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https://ahrq.gov

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
32
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
88
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

4.44 s

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

17.12 s

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

322 ms

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

0.660

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

5.64 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.

17.64 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
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.9 MB transferred, 65 requests
FIX
3.9 MB transferred, 65 requests
Warning::
Page weighs 5.8 MB (3.9 MB transferred)
Warning::
Images are 3.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.0 MB
Warning::
JavaScript is 719 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 719 KB
Info::
65 HTTP requests
Info::
Estimated 0.82 g CO2 per page load
3.9 MB / 2.4 MB budget
3.9 MB transferred
65 requests
0.82 g CO2 per page load
Images 3.0 MiB 76%
JavaScript 718.9 KiB 18%
Fonts 113.9 KiB 3%
CSS 99.8 KiB 3%
HTML 18.8 KiB 0%
Other 2.9 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

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 (3.9 MiB of 3.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
13 scripts, 353 KB unused
FIX
13 scripts, 353 KB unused
Warning::
https://d3js.org/d3.v6.min.js: 72 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=GTM-W4...: 70 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-1NPT...: 67 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://unpkg.com/leaflet@1.7.1/dist/leaflet.js: 33 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 353 KB
353 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://d3js.org/d3.v6.min.js88 KB72 KB (82%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GTM-W4NX5V136 KB70 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-1NPT56LE7J&cx=c&gtm=4e64k0158 KB67 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB60 KB (41%)✓3rd
https://unpkg.com/leaflet@1.7.1/dist/leaflet.js40 KB33 KB (84%)✓3rd
https://www.ahrq.gov/sites/default/files/js/js_zqN5L6hLqGAH3OYy6FzD1htIlHo5-HawzTzOr-tMUUk.js?scope=footer&delta=5&language=en&theme=ahrq_bootstrap_barrio&include=eJyFzGEKwjAMBeALTXOk8LLWrRibmkZwtxepDAXFP-HleyFIKQx1I7zC8eRWY8LqV3oOnuF261m_EK_tTZt45QsGsZhFD0djgXsx2uFHv6gJ9NBj01KXcZTyvdCehmVtojafO32u05-PD4EhXOQ62 KB30 KB (48%)✓3rd
https://static.addtoany.com/menu/modules/core.ydpp7jcu.js26 KB21 KB (82%)✓3rd
https://www.ahrq.gov/sites/default/files/js/js_unihZr_Dvz3YEEPz4AIrbFHZjGqxzmalkUUV4qZpfe0.js?scope=footer&delta=2&language=en&theme=ahrq_bootstrap_barrio&include=eJyFzGEKwjAMBeALTXOk8LLWrRibmkZwtxepDAXFP-HleyFIKQx1I7zC8eRWY8LqV3oOnuF261m_EK_tTZt45QsGsZhFD0djgXsx2uFHv6gJ9NBj01KXcZTyvdCehmVtojafO32u05-PD4EhXOQ12 KB—✓3rd
https://www.ahrq.gov/sites/default/files/js/js_pI45Gx24j6O2NQ112bQDlF2BHdz30vbtWV8PmdH9-t4.js?scope=footer&delta=0&language=en&theme=ahrq_bootstrap_barrio&include=eJyFzGEKwjAMBeALTXOk8LLWrRibmkZwtxepDAXFP-HleyFIKQx1I7zC8eRWY8LqV3oOnuF261m_EK_tTZt45QsGsZhFD0djgXsx2uFHv6gJ9NBj01KXcZTyvdCehmVtojafO32u05-PD4EhXOQ33 KB—✓3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=HHS&subagency=AHRQ9 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 · 3.9 MB · 353 KB savings available
FIX
65 resources · 3.9 MB · 353 KB savings available
Warning::
Page weight 2.9 MB over 1MB target
Got: 3.9 MB Expected: ≤ 1 MB
Info::
~353 KB of savings available
Warning::
64 third-party resources (100% of weight)
Info::
4 resources over 200KB
65 resources · 3.9 MiB · 64 third-party 2.9 MiB over 1MB target
Image 76% · 3.0 MiB
JavaScript 18% · 718.9 KiB
Font 3% · 113.9 KiB
CSS 3% · 99.8 KiB
Document 0% · 18.9 KiB
Other 0% · 596 B

