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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
3
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
57
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.

4.07 s

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

9.71 s

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

324 ms

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

0.000

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

4.46 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.

9.73 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
8 PASS 4 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, 414 KB unused
FIX
21 scripts, 414 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-176...: 90 KB unused (78%)
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...: 63 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 58 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 414 KB
414 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=UA-17607887-1&cx=c&gtm=4e64h1116 KB90 KB (78%)✓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=4e64k0h2160 KB64 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-17607887-1116 KB63 KB (54%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L148 KB58 KB (39%)✓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 3.7 MB (1.1 MB transferred)
Warning::
JavaScript is 779 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 779 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 779.2 KiB 70%
Fonts 111.2 KiB 10%
Images 105.4 KiB 10%
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
JS Execution Cost
Action
1558ms total JS execution
REVIEW
1558ms total JS execution
Warning::
Unattributable: 372ms CPU time
Warning::
https://www.federalregister.gov/assets/turbo.min-d...: 274ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-EDYG...: 246ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 232ms CPU time
Info::
https://www.federalregister.gov/assets/vendor-f856...: 171ms CPU time
Warning::
Third-party scripts: 1558ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 20% Style & Layout 16% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
Unattributable372ms15ms0ms3rd
https://www.federalregister.gov/assets/turbo.min-d6bfc462b5848d5a21257bb526cac71836a03d068ae55bccb90766cc2fe34041.js274ms51ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-EDYG1V6520&cx=c&gtm=4e64k0h2246ms210ms35ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L232ms193ms38ms3rd
https://www.federalregister.gov/assets/vendor-f85646c5f313ac76ccdb22b09e7f5747049d66ceb43f0de1429435f5288a2f59.js171ms127ms31ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-17607887-198ms74ms23ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js87ms84ms1ms3rd
https://www.federalregister.gov/78ms5ms2ms3rd
B
Page Weight Inventory
41 resources · 1.1 MB · 414 KB savings available
REVIEW
41 resources · 1.1 MB · 414 KB savings available
Warning::
Page weight 83 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~414 KB of savings available
Warning::
40 third-party resources (100% of weight)
41 resources · 1.1 MiB · 40 third-party 83.3 KiB over 1MB target
JavaScript 70% · 779.2 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

~414.2 KiB of savings available

Remove unused JavaScript: 414.2 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+
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.1 s LCP 9.7 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 — 101 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 52 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 — 44 ms — font-display: swap
fr2_icons-b739c7d4edb8c... woff2 swap
Size 17 KB
Load time 101 ms
Start 970 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 52 ms
Start 970 ms
Risk FOUT — text flashes from fallback to web font
KFO5CnqEu92Fr1Mu53ZEC9_... woff2 swap
Size 41 KB
Load time 59 ms
Start 971 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 16 KB
Load time 44 ms
Start 971 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
41 requests over 1419ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.1 s LCP 9.7 shttps://federalregister.gov// https://federalregister.gov/ — 301 — 134 B — 300 ms — h2https://www.federalregister.gov/www.federalregister.gov/ https://www.federalregister.gov/ — 200 — 13.3 KiB — 115 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 — 107 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 — 112 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 — 214 ms — h2https://www.federalregister.gov/assets/application-823974c713c3a3924ae85d8de70cc2e58a1e7124125f29cd3ceae1345678e684.jswww.federalregister.gov/assets/appl... https://www.federalregister.gov/assets/application-823974c713c3a3924ae85d8de70cc2e58a1e7124125f29cd3ceae1345678e684.js — 200 — 355 B — 201 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 — 211 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 — 110 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 — 208 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 — 209 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 — 107 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 — 202 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 — 204 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 — 200 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 — 205 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 — 202 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 — 204 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 — 109 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 — 196 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 — 200 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 — 116.4 KiB — 175 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 — 44 ms — 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https://region1.google-analytics.com/g/collect?v=2&tid=G-EDYG1V6520&gtm=45je64k0h2v899465703za20gzd9131934939&_p=1776800947738&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=BAAI&are=1&cid=1582760022.1776800948&frm=0&pscdl=noapi&rcb=11&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401&sid=1776800948&sct=1&seg=0&dl=https%3A%2F%2Fwww.federalregister.gov%2F&dt=Federal%20Register%20%3A%3A%20Home%20-%20Tuesday%2C%20April%2021st&en=page_view&_fv=1&_ss=1&tfd=1176 — 204 — 48 B — 34 ms — h2https://www.federalregister.gov/assets/fr2_favicon-4140f7a04934cf48501e3b03d299dae7e94a3b86834aa7cc2bddb83d9179443e.svgwww.federalregister.gov/assets/fr2_... https://www.federalregister.gov/assets/fr2_favicon-4140f7a04934cf48501e3b03d299dae7e94a3b86834aa7cc2bddb83d9179443e.svg — 200 — 820 B — 101 ms — h2https://www.federalregister.gov/assets/fr2_favicon-e64975e0e7df2bd990d1adf414332311038b22e3129a03d556ecffd9428d6783.pngwww.federalregister.gov/assets/fr2_... https://www.federalregister.gov/assets/fr2_favicon-e64975e0e7df2bd990d1adf414332311038b22e3129a03d556ecffd9428d6783.png — 200 — 3.8 KiB — 101 ms — h2
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 1558ms · 586KB · $21/mo
Unattributable
Other
Costly
Execution 372ms
Transfer 0 KB
Monthly Cost $5/mo
www.federalregister.gov
Other
Costly
Execution 274ms
Transfer 28 KB
Unused 86%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 246ms
Transfer 160 KB
Unused 40%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 232ms
Transfer 148 KB
Unused 39%
Monthly Cost $3/mo
www.federalregister.gov
Other
Optional
Execution 171ms
Transfer 117 KB
Unused 72%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 98ms
Transfer 116 KB
Unused 54%
Monthly Cost $1/mo
dap.digitalgov.gov
Other
Optional
Execution 87ms
Transfer 4 KB
Monthly Cost $1/mo
www.federalregister.gov
Other
Optional
Execution 78ms
Transfer 13 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 372ms and costs ~$5/month
  • www.federalregister.gov adds 274ms and costs ~$4/month
  • Google Tag Manager adds 246ms and costs ~$3/month
  • Google Tag Manager adds 232ms 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

Unattributable takes 372ms 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.federalregister.gov takes 274ms 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

86% 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

Google Tag Manager 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

Google Tag Manager takes 232ms 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

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

54% 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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