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https://medlineplus.gov

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
43
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.
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.

1.44 s

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

11.75 s

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

2.26 s

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.

4.96 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.

11.76 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 4 REVIEW 4 FIX
D
Third-Party Impact
Action
69% third-party, 0 ms blocking
FIX
69% third-party, 0 ms blocking
Warning::
Third-party code accounts for 69% of page weight (867.7 KiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
31%
69%
First-party Third-party
F
JS Execution Cost
Action
4170ms total JS execution
FIX
4170ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MMV...: 557ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7147...: 542ms CPU time
Warning::
https://medlineplus.gov/jslib/jquery-3.6.0.min.js: 494ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-P1FP...: 480ms CPU time
Warning::
Unattributable: 465ms CPU time
Warning::
Third-party scripts: 3172ms (76% of total)

Main Thread Breakdown

Script Evaluation 61% Script Parsing & Compilation 15% Other 15% Style & Layout 6%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-MMVM77557ms432ms93ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7147EPK006&cx=c&gtm=4e64h1542ms447ms93ms3rd
https://medlineplus.gov/jslib/jquery-3.6.0.min.js494ms317ms122ms1st
https://www.googletagmanager.com/gtag/js?id=G-P1FPTH9PL4&cx=c&gtm=4e64h1480ms400ms78ms3rd
Unattributable465ms11ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L398ms320ms75ms3rd
https://medlineplus.gov/uswds/js/uswds.min.js321ms62ms21ms1st
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js220ms159ms3ms3rd
https://siteintercept.qualtrics.com/dxjsmodule/37.7ea1ffe71ad8c0799cc1.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=medlineplus.gov152ms138ms10ms3rd
https://www.google-analytics.com/analytics.js132ms99ms16ms3rd

Showing top 10 of 14 scripts

D
JS Bundles
Action
23 scripts, 379 KB unused
FIX
23 scripts, 379 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-7147...: 65 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-P1FP...: 63 KB unused (40%)
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-MMV...: 57 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 379 KB
379 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-7147EPK006&cx=c&gtm=4e64h1161 KB65 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-P1FPTH9PL4&cx=c&gtm=4e64h1157 KB63 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MMVM77146 KB57 KB (39%)✓3rd
https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=medlineplus.gov36 KB25 KB (70%)✓3rd
https://medlineplus.gov/uswds/js/uswds.min.js27 KB—✓1st
https://www.nlm.nih.gov/core/nlm-notifyExternal/1.0/nlm-notifyExternal.js1 KB—✓3rd
https://www.nlm.nih.gov/coop_all_uswds.js?_=17767994914771 KB—✓3rd
https://www.nlm.nih.gov/core/nlm-autocomplete/1.1/nlm-autocomplete.js6 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
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.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Page Weight Budget
1.2 MB transferred, 55 requests
REVIEW
1.2 MB transferred, 55 requests
Info::
Page weighs 3.3 MB (1.2 MB transferred)
Warning::
JavaScript is 943 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 943 KB
Info::
55 HTTP requests
Info::
Estimated 0.26 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
55 requests
0.26 g CO2 per page load
JavaScript 942.7 KiB 75%
Images 140.9 KiB 11%
Other 70.5 KiB 6%
Fonts 43.4 KiB 3%
CSS 34.2 KiB 3%
HTML 27.5 KiB 2%
Other 4.5 KiB 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
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://medlineplus.gov/images/feed.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://medlineplus.gov/images/nihlogo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://medlineplus.gov/images/featured/HealthySle... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://medlineplus.gov/uswds/img/us_flag_small.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 141 KB
0 oversized -0 KB
18 legacy format
4 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

C
Page Weight Inventory
Action
55 resources · 1.2 MB · 379 KB savings available
REVIEW
55 resources · 1.2 MB · 379 KB savings available
Warning::
Page weight 240 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~379 KB of savings available
Warning::
22 third-party resources (69% of weight)
55 resources · 1.2 MiB · 22 third-party 239.7 KiB over 1MB target
JavaScript 80% · 1010.9 KiB
Image 11% · 143.7 KiB
Font 3% · 43.4 KiB
CSS 3% · 34.2 KiB
Document 2% · 27.5 KiB
Other 0% · 4.0 KiB