~352.6 KiB of savings available

Remove unused JavaScript: 352.6 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
37 images, 0 KB saveable
REVIEW
37 images, 0 KB saveable
Warning::
https://www.ahrq.gov/themes/custom/ahrq_bootstrap_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ahrq.gov/themes/custom/ahrq_bootstrap_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ahrq.gov/themes/custom/ahrq_bootstrap_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ahrq.gov/themes/custom/ahrq_bootstrap_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ahrq.gov/themes/custom/ahrq_bootstrap_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ahrq.gov/themes/custom/ahrq_bootstrap_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ahrq.gov/themes/custom/ahrq_bootstrap_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
37 images 3.0 MB
0 oversized -0 KB
37 legacy format
7 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

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
1805ms total JS execution
REVIEW
1805ms total JS execution
Warning::
Unattributable: 415ms CPU time
Warning::
https://www.ahrq.gov/: 403ms CPU time
Info::
https://www.ahrq.gov/sites/default/files/js/js_pI4...: 247ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 215ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-1NPT...: 204ms CPU time
Warning::
Third-party scripts: 1805ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 23% Style & Layout 18% Script Parsing & Compilation 9% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable415ms11ms0ms3rd
https://www.ahrq.gov/403ms11ms3ms3rd
https://www.ahrq.gov/sites/default/files/js/js_pI45Gx24j6O2NQ112bQDlF2BHdz30vbtWV8PmdH9-t4.js?scope=footer&delta=0&language=en&theme=ahrq_bootstrap_barrio&include=eJyFzGEKwjAMBeALTXOk8LLWrRibmkZwtxepDAXFP-HleyFIKQx1I7zC8eRWY8LqV3oOnuF261m_EK_tTZt45QsGsZhFD0djgXsx2uFHv6gJ9NBj01KXcZTyvdCehmVtojafO32u05-PD4EhXOQ247ms176ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L215ms177ms35ms3rd
https://www.googletagmanager.com/gtag/js?id=G-1NPT56LE7J&cx=c&gtm=4e64k0204ms166ms37ms3rd
https://www.googletagmanager.com/gtag/js?id=GTM-W4NX5V130ms100ms29ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js87ms84ms1ms3rd
https://www.ahrq.gov/sites/default/files/css/css_-Lf44xSgnh2X5EsstgY0S55arm6IdNeWFFDnuEsKpak.css?delta=3&language=en&theme=ahrq_bootstrap_barrio&include=eJyFjl0OAiEMhC-E2yORVtiVCBTb-sPtjeyGxAfjy2Tma5MZDMEYawc8zLIKV3N4kRt8xDeS6gu2gTwxm5pg84QiiWGCH_ctM2E-qfWc6rY_hfhKMN3OYm6U-XxV-I5ujoCxZGUp7l-LdrVYgFCje6T4VBi6FA73HN9ah2Cw52ms0ms0ms3rd
https://unpkg.com/leaflet@1.7.1/dist/leaflet.js51ms29ms22ms3rd
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+
Font Loading
4 fonts (114 KB)
PASS
4 fonts (114 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

