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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
3
REVIEW
3
PASS
7
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.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

954 ms

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

1.09 s

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

5 ms

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

0.018

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

1.25 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.

1.97 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
7 PASS 3 REVIEW 3 FIX
D
Third-Party Impact
Action
68% third-party, 0 ms blocking
FIX
68% third-party, 0 ms blocking
Warning::
Third-party code accounts for 68% of page weight (604.9 KiB of 895.7 KiB)
Info::
Third-party blocking time is low (0 ms)
32%
68%
First-party Third-party
D
JS Bundles
Action
17 scripts, 401 KB unused
FIX
17 scripts, 401 KB unused
Warning::
https://www.ncbi.nlm.nih.gov/core/jig/1.15.6/js/ji...: 142 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DP2X...: 62 KB unused (42%)
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-PC9...: 60 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.crazyegg.com/pages/versioned/common...: 30 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 401 KB
401 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ncbi.nlm.nih.gov/core/jig/1.15.6/js/jig.min.js183 KB142 KB (78%)✓1st
https://www.googletagmanager.com/gtag/js?id=G-DP2X732JSX&l=pingerDataLayer&cx=c&gtm=4e64h1h1148 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayer130 KB60 KB (47%)✓3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js55 KB30 KB (54%)✓3rd
https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.ncbi.nlm.nih.gov36 KB22 KB (63%)✓3rd
https://siteintercept.qualtrics.com/dxjsmodule/CoreModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=nlmenterprise31 KB22 KB (71%)✓3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=HHS&subagency=NCBI%20-%20ncbi.nlm.nih.gov&sitetopic=NCBI%20Pinger%200.39.3&siteplatform=NCBI%20Pinger%200.39.39 KB—✓3rd
https://www.ncbi.nlm.nih.gov/core/alerts/alerts.js?_=17767972409786 KB—✓1st
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js4 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

F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

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

C
Image Optimization
Action
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Warning::
https://www.ncbi.nlm.nih.gov/home/images/icons/sub... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ncbi.nlm.nih.gov/home/images/icons/dow... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ncbi.nlm.nih.gov/core/jig/1.15.6/img/c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/f... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ncbi.nlm.nih.gov/home/images/icons/res... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ncbi.nlm.nih.gov/home/images/icons/lea... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ncbi.nlm.nih.gov/home/images/icons/dev... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ncbi.nlm.nih.gov/home/images/icons/ana... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ncbi.nlm.nih.gov/coreutils/nwds/img/lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
20 images 22 KB
0 oversized -0 KB
20 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
Page Weight Inventory
55 resources · 896 KB · 401 KB savings available
REVIEW
55 resources · 896 KB · 401 KB savings available
Info::
Within 1MB page-weight target
Got: 896 KB
Info::
~401 KB of savings available
Warning::
22 third-party resources (68% of weight)
55 resources · 895.7 KiB · 22 third-party Within 1MB page-weight target
JavaScript 91% · 818.8 KiB
CSS 3% · 30.0 KiB
Image 3% · 26.0 KiB
Document 1% · 11.0 KiB
Other 1% · 9.9 KiB

~400.8 KiB of savings available

Remove unused JavaScript: 400.8 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
896 KB transferred, 55 requests
PASS
896 KB transferred, 55 requests
Info::
Page weighs 3.0 MB (896 KB transferred)
Warning::
JavaScript is 812 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 812 KB
Info::
55 HTTP requests
Info::
Estimated 0.18 g CO2 per page load
896 KB / 2.4 MB budget
896 KB transferred
55 requests
0.18 g CO2 per page load
JavaScript 812.4 KiB 91%
CSS 30.0 KiB 3%
Images 21.9 KiB 2%
Other 16.7 KiB 2%
HTML 9.5 KiB 1%
Other 4.0 KiB 0%
Other 1.2 KiB 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

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+
JS Execution Cost
464ms total JS execution
PASS
464ms total JS execution
Info::
https://www.ncbi.nlm.nih.gov/core/jig/1.15.6/js/ji...: 82ms CPU time
Info::
Unattributable: 79ms CPU time
Info::
https://script.crazyegg.com/pages/versioned/common...: 69ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PC9...: 63ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 58ms CPU time
Warning::
Third-party scripts: 382ms (82% of total)

