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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
47
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.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

3.55 s

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

6.69 s

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

835 ms

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

0.001

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

4.73 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.

12.14 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
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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2813ms total JS execution
FIX
2813ms total JS execution
Warning::
Unattributable: 505ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-MP1Z...: 410ms CPU time
Warning::
https://script.crazyegg.com/pages/versioned/common...: 403ms CPU time
Warning::
https://www.nih.gov/: 365ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 300ms CPU time
Warning::
Third-party scripts: 2813ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Other 22% Style & Layout 11% Script Parsing & Compilation 11% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable505ms11ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MP1ZEJXS9F&cx=c&gtm=4e64f1h2410ms340ms66ms3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js403ms305ms23ms3rd
https://www.nih.gov/365ms9ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L300ms243ms55ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5CBCNW2254ms197ms54ms3rd
https://www.nih.gov/sites/default/files/js/js_IkN42OOTk7DC0mohqXSgF8BQJgK5VfFJkR6y7o-mnQ8.js?scope=footer&delta=0&language=en&theme=nih2_uswds&include=eJxdjYEOwiAMRH8IRuIPLQ3UWkUgpczp14uKZjNprr13ydULPO5I5Pw4DK4aOV1ckFYgTsOaI-vCobqxf54Tq6GcKeKsQI66_PsJzrDu4dUkPh3mVm-vzsjFepCwhYIV1RYg3FNtkqzmPmUbVA6YYOmY-pd9omghoug3_PC3PgGlVmKC223ms131ms46ms3rd
https://www.nih.gov/themes/custom/nih2_uswds/css/styles.css?taz0vp93ms0ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64f1h281ms27ms53ms3rd
https://www.google-analytics.com/analytics.js68ms54ms8ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
19 scripts, 363 KB unused
FIX
19 scripts, 363 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.googletagmanager.com/gtag/js?id=G-CSLL...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5CB...: 61 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-MP1Z...: 61 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nih.gov/sites/default/files/js/js_IkN4...: 45 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 363 KB
363 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64f1h2147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5CBCNW2129 KB61 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-MP1ZEJXS9F&cx=c&gtm=4e64f1h2156 KB61 KB (39%)✓3rd
https://www.nih.gov/sites/default/files/js/js_IkN42OOTk7DC0mohqXSgF8BQJgK5VfFJkR6y7o-mnQ8.js?scope=footer&delta=0&language=en&theme=nih2_uswds&include=eJxdjYEOwiAMRH8IRuIPLQ3UWkUgpczp14uKZjNprr13ydULPO5I5Pw4DK4aOV1ckFYgTsOaI-vCobqxf54Tq6GcKeKsQI66_PsJzrDu4dUkPh3mVm-vzsjFepCwhYIV1RYg3FNtkqzmPmUbVA6YYOmY-pd9omghoug3_PC3PgGlVmKC70 KB45 KB (64%)✓3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js55 KB28 KB (51%)✓3rd
https://www.google-analytics.com/analytics.js21 KB—✓3rd
https://script.crazyegg.com/pages/scripts/0011/2616.js3 KB—✓3rd
https://www.nih.gov/sites/default/files/js/js_I8yN2jcadLwQ2UnJhfoYhgH0rMoIYFCge7ov_eWFMGQ.js?scope=header&delta=0&language=en&theme=nih2_uswds&include=eJxdjYEOwiAMRH8IRuIPLQ3UWkUgpczp14uKZjNprr13ydULPO5I5Pw4DK4aOV1ckFYgTsOaI-vCobqxf54Tq6GcKeKsQI66_PsJzrDu4dUkPh3mVm-vzsjFepCwhYIV1RYg3FNtkqzmPmUbVA6YYOmY-pd9omghoug3_PC3PgGlVmKC1 KB—✓3rd
https://search.usa.gov/javascripts/remote.loader.js0 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
88 resources · 1.7 MB · 363 KB savings available
FIX
88 resources · 1.7 MB · 363 KB savings available
Warning::
Page weight 670 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~363 KB of savings available
Warning::
87 third-party resources (100% of weight)
88 resources · 1.7 MiB · 87 third-party 669.9 KiB over 1MB target
JavaScript 45% · 763.4 KiB
Image 42% · 706.0 KiB
CSS 7% · 124.2 KiB
Font 5% · 82.6 KiB
Document 1% · 13.4 KiB
Other 0% · 4.4 KiB