114 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 12.0 s 14.0 s 16.0 s FCP 4.4 s LCP 17.1 shttps://www.ahrq.gov/themes/custom/ahrq_bootstrap_barrio/pattern-lab/public/uswds/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://www.ahrq.gov/themes/custom/ahrq_bootstrap_barrio/pattern-lab/public/uswds/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 20.9 KiB — 20 ms — font-display: swaphttps://www.ahrq.gov/themes/custom/ahrq_bootstrap_barrio/pattern-lab/public/uswds/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://www.ahrq.gov/themes/custom/ahrq_bootstrap_barrio/pattern-lab/public/uswds/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 20.7 KiB — 16 ms — font-display: swaphttps://www.ahrq.gov/themes/custom/ahrq_bootstrap_barrio/pattern-lab/public/uswds/fonts/public-sans/PublicSans-SemiBold.woff2PublicSans-SemiBold.woff2 https://www.ahrq.gov/themes/custom/ahrq_bootstrap_barrio/pattern-lab/public/uswds/fonts/public-sans/PublicSans-SemiBold.woff2 — 36.2 KiB — 18 ms — font-display: swaphttps://www.ahrq.gov/themes/custom/ahrq_bootstrap_barrio/pattern-lab/public/uswds/fonts/public-sans/PublicSans-Bold.woff2PublicSans-Bold.woff2 https://www.ahrq.gov/themes/custom/ahrq_bootstrap_barrio/pattern-lab/public/uswds/fonts/public-sans/PublicSans-Bold.woff2 — 36.0 KiB — 13 ms — font-display: swap
sourcesanspro-regular-w... woff2 swap
Size 21 KB
Load time 20 ms
Start 565 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 21 KB
Load time 16 ms
Start 565 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-SemiBold.woff2 woff2 swap
Size 36 KB
Load time 18 ms
Start 565 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold.woff2 woff2 swap
Size 36 KB
Load time 13 ms
Start 700 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
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
65 requests over 1541ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 4.4 s LCP 17.1 shttps://ahrq.gov// https://ahrq.gov/ — 302 — 132 B — 306 ms — h2https://www.ahrq.gov/www.ahrq.gov/ https://www.ahrq.gov/ — 200 — 17.8 KiB — 50 ms — h2https://www.ahrq.gov/sites/default/files/css/css_qJHfogkXiiWB8nUjgCU8z8IreMdxc1N_izoO53T7MCA.css?delta=0&language=en&theme=ahrq_bootstrap_barrio&include=eJyFjl0OAiEMhC-E2yORVtiVCBTb-sPtjeyGxAfjy2Tma5MZDMEYawc8zLIKV3N4kRt8xDeS6gu2gTwxm5pg84QiiWGCH_ctM2E-qfWc6rY_hfhKMN3OYm6U-XxV-I5ujoCxZGUp7l-LdrVYgFCje6T4VBi6FA73HN9ah2Cwwww.ahrq.gov/sites/default/files/cs... https://www.ahrq.gov/sites/default/files/css/css_qJHfogkXiiWB8nUjgCU8z8IreMdxc1N_izoO53T7MCA.css?delta=0&language=en&theme=ahrq_bootstrap_barrio&include=eJyFjl0OAiEMhC-E2yORVtiVCBTb-sPtjeyGxAfjy2Tma5MZDMEYawc8zLIKV3N4kRt8xDeS6gu2gTwxm5pg84QiiWGCH_ctM2E-qfWc6rY_hfhKMN3OYm6U-XxV-I5ujoCxZGUp7l-LdrVYgFCje6T4VBi6FA73HN9ah2Cw — 200 — 2.2 KiB — 13 ms — h2https://unpkg.com/leaflet@1.7.1/dist/leaflet.cssunpkg.com/leaflet@1.7.1/dist/leafle... https://unpkg.com/leaflet@1.7.1/dist/leaflet.css — 200 — 3.6 KiB — 90 ms — h3https://www.ahrq.gov/sites/default/files/css/css_F5FDSE50BjKBuP-vfXXXVQyvqjlVuNXvx0sbU-TAIAg.css?delta=2&language=en&theme=ahrq_bootstrap_barrio&include=eJyFjl0OAiEMhC-E2yORVtiVCBTb-sPtjeyGxAfjy2Tma5MZDMEYawc8zLIKV3N4kRt8xDeS6gu2gTwxm5pg84QiiWGCH_ctM2E-qfWc6rY_hfhKMN3OYm6U-XxV-I5ujoCxZGUp7l-LdrVYgFCje6T4VBi6FA73HN9ah2Cwwww.ahrq.gov/sites/default/files/cs... https://www.ahrq.gov/sites/default/files/css/css_F5FDSE50BjKBuP-vfXXXVQyvqjlVuNXvx0sbU-TAIAg.css?delta=2&language=en&theme=ahrq_bootstrap_barrio&include=eJyFjl0OAiEMhC-E2yORVtiVCBTb-sPtjeyGxAfjy2Tma5MZDMEYawc8zLIKV3N4kRt8xDeS6gu2gTwxm5pg84QiiWGCH_ctM2E-qfWc6rY_hfhKMN3OYm6U-XxV-I5ujoCxZGUp7l-LdrVYgFCje6T4VBi6FA73HN9ah2Cw — 200 — 4.7 KiB — 11 ms — h2https://www.ahrq.gov/sites/default/files/css/css_-Lf44xSgnh2X5EsstgY0S55arm6IdNeWFFDnuEsKpak.css?delta=3&language=en&theme=ahrq_bootstrap_barrio&include=eJyFjl0OAiEMhC-E2yORVtiVCBTb-sPtjeyGxAfjy2Tma5MZDMEYawc8zLIKV3N4kRt8xDeS6gu2gTwxm5pg84QiiWGCH_ctM2E-qfWc6rY_hfhKMN3OYm6U-XxV-I5ujoCxZGUp7l-LdrVYgFCje6T4VBi6FA73HN9ah2Cwwww.ahrq.gov/sites/default/files/cs... https://www.ahrq.gov/sites/default/files/css/css_-Lf44xSgnh2X5EsstgY0S55arm6IdNeWFFDnuEsKpak.css?delta=3&language=en&theme=ahrq_bootstrap_barrio&include=eJyFjl0OAiEMhC-E2yORVtiVCBTb-sPtjeyGxAfjy2Tma5MZDMEYawc8zLIKV3N4kRt8xDeS6gu2gTwxm5pg84QiiWGCH_ctM2E-qfWc6rY_hfhKMN3OYm6U-XxV-I5ujoCxZGUp7l-LdrVYgFCje6T4VBi6FA73HN9ah2Cw — 200 — 88.2 KiB — 19 ms — h2https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=HHS&subagency=AHRQdap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=HHS&subagency=AHRQ — 200 — 9.4 KiB — 51 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 1805ms · 625KB · $24/mo
Unattributable
Other
Costly
Execution 415ms
Transfer 0 KB
Monthly Cost $6/mo
www.ahrq.gov
Other
Costly
Execution 403ms
Transfer 18 KB
Monthly Cost $5/mo
www.ahrq.gov
Other
Costly
Execution 247ms
Transfer 33 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 215ms
Transfer 147 KB
Unused 41%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 204ms
Transfer 158 KB
Unused 42%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 130ms
Transfer 136 KB
Unused 51%
Monthly Cost $2/mo
dap.digitalgov.gov
Other
Optional
Execution 87ms
Transfer 4 KB
Monthly Cost $1/mo
www.ahrq.gov
Other
Optional
Execution 52ms
Transfer 88 KB
Monthly Cost $1/mo
unpkg
CDN
Optional
Execution 51ms
Transfer 40 KB
Unused 84%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 415ms and costs ~$6/month
  • www.ahrq.gov adds 403ms and costs ~$5/month
  • www.ahrq.gov adds 247ms and costs ~$3/month
  • Google Tag Manager adds 215ms and costs ~$3/month
  • Google Tag Manager adds 204ms 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 415ms 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.ahrq.gov takes 403ms 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.ahrq.gov takes 247ms 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 215ms 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 204ms 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

51% 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

84% of unpkg'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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