Main Thread Breakdown

Script Evaluation 63% Other 16% Script Parsing & Compilation 11% Style & Layout 6%
ScriptTotalScriptingParse/CompileParty
https://www.ncbi.nlm.nih.gov/core/jig/1.15.6/js/jig.min.js82ms51ms16ms1st
Unattributable79ms2ms0ms3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js69ms62ms4ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayer63ms52ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L58ms48ms10ms3rd
https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.ncbi.nlm.nih.gov57ms51ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DP2X732JSX&l=pingerDataLayer&cx=c&gtm=4e64h1h156ms45ms10ms3rd
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
55 requests over 1751ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 954 ms LCP 1.1 shttps://www.ncbi.nlm.nih.gov// https://www.ncbi.nlm.nih.gov/ — 200 — 9.5 KiB — 399 ms — h2https://www.ncbi.nlm.nih.gov/core/jig/1.15.6/js/jig.min.js/core/jig/1.15.6/js/jig.min.js https://www.ncbi.nlm.nih.gov/core/jig/1.15.6/js/jig.min.js — 200 — 182.7 KiB — 398 ms — h2https://www.ncbi.nlm.nih.gov/home/components/normalize-css/normalize.css/home/components/normalize-css/norm... https://www.ncbi.nlm.nih.gov/home/components/normalize-css/normalize.css — 200 — 2.6 KiB — 105 ms — h2https://www.ncbi.nlm.nih.gov/home/components/ncbi-standards/standard_base.css/home/components/ncbi-standards/sta... https://www.ncbi.nlm.nih.gov/home/components/ncbi-standards/standard_base.css — 200 — 1.7 KiB — 105 ms — h2https://www.ncbi.nlm.nih.gov/home/new_grid.css/home/new_grid.css https://www.ncbi.nlm.nih.gov/home/new_grid.css — 200 — 327 B — 102 ms — h2https://www.ncbi.nlm.nih.gov/home/homepage.css/home/homepage.css https://www.ncbi.nlm.nih.gov/home/homepage.css — 200 — 838 B — 105 ms — h2https://www.ncbi.nlm.nih.gov/home/legacy/page.css/home/legacy/page.css https://www.ncbi.nlm.nih.gov/home/legacy/page.css — 200 — 8.9 KiB — 109 ms — h2https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/favicons/favicon-57.png/coreutils/uswds/img/favicons/favic... https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/favicons/favicon-57.png — 200 — 587 B — 106 ms — h2https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/icon-dot-gov.svg/coreutils/uswds/img/icon-dot-gov.s... https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/icon-dot-gov.svg — 200 — 427 B — 107 ms — h2https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/icon-https.svg/coreutils/uswds/img/icon-https.svg https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/icon-https.svg — 200 — 363 B — 289 ms — h2https://www.ncbi.nlm.nih.gov/coreutils/nwds/img/logos/AgencyLogo.svg/coreutils/nwds/img/logos/AgencyLog... https://www.ncbi.nlm.nih.gov/coreutils/nwds/img/logos/AgencyLogo.svg — 200 — 9.0 KiB — 288 ms — h2https://www.ncbi.nlm.nih.gov/home/images/icons/submit.svg/home/images/icons/submit.svg https://www.ncbi.nlm.nih.gov/home/images/icons/submit.svg — 200 — 482 B — 101 ms — h2https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/rlib/js/InstrumentOmnitureBaseJS/InstrumentNCBIConfigJS/InstrumentNCBIBaseJS/InstrumentPageStarterJS.js?v=1/portal/portal3rc.fcgi/rlib/js/Inst... https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/rlib/js/InstrumentOmnitureBaseJS/InstrumentNCBIConfigJS/InstrumentNCBIBaseJS/InstrumentPageStarterJS.js?v=1 — 200 — 29.5 KiB — 105 ms — h2https://www.ncbi.nlm.nih.gov/core/jig/1.15.6/css/jig.min.css/core/jig/1.15.6/css/jig.min.css https://www.ncbi.nlm.nih.gov/core/jig/1.15.6/css/jig.min.css — 200 — 15.7 KiB — 103 ms — h2https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/static/js/hfjs2.js/portal/portal3rc.fcgi/static/js/hf... https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/static/js/hfjs2.js — 200 — 5.2 KiB — 136 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 — 49 ms — h3https://www.ncbi.nlm.nih.gov/home/images/icons/download.svg/home/images/icons/download.svg https://www.ncbi.nlm.nih.gov/home/images/icons/download.svg — 200 — 456 B — 102 ms — h2https://www.ncbi.nlm.nih.gov/home/images/icons/learn.svg/home/images/icons/learn.svg https://www.ncbi.nlm.nih.gov/home/images/icons/learn.svg — 200 — 889 B — 105 ms — h2https://www.ncbi.nlm.nih.gov/home/images/icons/develop.svg/home/images/icons/develop.svg https://www.ncbi.nlm.nih.gov/home/images/icons/develop.svg — 200 — 435 B — 103 ms — h2https://www.ncbi.nlm.nih.gov/home/images/icons/analyze.svg/home/images/icons/analyze.svg https://www.ncbi.nlm.nih.gov/home/images/icons/analyze.svg — 200 — 3.7 KiB — 106 ms — h2https://www.ncbi.nlm.nih.gov/home/images/icons/research.svg/home/images/icons/research.svg https://www.ncbi.nlm.nih.gov/home/images/icons/research.svg — 200 — 993 B — 105 ms — h2https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/angle-arrow-down-primary.svg/coreutils/uswds/img/angle-arrow-do... https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/angle-arrow-down-primary.svg — 200 — 355 B — 103 ms — h2https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/4013172/img/2375536/portal/portal3rc.fcgi/4013172/img/... https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/4013172/img/2375536 — 200 — 172 B — 104 ms — h2https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/4013172/img/12285/portal/portal3rc.fcgi/4013172/img/... https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/4013172/img/12285 — 200 — 2.5 KiB — 146 ms — h2https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/4013172/img/218235/portal/portal3rc.fcgi/4013172/img/... https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/4013172/img/218235 — 200 — 322 B — 150 ms — h2https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/4013172/img/218233/portal/portal3rc.fcgi/4013172/img/... https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/4013172/img/218233 — 200 — 165 B — 148 ms — h2https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/194600/img/12244/portal/portal3rc.fcgi/194600/img/1... https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/194600/img/12244 — 200 — 362 B — 149 ms — h2https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/4054678/img/3418709/portal/portal3rc.fcgi/4054678/img/... https://www.ncbi.nlm.nih.gov/portal/portal3rc.fcgi/4054678/img/3418709 — 200 — 311 B — 146 ms — h2https://script.crazyegg.com/pages/data-scripts/0027/2050/site/www.ncbi.nlm.nih.gov.json?t=1script.crazyegg.com/pages/data-scri... https://script.crazyegg.com/pages/data-scripts/0027/2050/site/www.ncbi.nlm.nih.gov.json?t=1 — 200 — 1.9 KiB — 46 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayerwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayer — 200 — 129.9 KiB — 151 ms — h2
0 ms 500 ms 1.0 s 1.5 s FCP 954 ms LCP 1.1 shttps://www.ncbi.nlm.nih.gov// https://www.ncbi.nlm.nih.gov/ — 200 — 9.5 KiB — 399 ms — h2https://www.ncbi.nlm.nih.gov/core/jig/1.15.6/js/jig.min.js/core/jig/1.15.6/js/jig.min.js https://www.ncbi.nlm.nih.gov/core/jig/1.15.6/js/jig.min.js — 200 — 182.7 KiB — 398 ms — h2https://www.ncbi.nlm.nih.gov/home/components/normalize-css/normalize.css/home/components/normalize-css/norm... https://www.ncbi.nlm.nih.gov/home/components/normalize-css/normalize.css — 200 — 2.6 KiB — 105 ms — h2https://www.ncbi.nlm.nih.gov/home/components/ncbi-standards/standard_base.css/home/components/ncbi-standards/sta... https://www.ncbi.nlm.nih.gov/home/components/ncbi-standards/standard_base.css — 200 — 1.7 KiB — 105 ms — h2https://www.ncbi.nlm.nih.gov/home/new_grid.css/home/new_grid.css https://www.ncbi.nlm.nih.gov/home/new_grid.css — 200 — 327 B — 102 ms — h2https://www.ncbi.nlm.nih.gov/home/homepage.css/home/homepage.css https://www.ncbi.nlm.nih.gov/home/homepage.css — 200 — 838 B — 105 ms — h2https://www.ncbi.nlm.nih.gov/home/legacy/page.css/home/legacy/page.css https://www.ncbi.nlm.nih.gov/home/legacy/page.css — 200 — 8.9 KiB — 109 ms — h2https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/favicons/favicon-57.png/coreutils/uswds/img/favicons/favic... https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/favicons/favicon-57.png — 200 — 587 B — 106 ms — h2https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/icon-dot-gov.svg/coreutils/uswds/img/icon-dot-gov.s... https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/icon-dot-gov.svg — 200 — 427 B — 107 ms — h2https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/icon-https.svg/coreutils/uswds/img/icon-https.svg https://www.ncbi.nlm.nih.gov/coreutils/uswds/img/icon-https.svg — 200 — 363 B — 289 ms — h2https://www.ncbi.nlm.nih.gov/coreutils/nwds/img/logos/AgencyLogo.svg/coreutils/nwds/img/logos/AgencyLog... https://www.ncbi.nlm.nih.gov/coreutils/nwds/img/logos/AgencyLogo.svg — 200 — 9.0 KiB — 288 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
82% of JavaScript execution is third-party
First-party Third-party 382ms · 516KB · $5/mo
Unattributable
Other
Optional
Execution 79ms
Transfer 0 KB
Monthly Cost $1/mo
script.crazyegg.com
Other
Optional
Execution 69ms
Transfer 55 KB
Unused 54%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 63ms
Transfer 130 KB
Unused 47%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 58ms
Transfer 147 KB
Unused 42%
Monthly Cost $1/mo
siteintercept.qualtrics.com
Other
Optional
Execution 57ms
Transfer 36 KB
Unused 63%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 56ms
Transfer 148 KB
Unused 42%
Monthly Cost $1/mo

82% 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

54% 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

63% of siteintercept.qualtrics.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

How third-party costs are calculated

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