~363.4 KiB of savings available

Remove unused JavaScript: 363.4 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
Page Weight Budget
Action
1.7 MB transferred, 88 requests
REVIEW
1.7 MB transferred, 88 requests
Info::
Page weighs 3.9 MB (1.7 MB transferred)
Warning::
JavaScript is 763 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 763 KB
Info::
88 HTTP requests
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
88 requests
0.35 g CO2 per page load
JavaScript 763.4 KiB 45%
Images 630.0 KiB 37%
CSS 124.2 KiB 7%
Fonts 82.6 KiB 5%
Other 76.2 KiB 4%
HTML 13.4 KiB 1%
Other 4.1 KiB 0%
Other 80 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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
Image Optimization
Action
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://www.nih.gov/themes/custom/nih2_uswds/asset... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nih.gov/themes/custom/nih2_uswds/asset... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nih.gov/themes/custom/nih2_uswds/asset... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nih.gov/themes/custom/nih2_uswds/asset... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nih.gov/themes/custom/nih2_uswds/asset... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nih.gov/themes/custom/nih2_uswds/asset... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nih.gov/themes/custom/nih2_uswds/asset... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nih.gov/themes/custom/nih2_uswds/asset... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nih.gov/themes/custom/nih2_uswds/asset... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 630 KB
0 oversized -0 KB
21 legacy format
9 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

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
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 (83 KB)
PASS
4 fonts (83 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

