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https://medlineplus.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
3
REVIEW
5
PASS
5
INFO
2

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

Mobile Desktop
96
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.
92
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.

339 ms

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

808 ms

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

165 ms

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

0.026

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

613 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.88 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 5 REVIEW 3 FIX
D
Third-Party Impact
Action
70% third-party, 0 ms blocking
FIX
70% third-party, 0 ms blocking
Warning::
Third-party code accounts for 70% of page weight (906.8 KiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
30%
70%
First-party Third-party
D
JS Bundles
Action
26 scripts, 373 KB unused
FIX
26 scripts, 373 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 (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-P1FP...: 63 KB unused (41%)
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...: 31 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 373 KB
373 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64k0h2147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-7147EPK006&cx=c&gtm=4e64k0h2161 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-P1FPTH9PL4&cx=c&gtm=4e64k0h2156 KB63 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MMVM77146 KB31 KB (39%)✓3rd
https://siteintercept.qualtrics.com/dxjsmodule/CoreModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=nlmenterprise31 KB23 KB (73%)✓3rd
https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=medlineplus.gov36 KB22 KB (63%)✓3rd
https://script.crazyegg.com/pages/scripts/0027/2050.js3 KB—✓3rd
https://medlineplus.gov/jslib/control.js4 KB—✓1st
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
1.3 MB transferred, 58 requests
REVIEW
1.3 MB transferred, 58 requests
Info::
Page weighs 3.4 MB (1.3 MB transferred)
Warning::
JavaScript is 981 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 981 KB
Info::
58 HTTP requests
Info::
Estimated 0.27 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
58 requests
0.27 g CO2 per page load
JavaScript 981.4 KiB 75%
Images 140.9 KiB 11%
Other 71.0 KiB 5%
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/uswds/img/us_flag_small.pn... 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.
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

B
JS Execution Cost
890ms total JS execution
REVIEW
890ms total JS execution
Info::
https://medlineplus.gov/: 145ms CPU time
Info::
Unattributable: 139ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-MMV...: 133ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-7147...: 131ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-P1FP...: 124ms CPU time
Warning::
Third-party scripts: 645ms (72% of total)

Main Thread Breakdown

Script Evaluation 58% Other 15% Script Parsing & Compilation 14% Style & Layout 10%
ScriptTotalScriptingParse/CompileParty
https://medlineplus.gov/145ms4ms1ms1st
Unattributable139ms3ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MMVM77133ms105ms24ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7147EPK006&cx=c&gtm=4e64k0h2131ms107ms24ms3rd
https://www.googletagmanager.com/gtag/js?id=G-P1FPTH9PL4&cx=c&gtm=4e64k0h2124ms104ms20ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L118ms98ms19ms3rd
https://medlineplus.gov/jslib/jquery-3.6.0.min.js101ms63ms24ms1st
C
Page Weight Inventory
Action
58 resources · 1.3 MB · 373 KB savings available
REVIEW
58 resources · 1.3 MB · 373 KB savings available
Warning::
Page weight 279 KB over 1MB target
Got: 1.3 MB Expected: ≤ 1 MB
Info::
~373 KB of savings available
Warning::
25 third-party resources (70% of weight)
58 resources · 1.3 MiB · 25 third-party 278.8 KiB over 1MB target
JavaScript 81% · 1.0 MiB
Image 11% · 143.7 KiB
Font 3% · 43.4 KiB
CSS 3% · 34.2 KiB
Document 2% · 27.5 KiB
Other 0% · 4.5 KiB

~373.1 KiB of savings available

Remove unused JavaScript: 373.1 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 500 ms 1.0 s FCP 339 ms LCP 808 mshttps://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 — 17 ms — font-display: swap
sourcesanspro-regular-w... woff2 swap
Size 22 KB
Load time 8 ms
Start 202 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 22 KB
Load time 17 ms
Start 204 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
Network Waterfall
58 requests over 1333ms
INFO
0 ms 500 ms 1.0 s FCP 339 ms LCP 808 mshttps://medlineplus.gov// https://medlineplus.gov/ — 200 — 27.5 KiB — 24 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 — 28 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 — 22 ms — h2https://medlineplus.gov/css/homepage_new.css/css/homepage_new.css https://medlineplus.gov/css/homepage_new.css — 200 — 4.0 KiB — 9 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 — 25 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 — 19 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 — 25 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 — 13 ms — h2https://medlineplus.gov/images/nihlogo.png/images/nihlogo.png https://medlineplus.gov/images/nihlogo.png — 200 — 3.1 KiB — 12 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 — 20 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 — 53 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 — 22 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 — 50 ms — h2https://medlineplus.gov/jslib/control.js/jslib/control.js https://medlineplus.gov/jslib/control.js — 200 — 4.3 KiB — 50 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 — 82 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 — 38 ms — h2https://medlineplus.gov/images/feed.png/images/feed.png https://medlineplus.gov/images/feed.png — 200 — 2.4 KiB — 50 ms — h2https://medlineplus.gov/images/return-top.png/images/return-top.png https://medlineplus.gov/images/return-top.png — 200 — 2.7 KiB — 52 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 — 145.8 KiB — 91 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 — 48 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 — 28 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 — 31 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 — 32 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 — 34 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 — 37 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 — 45 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 — 52 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 — 41 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 — 56 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 500 ms 1.0 s FCP 339 ms LCP 808 mshttps://medlineplus.gov// https://medlineplus.gov/ — 200 — 27.5 KiB — 24 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 — 28 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 — 22 ms — h2https://medlineplus.gov/css/homepage_new.css/css/homepage_new.css https://medlineplus.gov/css/homepage_new.css — 200 — 4.0 KiB — 9 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 — 25 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 — 19 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 — 25 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 — 13 ms — h2https://medlineplus.gov/images/nihlogo.png/images/nihlogo.png https://medlineplus.gov/images/nihlogo.png — 200 — 3.1 KiB — 12 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 — 20 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 — 53 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 — 22 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 — 50 ms — h2https://medlineplus.gov/jslib/control.js/jslib/control.js https://medlineplus.gov/jslib/control.js — 200 — 4.3 KiB — 50 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 — 82 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 — 38 ms — h2https://medlineplus.gov/images/feed.png/images/feed.png https://medlineplus.gov/images/feed.png — 200 — 2.4 KiB — 50 ms — h2https://medlineplus.gov/images/return-top.png/images/return-top.png https://medlineplus.gov/images/return-top.png — 200 — 2.7 KiB — 52 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 — 145.8 KiB — 91 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 — 48 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 — 28 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 — 31 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 — 32 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 — 34 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 — 37 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 — 45 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 — 52 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 — 41 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 — 56 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
72% of JavaScript execution is third-party
First-party Third-party 645ms · 610KB · $11/mo
Unattributable
Other
Optional
Execution 139ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 133ms
Transfer 146 KB
Unused 39%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 131ms
Transfer 161 KB
Unused 41%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 124ms
Transfer 156 KB
Unused 41%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 118ms
Transfer 147 KB
Unused 42%
Monthly Cost $2/mo

72% 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

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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