~379.1 KiB of savings available

Remove unused JavaScript: 379.1 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+
Font Loading
2 fonts (43 KB)
PASS
2 fonts (43 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

43 KB total

Render-blocking

0

of 2

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 FCP 1.4 s LCP 11.7 shttps://medlineplus.gov/uswds/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://medlineplus.gov/uswds/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 21.8 KiB — 8 ms — font-display: swaphttps://medlineplus.gov/uswds/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://medlineplus.gov/uswds/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 21.6 KiB — 10 ms — font-display: swap
sourcesanspro-regular-w... woff2 swap
Size 22 KB
Load time 8 ms
Start 682 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 22 KB
Load time 10 ms
Start 684 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
55 requests over 1653ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 1.4 s LCP 11.7 shttps://medlineplus.gov// https://medlineplus.gov/ — 200 — 27.5 KiB — 104 ms — h2https://medlineplus.gov/css/common_new.css?1768476554427/css/common_new.css?1768476554427 https://medlineplus.gov/css/common_new.css?1768476554427 — 200 — 14.7 KiB — 27 ms — h2https://medlineplus.gov/uswds/css/uswds_styles.css/uswds/css/uswds_styles.css https://medlineplus.gov/uswds/css/uswds_styles.css — 200 — 5.4 KiB — 16 ms — h2https://medlineplus.gov/css/homepage_new.css/css/homepage_new.css https://medlineplus.gov/css/homepage_new.css — 200 — 4.0 KiB — 387 ms — h2https://medlineplus.gov/uswds/js/uswds-init.min.js/uswds/js/uswds-init.min.js https://medlineplus.gov/uswds/js/uswds-init.min.js — 200 — 2.0 KiB — 18 ms — h2https://medlineplus.gov/uswds/img/us_flag_small.png/uswds/img/us_flag_small.png https://medlineplus.gov/uswds/img/us_flag_small.png — 200 — 2.2 KiB — 23 ms — h2https://medlineplus.gov/uswds/img/icon-dot-gov.svg/uswds/img/icon-dot-gov.svg https://medlineplus.gov/uswds/img/icon-dot-gov.svg — 200 — 2.4 KiB — 22 ms — h2https://medlineplus.gov/uswds/img/icon-https.svg/uswds/img/icon-https.svg https://medlineplus.gov/uswds/img/icon-https.svg — 200 — 2.3 KiB — 7 ms — h2https://medlineplus.gov/images/nihlogo.png/images/nihlogo.png https://medlineplus.gov/images/nihlogo.png — 200 — 3.1 KiB — 10 ms — h2https://medlineplus.gov/images/m_logo_primary.png/images/m_logo_primary.png https://medlineplus.gov/images/m_logo_primary.png — 200 — 8.2 KiB — 339 ms — h2https://medlineplus.gov/jslib/jquery-3.6.0.min.js/jslib/jquery-3.6.0.min.js https://medlineplus.gov/jslib/jquery-3.6.0.min.js — 200 — 31.9 KiB — 8 ms — h2https://medlineplus.gov/jslib/mplus-frontend-controls-new.js/jslib/mplus-frontend-controls-new.... https://medlineplus.gov/jslib/mplus-frontend-controls-new.js — 200 — 8.8 KiB — 7 ms — h2https://medlineplus.gov/jslib/mplus-share.js?id=1112022/jslib/mplus-share.js?id=1112022 https://medlineplus.gov/jslib/mplus-share.js?id=1112022 — 200 — 5.1 KiB — 6 ms — h2https://medlineplus.gov/jslib/control.js/jslib/control.js https://medlineplus.gov/jslib/control.js — 200 — 4.3 KiB — 6 ms — h2https://medlineplus.gov/uswds/js/uswds.min.js/uswds/js/uswds.min.js https://medlineplus.gov/uswds/js/uswds.min.js — 200 — 26.9 KiB — 7 ms — h2https://medlineplus.gov/images/featured/HealthySleep_share2_featured.jpg/images/featured/HealthySleep_share... https://medlineplus.gov/images/featured/HealthySleep_share2_featured.jpg — 200 — 38.1 KiB — 349 ms — h2https://medlineplus.gov/images/feed.png/images/feed.png https://medlineplus.gov/images/feed.png — 200 — 2.4 KiB — 5 ms — h2https://medlineplus.gov/images/return-top.png/images/return-top.png https://medlineplus.gov/images/return-top.png — 200 — 2.7 KiB — 8 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-MMVM77www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-MMVM77 — 200 — 146.1 KiB — 38 ms — h2https://medlineplus.gov/uswds/img/usa-icons/expand_more.svg/uswds/img/usa-icons/expand_more.sv... https://medlineplus.gov/uswds/img/usa-icons/expand_more.svg — 200 — 1.8 KiB — 6 ms — h2https://medlineplus.gov/css/img/mplus-sprite.png/css/img/mplus-sprite.png https://medlineplus.gov/css/img/mplus-sprite.png — 200 — 40.9 KiB — 10 ms — h2https://medlineplus.gov/css/img/home-icons/home-icon-ht.png/css/img/home-icons/home-icon-ht.pn... https://medlineplus.gov/css/img/home-icons/home-icon-ht.png — 200 — 4.6 KiB — 350 ms — h2https://medlineplus.gov/css/img/home-icons/home-icon-e.png/css/img/home-icons/home-icon-e.png https://medlineplus.gov/css/img/home-icons/home-icon-e.png — 200 — 4.2 KiB — 14 ms — h2https://medlineplus.gov/css/img/home-icons/home-icon-g.png/css/img/home-icons/home-icon-g.png https://medlineplus.gov/css/img/home-icons/home-icon-g.png — 200 — 4.9 KiB — 16 ms — h2https://medlineplus.gov/css/img/home-icons/home-icon-ds.png/css/img/home-icons/home-icon-ds.pn... https://medlineplus.gov/css/img/home-icons/home-icon-ds.png — 200 — 5.2 KiB — 18 ms — h2https://medlineplus.gov/css/img/home-icons/home-icon-mt.png/css/img/home-icons/home-icon-mt.pn... https://medlineplus.gov/css/img/home-icons/home-icon-mt.png — 200 — 4.0 KiB — 20 ms — h2https://medlineplus.gov/css/img/home-icons/home-icon-r.png/css/img/home-icons/home-icon-r.png https://medlineplus.gov/css/img/home-icons/home-icon-r.png — 200 — 4.9 KiB — 22 ms — h2https://medlineplus.gov/css/img/home-icons/home-ft-icon-mz.png/css/img/home-icons/home-ft-icon-mz... https://medlineplus.gov/css/img/home-icons/home-ft-icon-mz.png — 200 — 4.3 KiB — 21 ms — h2https://medlineplus.gov/css/img/home-icons/home-ft-icon-ct.png/css/img/home-icons/home-ft-icon-ct... https://medlineplus.gov/css/img/home-icons/home-ft-icon-ct.png — 200 — 4.6 KiB — 23 ms — h2https://medlineplus.gov/uswds/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2/uswds/fonts/source-sans-pro/source... https://medlineplus.gov/uswds/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 200 — 21.8 KiB — 8 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 1.4 s LCP 11.7 shttps://medlineplus.gov// https://medlineplus.gov/ — 200 — 27.5 KiB — 104 ms — h2https://medlineplus.gov/css/common_new.css?1768476554427/css/common_new.css?1768476554427 https://medlineplus.gov/css/common_new.css?1768476554427 — 200 — 14.7 KiB — 27 ms — h2https://medlineplus.gov/uswds/css/uswds_styles.css/uswds/css/uswds_styles.css https://medlineplus.gov/uswds/css/uswds_styles.css — 200 — 5.4 KiB — 16 ms — h2https://medlineplus.gov/css/homepage_new.css/css/homepage_new.css https://medlineplus.gov/css/homepage_new.css — 200 — 4.0 KiB — 387 ms — h2https://medlineplus.gov/uswds/js/uswds-init.min.js/uswds/js/uswds-init.min.js https://medlineplus.gov/uswds/js/uswds-init.min.js — 200 — 2.0 KiB — 18 ms — h2https://medlineplus.gov/uswds/img/us_flag_small.png/uswds/img/us_flag_small.png https://medlineplus.gov/uswds/img/us_flag_small.png — 200 — 2.2 KiB — 