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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
75
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.

1.76 s

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

2.57 s

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

50 ms

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

0.051

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

2.31 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.

3.12 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
5 PASS 4 REVIEW 4 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 (1.3 MiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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=4e64f0147 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=4e64f0156 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://ucm-us.verint-cdn.com/files/sites/nih-gov/live/sdk.js1 KB—✓3rd
https://assets.pinterest.com/js/pinit.js0 KB—✓3rd
https://script.crazyegg.com/pages/scripts/0011/2616.js3 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 · 1.3 MB · 363 KB savings available
FIX
88 resources · 1.3 MB · 363 KB savings available
Warning::
Page weight 341 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~363 KB of savings available
Warning::
87 third-party resources (100% of weight)
88 resources · 1.3 MiB · 87 third-party 341.2 KiB over 1MB target
JavaScript 56% · 763.4 KiB
Image 28% · 377.3 KiB
CSS 9% · 124.2 KiB
Font 6% · 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.

B
Page Weight Budget
1.3 MB transferred, 88 requests
REVIEW
1.3 MB transferred, 88 requests
Info::
Page weighs 3.6 MB (1.3 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 0.28 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
88 requests
0.28 g CO2 per page load
JavaScript 763.4 KiB 56%
Images 301.3 KiB 22%
CSS 124.2 KiB 9%
Fonts 82.6 KiB 6%
Other 76.2 KiB 6%
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
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
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 301 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

