d84f545f4ef0885be8413a081cddfcf5.csswww.federalregister.gov/assets/vend... https://www.federalregister.gov/assets/vendor-eb100195f777040f710b702257d7c3e4d84f545f4ef0885be8413a081cddfcf5.css — 200 — 25.3 KiB — 114 ms — h2https://www.federalregister.gov/assets/application-2e402d2fd2374feafca5b5ff4298d8fea16e65342e8fcd1b6d160fd92699c479.csswww.federalregister.gov/assets/appl... https://www.federalregister.gov/assets/application-2e402d2fd2374feafca5b5ff4298d8fea16e65342e8fcd1b6d160fd92699c479.css — 200 — 43.2 KiB — 228 ms — h2https://www.federalregister.gov/assets/application-823974c713c3a3924ae85d8de70cc2e58a1e7124125f29cd3ceae1345678e684.jswww.federalregister.gov/assets/appl... https://www.federalregister.gov/assets/application-823974c713c3a3924ae85d8de70cc2e58a1e7124125f29cd3ceae1345678e684.js — 200 — 355 B — 226 ms — h2https://www.federalregister.gov/assets/stimulus.min-716bd9ba81743f197ff9159292472d9ab8c89bdd671f80f5d8a4c0d13f8a0d2d.jswww.federalregister.gov/assets/stim... https://www.federalregister.gov/assets/stimulus.min-716bd9ba81743f197ff9159292472d9ab8c89bdd671f80f5d8a4c0d13f8a0d2d.js — 200 — 11.0 KiB — 219 ms — h2https://www.federalregister.gov/assets/stimulus-loading-b4e8c71c6e3c1180a18517670d3626e09d2d359d5e3fb8cdc063471fb259d6c2.jswww.federalregister.gov/assets/stim... https://www.federalregister.gov/assets/stimulus-loading-b4e8c71c6e3c1180a18517670d3626e09d2d359d5e3fb8cdc063471fb259d6c2.js — 200 — 1.0 KiB — 111 ms — h2https://www.federalregister.gov/assets/stimulus-autocomplete-55ff98abce29d577d52c13ebc70c409ae1baf90178875646e57aa296d30e1c82.jswww.federalregister.gov/assets/stim... https://www.federalregister.gov/assets/stimulus-autocomplete-55ff98abce29d577d52c13ebc70c409ae1baf90178875646e57aa296d30e1c82.js — 200 — 2.1 KiB — 214 ms — h2https://www.federalregister.gov/assets/turbo.min-d6bfc462b5848d5a21257bb526cac71836a03d068ae55bccb90766cc2fe34041.jswww.federalregister.gov/assets/turb... https://www.federalregister.gov/assets/turbo.min-d6bfc462b5848d5a21257bb526cac71836a03d068ae55bccb90766cc2fe34041.js — 200 — 28.1 KiB — 214 ms — h2https://www.federalregister.gov/assets/controllers/application-3a7bc584aa712aeffe79ad21621bf15412bc6c60905abe5cd1b28605cc355294.jswww.federalregister.gov/assets/cont... https://www.federalregister.gov/assets/controllers/application-3a7bc584aa712aeffe79ad21621bf15412bc6c60905abe5cd1b28605cc355294.js — 200 — 966 B — 210 ms — h2https://www.federalregister.gov/assets/controllers/hello_controller-5e545fa92cdc41ea2e6870cfbea018726fae4680ea0a8820832957dbdd46d65f.jswww.federalregister.gov/assets/cont... https://www.federalregister.gov/assets/controllers/hello_controller-5e545fa92cdc41ea2e6870cfbea018726fae4680ea0a8820832957dbdd46d65f.js — 200 — 423 B — 219 ms — h2https://www.federalregister.gov/assets/controllers/index-d3bed66b3a37b8fb69ca3314e202b85db13e3b837c8fb5657366f5aadec7c851.jswww.federalregister.gov/assets/cont... https://www.federalregister.gov/assets/controllers/index-d3bed66b3a37b8fb69ca3314e202b85db13e3b837c8fb5657366f5aadec7c851.js — 200 — 410 B — 220 ms — h2https://www.federalregister.gov/assets/controllers/modal_controller-f2aa8b46e6d18351f9edad448eea6d8925d84d7e8751a4e4de1567e9458d269e.jswww.federalregister.gov/assets/cont... https://www.federalregister.gov/assets/controllers/modal_controller-f2aa8b46e6d18351f9edad448eea6d8925d84d7e8751a4e4de1567e9458d269e.js — 200 — 466 B — 217 ms — h2https://www.federalregister.gov/assets/controllers/pagination_controller-0a88e5be2bbe02085cf076e2ac14804f7cbfa025f2a9393e08c002cf4208607c.jswww.federalregister.gov/assets/cont... https://www.federalregister.gov/assets/controllers/pagination_controller-0a88e5be2bbe02085cf076e2ac14804f7cbfa025f2a9393e08c002cf4208607c.js — 200 — 1.5 KiB — 224 ms — h2https://www.federalregister.gov/assets/controllers/placeholder_controller-154980092e9132ec1eb5598b86e488ae77b4d49a5e20f069414322e9ee8bb6ab.jswww.federalregister.gov/assets/cont... https://www.federalregister.gov/assets/controllers/placeholder_controller-154980092e9132ec1eb5598b86e488ae77b4d49a5e20f069414322e9ee8bb6ab.js — 200 — 577 B — 209 ms — h2https://www.federalregister.gov/assets/controllers/suggestions_controller-048988c8ce31e76c5cc5391152470c08a8c474e5b911cbbf517476def1407009.jswww.federalregister.gov/assets/cont... https://www.federalregister.gov/assets/controllers/suggestions_controller-048988c8ce31e76c5cc5391152470c08a8c474e5b911cbbf517476def1407009.js — 200 — 1.6 KiB — 213 ms — h2https://www.federalregister.gov/assets/fr-mastheads-a7ee26edd10e0a6100e46528d420e4217b1254e8241a6de1fd2647c4a3878d86.svgwww.federalregister.gov/assets/fr-m... https://www.federalregister.gov/assets/fr-mastheads-a7ee26edd10e0a6100e46528d420e4217b1254e8241a6de1fd2647c4a3878d86.svg — 200 — 102.2 KiB — 114 ms — h2https://www.federalregister.gov/assets/vendor-f85646c5f313ac76ccdb22b09e7f5747049d66ceb43f0de1429435f5288a2f59.jswww.federalregister.gov/assets/vend... https://www.federalregister.gov/assets/vendor-f85646c5f313ac76ccdb22b09e7f5747049d66ceb43f0de1429435f5288a2f59.js — 200 — 116.6 KiB — 205 ms — h2https://www.federalregister.gov/assets/application_pipeline-f6855aab2a4f8536c61b97d1045b3a444ce1e52deec7258fb1997d03dbb3f7db.jswww.federalregister.gov/assets/appl... https://www.federalregister.gov/assets/application_pipeline-f6855aab2a4f8536c61b97d1045b3a444ce1e52deec7258fb1997d03dbb3f7db.js — 200 — 39.8 KiB — 204 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-17607887-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-17607887-1 — 200 — 116.9 KiB — 142 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 — 13 ms — h3https://www.federalregister.gov/assets/print-d9e428c56a737f652f71b10e6f53d0c4bf5f7ba81c1b98de5ffcddd41dbab61f.csswww.federalregister.gov/assets/prin... https://www.federalregister.gov/assets/print-d9e428c56a737f652f71b10e6f53d0c4bf5f7ba81c1b98de5ffcddd41dbab61f.css — 200 — 4.1 KiB — 199 ms — h2https://www.federalregister.gov/assets/fr-icons-9d2306298f2aef758af4494a9e124d5a5239ed24836350c29d204e002cfe8bba.svgwww.federalregister.gov/assets/fr-i... https://www.federalregister.gov/assets/fr-icons-9d2306298f2aef758af4494a9e124d5a5239ed24836350c29d204e002cfe8bba.svg — 200 — 14.8 KiB — 197 ms — h2https://www.federalregister.gov/assets/fr-mastheads-a7ee26edd10e0a6100e46528d420e4217b1254e8241a6de1fd2647c4a3878d86.svgwww.federalregister.gov/assets/fr-m... https://www.federalregister.gov/assets/fr-mastheads-a7ee26edd10e0a6100e46528d420e4217b1254e8241a6de1fd2647c4a3878d86.svg — 200 — 0 B — 105 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 369ms · 437KB · $5/mo
www.federalregister.gov
Other
Optional
Execution 92ms
Transfer 13 KB
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 88ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 72ms
Transfer 160 KB
Unused 40%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 66ms
Transfer 147 KB
Unused 41%
Monthly Cost $1/mo
www.federalregister.gov
Other
Optional
Execution 50ms
Transfer 117 KB
Unused 72%
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

72% of www.federalregister.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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