23 ms — h2https://medlineplus.gov/uswds/img/icon-dot-gov.svg/uswds/img/icon-dot-gov.svg https://medlineplus.gov/uswds/img/icon-dot-gov.svg — 200 — 2.4 KiB — 22 ms — h2https://medlineplus.gov/uswds/img/icon-https.svg/uswds/img/icon-https.svg https://medlineplus.gov/uswds/img/icon-https.svg — 200 — 2.3 KiB — 7 ms — h2https://medlineplus.gov/images/nihlogo.png/images/nihlogo.png https://medlineplus.gov/images/nihlogo.png — 200 — 3.1 KiB — 10 ms — h2https://medlineplus.gov/images/m_logo_primary.png/images/m_logo_primary.png https://medlineplus.gov/images/m_logo_primary.png — 200 — 8.2 KiB — 339 ms — h2https://medlineplus.gov/jslib/jquery-3.6.0.min.js/jslib/jquery-3.6.0.min.js https://medlineplus.gov/jslib/jquery-3.6.0.min.js — 200 — 31.9 KiB — 8 ms — h2https://medlineplus.gov/jslib/mplus-frontend-controls-new.js/jslib/mplus-frontend-controls-new.... https://medlineplus.gov/jslib/mplus-frontend-controls-new.js — 200 — 8.8 KiB — 7 ms — h2https://medlineplus.gov/jslib/mplus-share.js?id=1112022/jslib/mplus-share.js?id=1112022 https://medlineplus.gov/jslib/mplus-share.js?id=1112022 — 200 — 5.1 KiB — 6 ms — h2https://medlineplus.gov/jslib/control.js/jslib/control.js https://medlineplus.gov/jslib/control.js — 200 — 4.3 KiB — 6 ms — h2https://medlineplus.gov/uswds/js/uswds.min.js/uswds/js/uswds.min.js https://medlineplus.gov/uswds/js/uswds.min.js — 200 — 26.9 KiB — 7 ms — h2https://medlineplus.gov/images/featured/HealthySleep_share2_featured.jpg/images/featured/HealthySleep_share... https://medlineplus.gov/images/featured/HealthySleep_share2_featured.jpg — 200 — 38.1 KiB — 349 ms — h2https://medlineplus.gov/images/feed.png/images/feed.png https://medlineplus.gov/images/feed.png — 200 — 2.4 KiB — 5 ms — h2https://medlineplus.gov/images/return-top.png/images/return-top.png https://medlineplus.gov/images/return-top.png — 200 — 2.7 KiB — 8 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-MMVM77www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-MMVM77 — 200 — 146.1 KiB — 38 ms — h2https://medlineplus.gov/uswds/img/usa-icons/expand_more.svg/uswds/img/usa-icons/expand_more.sv... https://medlineplus.gov/uswds/img/usa-icons/expand_more.svg — 200 — 1.8 KiB — 6 ms — h2https://medlineplus.gov/css/img/mplus-sprite.png/css/img/mplus-sprite.png https://medlineplus.gov/css/img/mplus-sprite.png — 200 — 40.9 KiB — 10 ms — h2https://medlineplus.gov/css/img/home-icons/home-icon-ht.png/css/img/home-icons/home-icon-ht.pn... https://medlineplus.gov/css/img/home-icons/home-icon-ht.png — 200 — 4.6 KiB — 350 ms — h2https://medlineplus.gov/css/img/home-icons/home-icon-e.png/css/img/home-icons/home-icon-e.png https://medlineplus.gov/css/img/home-icons/home-icon-e.png — 200 — 4.2 KiB — 14 ms — h2https://medlineplus.gov/css/img/home-icons/home-icon-g.png/css/img/home-icons/home-icon-g.png 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h2https://www.nlm.nih.gov/core/nlm-autocomplete/1.1/nlm-autocomplete.jswww.nlm.nih.gov/core/nlm-autocomple... https://www.nlm.nih.gov/core/nlm-autocomplete/1.1/nlm-autocomplete.js — 200 — 6.3 KiB — 76 ms — h2https://www.googletagmanager.com/gtag/js?id=G-7147EPK006&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-7147EPK006&cx=c&gtm=4e64h1 — 200 — 161.3 KiB — 52 ms — h2https://www.googletagmanager.com/gtag/js?id=G-P1FPTH9PL4&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-P1FPTH9PL4&cx=c&gtm=4e64h1 — 200 — 156.5 KiB — 43 ms — h2https://script.crazyegg.com/pages/scripts/0027/2050.jsscript.crazyegg.com/pages/scripts/0... https://script.crazyegg.com/pages/scripts/0027/2050.js — 200 — 2.7 KiB — 26 ms — h3https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=HHS&subagency=NIH&sp=query&enhlink=truedap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=HHS&subagency=NIH&sp=query&enhlink=true — 200 — 9.4 KiB — 35 ms — h3https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 25 ms — h2https://script.crazyegg.com/pages/data-scripts/0027/2050/site/medlineplus.gov.json?t=1script.crazyegg.com/pages/data-scri... https://script.crazyegg.com/pages/data-scripts/0027/2050/site/medlineplus.gov.json?t=1 — 200 — 747 B — 29 ms — h3https://www.nlm.nih.gov/core/nlm-notifyExternal/1.0/nlm-notifyExternal.jswww.nlm.nih.gov/core/nlm-notifyExte... https://www.nlm.nih.gov/core/nlm-notifyExternal/1.0/nlm-notifyExternal.js — 200 — 1.1 KiB — 61 ms — h2https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.jsdap.digitalgov.gov/web-vitals/dist/... https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js — 200 — 4.5 KiB — 15 ms — h3https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4Lwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L — 200 — 147.2 KiB — 58 ms — h3https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1 — 200 — 147.1 KiB — 61 ms — h3https://www.google-analytics.com/plugins/ua/linkid.jswww.google-analytics.com/plugins/ua... https://www.google-analytics.com/plugins/ua/linkid.js — 200 — 995 B — 33 ms — h2https://nlmoccs.report-uri.com/r/d/csp/reportOnlynlmoccs.report-uri.com/r/d/csp/repo... https://nlmoccs.report-uri.com/r/d/csp/reportOnly — 429 — 629 B — 30 ms — h3https://nlmoccs.report-uri.com/r/d/csp/reportOnlynlmoccs.report-uri.com/r/d/csp/repo... https://nlmoccs.report-uri.com/r/d/csp/reportOnly — 429 — 592 B — 10 ms — h3https://www.google-analytics.com/j/collect?v=1&_v=j102&aip=1&a=1411614850&t=pageview&_s=1&dl=https%3A%2F%2Fmedlineplus.gov%2F&ul=en-us&dt=MedlinePlus%20-%20Health%20Information%20from%20the%20National%20Library%20of%20Medicine&sr=412x823&vp=412x823&_u=aGBACEAjBAAAACAAI~&jid=438945164&gjid=1011494117&cid=27302469.1776799492&tid=UA-77373749-2&_gid=344377495.1776799492&_r=1&_slc=1&gtm=45He64h1n71MMVM77v72197367za200zd72197367&cg1=Other&cd1=Mozilla%2F5.0%20(Linux%3B%20Android%2011%3B%20moto%20g%20power%20(2022))%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F146.0.0.0%20Mobile%20Safari%2F537.36&cd2=1776799491805.m0gzy7l&cd5=199&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400~117384406&npa=1&z=491292391www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&aip=1&a=1411614850&t=pageview&_s=1&dl=https%3A%2F%2Fmedlineplus.gov%2F&ul=en-us&dt=MedlinePlus%20-%20Health%20Information%20from%20the%20National%20Library%20of%20Medicine&sr=412x823&vp=412x823&_u=aGBACEAjBAAAACAAI~&jid=438945164&gjid=1011494117&cid=27302469.1776799492&tid=UA-77373749-2&_gid=344377495.1776799492&_r=1&_slc=1&gtm=45He64h1n71MMVM77v72197367za200zd72197367&cg1=Other&cd1=Mozilla%2F5.0%20(Linux%3B%20Android%2011%3B%20moto%20g%20power%20(2022))%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F146.0.0.0%20Mobile%20Safari%2F537.36&cd2=1776799491805.m0gzy7l&cd5=199&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400~117384406&npa=1&z=491292391 — 200 — 26 B — 10 ms — h3https://nlmoccs.report-uri.com/r/d/csp/reportOnlynlmoccs.report-uri.com/r/d/csp/repo... https://nlmoccs.report-uri.com/r/d/csp/reportOnly — 429 — 593 B — 10 ms — h3https://zn0mtvfxokez0eitv-nlmenterprise.siteintercept.qualtrics.com/WRSiteInterceptEngine/?Q_ZID=ZN_0MtvfxoKez0EItv&Q_LOC=https%3A%2F%2Fmedlineplus.gov%2F&t=1776799492332zn0mtvfxokez0eitv-nlmenterprise.sit... https://zn0mtvfxokez0eitv-nlmenterprise.siteintercept.qualtrics.com/WRSiteInterceptEngine/?Q_ZID=ZN_0MtvfxoKez0EItv&Q_LOC=https%3A%2F%2Fmedlineplus.gov%2F&t=1776799492332 — 200 — 4.6 KiB — 30 ms — h2https://medlineplus.gov/images/favicon.ico/images/favicon.ico https://medlineplus.gov/images/favicon.ico — 200 — 2.8 KiB — 7 ms — h2https://siteintercept.qualtrics.com/dxjsmodule/37.7ea1ffe71ad8c0799cc1.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=medlineplus.govsiteintercept.qualtrics.com/dxjsmod... https://siteintercept.qualtrics.com/dxjsmodule/37.7ea1ffe71ad8c0799cc1.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=medlineplus.gov — 200 — 18.6 KiB — 22 ms — h2https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=medlineplus.govsiteintercept.qualtrics.com/dxjsmod... https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=medlineplus.gov — 200 — 35.9 KiB — 17 ms — h2https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Targeting.php?Q_ZoneID=ZN_0MtvfxoKez0EItv&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=websiteintercept.qualtrics.com/WRSiteI... https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Targeting.php?Q_ZoneID=ZN_0MtvfxoKez0EItv&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web — 200 — 1.5 KiB — 107 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
76% of JavaScript execution is third-party
First-party Third-party 3172ms · 812KB · $55/mo
Google Tag Manager
Tag Manager
Costly
Execution 557ms
Transfer 146 KB
Unused 39%
Monthly Cost $10/mo
Google Tag Manager
Tag Manager
Costly
Execution 542ms
Transfer 161 KB
Unused 40%
Monthly Cost $9/mo
Google Tag Manager
Tag Manager
Costly
Execution 480ms
Transfer 157 KB
Unused 40%
Monthly Cost $8/mo
Unattributable
Other
Costly
Execution 465ms
Transfer 0 KB
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 398ms
Transfer 147 KB
Unused 42%
Monthly Cost $7/mo
dap.digitalgov.gov
Other
Costly
Execution 220ms
Transfer 4 KB
Monthly Cost $4/mo
siteintercept.qualtrics.com
Other
Optional
Execution 152ms
Transfer 19 KB
Monthly Cost $3/mo
Google Analytics
Analytics
Optional
Execution 132ms
Transfer 21 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 112ms
Transfer 147 KB
Unused 72%
Monthly Cost $2/mo
dap.digitalgov.gov
Other
Optional
Execution 111ms
Transfer 9 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 557ms and costs ~$10/month
  • Google Tag Manager adds 542ms and costs ~$9/month
  • Google Tag Manager adds 480ms and costs ~$8/month
  • Unattributable adds 465ms and costs ~$8/month
  • Google Tag Manager adds 398ms and costs ~$7/month
  • dap.digitalgov.gov adds 220ms and costs ~$4/month

76% 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

Google Tag Manager takes 557ms 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 542ms 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 480ms 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

Unattributable takes 465ms 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 398ms 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

dap.digitalgov.gov takes 220ms 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 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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