83 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 FCP 3.6 s LCP 6.7 shttps://www.nih.gov/themes/custom/nih2_uswds/assets/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://www.nih.gov/themes/custom/nih2_uswds/assets/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 20.4 KiB — 195 ms — font-display: swaphttps://www.nih.gov/themes/custom/nih2_uswds/assets/fonts/merriweather/Latin-Merriweather-Regular.woff2Latin-Merriweather-Regu... https://www.nih.gov/themes/custom/nih2_uswds/assets/fonts/merriweather/Latin-Merriweather-Regular.woff2 — 21.5 KiB — 195 ms — font-display: swaphttps://www.nih.gov/themes/custom/nih2_uswds/assets/fonts/source-sans-pro/sourcesanspro-semibold-webfont.woff2sourcesanspro-semibold-... https://www.nih.gov/themes/custom/nih2_uswds/assets/fonts/source-sans-pro/sourcesanspro-semibold-webfont.woff2 — 20.4 KiB — 208 ms — font-display: swaphttps://www.nih.gov/themes/custom/nih2_uswds/assets/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://www.nih.gov/themes/custom/nih2_uswds/assets/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 20.2 KiB — 210 ms — font-display: swap
sourcesanspro-regular-w... woff2 swap
Size 20 KB
Load time 195 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
Latin-Merriweather-Regu... woff2 swap
Size 22 KB
Load time 195 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
sourcesanspro-semibold-... woff2 swap
Size 20 KB
Load time 208 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 20 KB
Load time 210 ms
Start 1.9 s
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
88 requests over 3476ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 3.6 s LCP 6.7 shttps://nih.gov// https://nih.gov/ — 301 — 169 B — 626 ms — http/1.0https://www.nih.gov/www.nih.gov/ https://www.nih.gov/ — 200 — 13.4 KiB — 631 ms — h2https://www.nih.gov/themes/contrib/stable/css/core/components/progress.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/core/components/progress.module.css?taz0vp — 200 — 716 B — 139 ms — h2https://www.nih.gov/themes/contrib/stable/css/core/components/ajax-progress.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/core/components/ajax-progress.module.css?taz0vp — 200 — 845 B — 141 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/align.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/align.module.css?taz0vp — 200 — 579 B — 142 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/fieldgroup.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/fieldgroup.module.css?taz0vp — 200 — 459 B — 144 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/container-inline.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/container-inline.module.css?taz0vp — 200 — 518 B — 148 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/clearfix.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/clearfix.module.css?taz0vp — 200 — 585 B — 146 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/details.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/details.module.css?taz0vp — 200 — 472 B — 144 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/hidden.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/hidden.module.css?taz0vp — 200 — 1013 B — 149 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/item-list.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/item-list.module.css?taz0vp — 200 — 518 B — 150 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/js.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/js.module.css?taz0vp — 200 — 596 B — 151 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/nowrap.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/nowrap.module.css?taz0vp — 200 — 468 B — 260 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/position-container.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/position-container.module.css?taz0vp — 200 — 457 B — 258 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/reset-appearance.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/reset-appearance.module.css?taz0vp — 200 — 553 B — 266 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/resize.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/resize.module.css?taz0vp — 200 — 519 B — 261 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/system-status-counter.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/system-status-counter.css?taz0vp — 200 — 671 B — 266 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/system-status-report-counters.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/system-status-report-counters.css?taz0vp — 200 — 669 B — 263 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/system-status-report-general-info.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/system-status-report-general-info.css?taz0vp — 200 — 537 B — 260 ms — h2https://www.nih.gov/themes/contrib/stable/css/system/components/tablesort.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/system/components/tablesort.module.css?taz0vp — 200 — 576 B — 266 ms — h2https://www.nih.gov/themes/contrib/stable/css/views/views.module.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/views/views.module.css?taz0vp — 200 — 580 B — 261 ms — h2https://www.nih.gov/modules/contrib/extlink/css/extlink.css?taz0vpwww.nih.gov/modules/contrib/extlink... https://www.nih.gov/modules/contrib/extlink/css/extlink.css?taz0vp — 200 — 838 B — 267 ms — h2https://www.nih.gov/modules/contrib/paragraphs/css/paragraphs.unpublished.css?taz0vpwww.nih.gov/modules/contrib/paragra... https://www.nih.gov/modules/contrib/paragraphs/css/paragraphs.unpublished.css?taz0vp — 200 — 385 B — 268 ms — h2https://www.nih.gov/themes/contrib/stable/css/core/assets/vendor/normalize-css/normalize.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/core/assets/vendor/normalize-css/normalize.css?taz0vp — 200 — 2.9 KiB — 274 ms — 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https://www.google-analytics.com/j/collect?v=1&_v=j102&a=464448754&t=pageview&_s=1&dl=https%3A%2F%2Fwww.nih.gov%2F&ul=en-us&dt=National%20Institutes%20of%20Health%20(NIH)%20%7C&sr=412x823&vp=412x823&_u=YEBAAEABAAAAACAAI~&jid=973114302&gjid=1505550192&cid=550881713.1776359126&tid=UA-22075261-1&_gid=1331303229.1776359126&_r=1&_slc=1&gtm=45He64f1h2n815CBCNW2v867164358za200zd867164358&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616986~115938466~115938468~117266400~118131809&z=951972517 — 200 — 450 B — 57 