B
JS Execution Cost
671ms total JS execution
REVIEW
671ms total JS execution
Info::
https://script.crazyegg.com/pages/versioned/common...: 141ms CPU time
Info::
Unattributable: 138ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-MP1Z...: 103ms CPU time
Info::
https://www.nih.gov/: 98ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 78ms CPU time
Warning::
Third-party scripts: 671ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Other 23% Style & Layout 12% Script Parsing & Compilation 9% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js141ms108ms6ms3rd
Unattributable138ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MP1ZEJXS9F&cx=c&gtm=4e64f0103ms87ms15ms3rd
https://www.nih.gov/98ms2ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L78ms64ms14ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5CBCNW261ms48ms12ms3rd
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_PC3PgGlVmKC53ms28ms7ms3rd
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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.8 s LCP 2.6 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 — 197 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 — 198 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 — 198 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 — 198 ms — font-display: swap
sourcesanspro-regular-w... woff2 swap
Size 20 KB
Load time 197 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
sourcesanspro-semibold-... woff2 swap
Size 20 KB
Load time 198 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
Latin-Merriweather-Regu... woff2 swap
Size 22 KB
Load time 198 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 20 KB
Load time 198 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
Network Waterfall
88 requests over 3388ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.8 s LCP 2.6 shttps://nih.gov// https://nih.gov/ — 301 — 169 B — 631 ms — http/1.0https://www.nih.gov/www.nih.gov/ https://www.nih.gov/ — 200 — 13.4 KiB — 629 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 — 140 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 — 580 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 — 143 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 — 144 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 — 145 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 — 146 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 — 147 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 — 148 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 — 149 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 — 258 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 — 260 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 — 260 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 — 262 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 — 263 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 — 264 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 — 388 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 — 264 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 — 276 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 — 277 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 — 381 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 — 273 ms — h2https://www.nih.gov/themes/contrib/stable/css/core/normalize-fixes.css?taz0vpwww.nih.gov/themes/contrib/stable/c... https://www.nih.gov/themes/contrib/stable/css/core/normalize-fixes.css?taz0vp — 200 — 564 B — 281 ms — h2https://www.nih.gov/themes/contrib/classy/css/components/messages.css?taz0vpwww.nih.gov/themes/contrib/classy/c... https://www.nih.gov/themes/contrib/classy/css/components/messages.css?taz0vp — 200 — 976 B — 264 ms — h2https://www.nih.gov/themes/contrib/classy/css/components/progress.css?taz0vpwww.nih.gov/themes/contrib/classy/c... https://www.nih.gov/themes/contrib/classy/css/components/progress.css?taz0vp — 200 — 1.0 KiB — 277 ms — h2https://www.nih.gov/themes/custom/nih2_uswds/css/custom.css?taz0vpwww.nih.gov/themes/custom/nih2_uswd... https://www.nih.gov/themes/custom/nih2_uswds/css/custom.css?taz0vp — 200 — 565 B — 264 ms — h2https://www.nih.gov/themes/contrib/uswds/css/style.css?taz0vpwww.nih.gov/themes/contrib/uswds/cs... 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h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=2089814897&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=800x600&vp=1350x940&_u=YEBAAEABAAAAACAAI~&jid=823099634&gjid=1672187884&cid=525643466.1776359146&tid=UA-22075261-1&_gid=1540950025.1776359146&_r=1&_slc=1&gtm=45He64f0n815CBCNW2v867164358za200zd867164358&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938466~115938469~117266400~117884344~118128922&z=486488025www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=2089814897&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=800x600&vp=1350x940&_u=YEBAAEABAAAAACAAI~&jid=823099634&gjid=1672187884&cid=525643466.1776359146&tid=UA-22075261-1&_gid=1540950025.1776359146&_r=1&_slc=1&gtm=45He64f0n815CBCNW2v867164358za200zd867164358&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938466~115938469~117266400~117884344~118128922&z=486488025 — 200 — 450 B — 57 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-MP1ZEJXS9F&gtm=45je64f0v873339392z8867164358za20gzb867164358zd867164358&_p=1776359145385&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=Ag&are=1&cid=525643466.1776359146&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400~117512542&sid=1776359146&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=2479www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-MP1ZEJXS9F&gtm=45je64f0v873339392z8867164358za20gzb867164358zd867164358&_p=1776359145385&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=Ag&are=1&cid=525643466.1776359146&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400~117512542&sid=1776359146&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=2479 — 204 — 20 B — 99 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-MP1ZEJXS9F&gtm=45je64f0v873339392z8867164358za20gzb867164358zd867164358&_p=1776359145385&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAAQ&are=1&cid=525643466.1776359146&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=2&tag_exp=0~115938466~115938468~117266400~117512542~117971173&sid=1776359146&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=7&tfd=2490www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-MP1ZEJXS9F&gtm=45je64f0v873339392z8867164358za20gzb867164358zd867164358&_p=1776359145385&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAAQ&are=1&cid=525643466.1776359146&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=2&tag_exp=0~115938466~115938468~117266400~117512542~117971173&sid=1776359146&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=7&tfd=2490 — 204 — 20 B — 90 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-MP1ZEJXS9F&gtm=45je64f0v873339392za20gzb867164358zd867164358&_p=1776359145385&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAgAAAQ&are=1&cid=525643466.1776359146&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=3&tag_exp=0~115938466~115938468~117266400~117512542&cu=USD&sid=1776359146&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=2491www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-MP1ZEJXS9F&gtm=45je64f0v873339392za20gzb867164358zd867164358&_p=1776359145385&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAgAAAQ&are=1&cid=525643466.1776359146&frm=0&pscdl=noapi&rcb=0&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=3&tag_exp=0~115938466~115938468~117266400~117512542&cu=USD&sid=1776359146&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=2491 — 204 — 20 B — 89 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64f0v9131934939za200zb867164358zd867164358&_p=1776359145385&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&are=1&cid=525643466.1776359146&frm=0&pscdl=noapi&rcb=2&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~117512542~118128922&dl=https%3A%2F%2Fnih.gov%2F&dt=National%20Institutes%20of%20Health%20(NIH)%20%7C&dr=&sid=1776359146&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=2568www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64f0v9131934939za200zb867164358zd867164358&_p=1776359145385&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&are=1&cid=525643466.1776359146&frm=0&pscdl=noapi&rcb=2&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~117512542~118128922&dl=https%3A%2F%2Fnih.gov%2F&dt=National%20Institutes%20of%20Health%20(NIH)%20%7C&dr=&sid=1776359146&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=2568 — 204 — 20 B — 56 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=by0eUDJ7oKDy&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=by0eUDJ7oKDy&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 — 393 B — 139 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 671ms · 570KB · $9/mo
script.crazyegg.com
Other
Optional
Execution 141ms
Transfer 55 KB
Unused 51%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 138ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 103ms
Transfer 156 KB
Unused 39%
Monthly Cost $1/mo
www.nih.gov
Other
Optional
Execution 98ms
Transfer 13 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 78ms
Transfer 147 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 129 KB
Unused 48%
Monthly Cost $1/mo
www.nih.gov
Other
Optional
Execution 53ms
Transfer 70 KB
Unused 64%
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

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

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

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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