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-MP1ZEJXS9F&gtm=45je64f1h2v873339392z8867164358za20gzb867164358zd867164358&_p=1776359125284&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=Ag&are=1&cid=550881713.1776359126&frm=0&pscdl=noapi&rcb=5&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266401~118463262&sid=1776359126&sct=1&seg=0&dl=https%3A%2F%2Fwww.nih.gov%2F&dt=National%20Institutes%20of%20Health%20(NIH)%20%7C&en=page_view&_fv=1&_ss=1&tfd=2587www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-MP1ZEJXS9F&gtm=45je64f1h2v873339392z8867164358za20gzb867164358zd867164358&_p=1776359125284&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=Ag&are=1&cid=550881713.1776359126&frm=0&pscdl=noapi&rcb=5&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266401~118463262&sid=1776359126&sct=1&seg=0&dl=https%3A%2F%2Fwww.nih.gov%2F&dt=National%20Institutes%20of%20Health%20(NIH)%20%7C&en=page_view&_fv=1&_ss=1&tfd=2587 — 204 — 20 B — 96 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-MP1ZEJXS9F&gtm=45je64f1h2v873339392z8867164358za20gzb867164358zd867164358&_p=1776359125284&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAAQ&are=1&cid=550881713.1776359126&frm=0&pscdl=noapi&rcb=5&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=2&tag_exp=0~115616986~115938466~115938468~117266401~117971173~118463262&sid=1776359126&sct=1&seg=0&dl=https%3A%2F%2Fwww.nih.gov%2F&dt=National%20Institutes%20of%20Health%20(NIH)%20%7C&en=%5Bobject%20Object%5D&_et=6&tfd=2597www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-MP1ZEJXS9F&gtm=45je64f1h2v873339392z8867164358za20gzb867164358zd867164358&_p=1776359125284&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAAQ&are=1&cid=550881713.1776359126&frm=0&pscdl=noapi&rcb=5&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=2&tag_exp=0~115616986~115938466~115938468~117266401~117971173~118463262&sid=1776359126&sct=1&seg=0&dl=https%3A%2F%2Fwww.nih.gov%2F&dt=National%20Institutes%20of%20Health%20(NIH)%20%7C&en=%5Bobject%20Object%5D&_et=6&tfd=2597 — 204 — 20 B — 86 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-MP1ZEJXS9F&gtm=45je64f1h2v873339392za20gzb867164358zd867164358&_p=1776359125284&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAgAAAQ&are=1&cid=550881713.1776359126&frm=0&pscdl=noapi&rcb=5&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=3&tag_exp=0~115616986~115938466~115938468~117266401~118463262&cu=USD&sid=1776359126&sct=1&seg=0&dl=https%3A%2F%2Fwww.nih.gov%2F&dt=National%20Institutes%20of%20Health%20(NIH)%20%7C&en=click_on_jobs___nih_link&_c=1&epn.value=0&_et=1&tfd=2599www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-MP1ZEJXS9F&gtm=45je64f1h2v873339392za20gzb867164358zd867164358&_p=1776359125284&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAgAAAQ&are=1&cid=550881713.1776359126&frm=0&pscdl=noapi&rcb=5&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=3&tag_exp=0~115616986~115938466~115938468~117266401~118463262&cu=USD&sid=1776359126&sct=1&seg=0&dl=https%3A%2F%2Fwww.nih.gov%2F&dt=National%20Institutes%20of%20Health%20(NIH)%20%7C&en=click_on_jobs___nih_link&_c=1&epn.value=0&_et=1&tfd=2599 — 204 — 20 B — 85 ms — 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https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64f0v9131934939za200zb867164358zd867164358&_p=1776359125284&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&are=1&cid=550881713.1776359126&frm=0&pscdl=noapi&rcb=4&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&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&dl=https%3A%2F%2Fnih.gov%2F&dt=National%20Institutes%20of%20Health%20(NIH)%20%7C&dr=&sid=1776359126&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=HHS&ep.subagency=NIH&ep.site_topic=unspecified%3Anih.gov&ep.site_platform=unspecified%3Anih.gov&ep.script_source=https%3A%2F%2Fdap.digitalgov.gov%2Funiversal-federated-analytics-min.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=nih.gov&tfd=2672 — 204 — 20 B — 68 ms — h3https://www.nih.gov/themes/custom/nih2_uswds/assets/img/favicons/custom/favicon-192x192.pngwww.nih.gov/themes/custom/nih2_uswd... https://www.nih.gov/themes/custom/nih2_uswds/assets/img/favicons/custom/favicon-192x192.png — 200 — 4.4 KiB — 126 ms — h2https://log.pinterest.com/?type=pidget&guid=pp842vTQmCTm&tv=2021110201&event=init&sub=www&button_count=0&follow_count=0&pin_count=0&profile_count=0&board_count=0&section_count=0&lang=en&nvl=en-US&via=https%3A%2F%2Fwww.nih.gov%2F&viaSrc=canonicallog.pinterest.com/?type=pidget&guid... https://log.pinterest.com/?type=pidget&guid=pp842vTQmCTm&tv=2021110201&event=init&sub=www&button_count=0&follow_count=0&pin_count=0&profile_count=0&board_count=0&section_count=0&lang=en&nvl=en-US&via=https%3A%2F%2Fwww.nih.gov%2F&viaSrc=canonical — 200 — 394 B — 145 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 2813ms · 863KB · $37/mo
Unattributable
Other
Costly
Execution 505ms
Transfer 0 KB
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 410ms
Transfer 156 KB
Unused 39%
Monthly Cost $5/mo
script.crazyegg.com
Other
Costly
Execution 403ms
Transfer 55 KB
Unused 51%
Monthly Cost $5/mo
www.nih.gov
Other
Costly
Execution 365ms
Transfer 13 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 300ms
Transfer 147 KB
Unused 42%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 254ms
Transfer 129 KB
Unused 48%
Monthly Cost $3/mo
www.nih.gov
Other
Costly
Execution 223ms
Transfer 70 KB
Unused 64%
Monthly Cost $3/mo
www.nih.gov
Other
Optional
Execution 93ms
Transfer 102 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 81ms
Transfer 147 KB
Unused 72%
Monthly Cost $1/mo
Google Analytics
Analytics
Optional
Execution 68ms
Transfer 21 KB
Monthly Cost $1/mo
dap.digitalgov.gov
Other
Optional
Execution 56ms
Transfer 4 KB
Monthly Cost $1/mo
assets.pinterest.com
Other
Optional
Execution 54ms
Transfer 18 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 505ms and costs ~$7/month
  • Google Tag Manager adds 410ms and costs ~$5/month
  • script.crazyegg.com adds 403ms and costs ~$5/month
  • www.nih.gov adds 365ms and costs ~$5/month
  • Google Tag Manager adds 300ms and costs ~$4/month
  • Google Tag Manager adds 254ms and costs ~$3/month
  • www.nih.gov adds 223ms 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 505ms 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 410ms 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

script.crazyegg.com 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

51% of script.crazyegg.com'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

www.nih.gov takes 365ms 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 300ms 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 254ms 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.nih.gov takes 223ms 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

64% of www.nih.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

72% 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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