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https://cancer.gov

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
3
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
71
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.

3.92 s

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

4.15 s

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

286 ms

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

0.005

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

3.92 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.

10.48 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 5 REVIEW 3 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
43 resources · 1.7 MB · 89 KB savings available
FIX
43 resources · 1.7 MB · 89 KB savings available
Warning::
Page weight 715 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~89 KB of savings available
Warning::
42 third-party resources (100% of weight)
Info::
1 resources over 200KB
43 resources · 1.7 MiB · 42 third-party 715.5 KiB over 1MB target
Image 74% · 1.3 MiB
JavaScript 19% · 321.9 KiB
Font 3% · 57.6 KiB
CSS 3% · 46.9 KiB
Document 1% · 10.4 KiB
Other 1% · 9.7 KiB

~88.9 KiB of savings available

Remove unused JavaScript: 88.9 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

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

C
Page Weight Budget
Action
1.7 MB transferred, 43 requests
REVIEW
1.7 MB transferred, 43 requests
Info::
Page weighs 3.1 MB (1.7 MB transferred)
Warning::
Images are 1.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.3 MB
Info::
43 HTTP requests
Info::
Estimated 0.36 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
43 requests
0.36 g CO2 per page load
Images 1.3 MiB 74%
JavaScript 321.9 KiB 19%
Fonts 57.6 KiB 3%
CSS 46.9 KiB 3%
HTML 10.4 KiB 1%
Other 7.5 KiB 0%
Other 1.9 KiB 0%
Other 549 B 0%
Other 465 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

B
Image Optimization
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Warning::
https://www.cancer.gov/sites/www/files/ncids_heade... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
9 images 1.3 MB
0 oversized -0 KB
9 legacy format
1 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

C
JS Execution Cost
Action
1743ms total JS execution
REVIEW
1743ms total JS execution
Warning::
https://assets.adobedtm.com/6a4249cd0a2c/949e98979...: 349ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 332ms CPU time
Warning::
https://script.crazyegg.com/pages/versioned/common...: 313ms CPU time
Warning::
https://www.cancer.gov/: 294ms CPU time
Info::
Unattributable: 230ms CPU time
Warning::
Third-party scripts: 1743ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Style & Layout 19% Other 17% Script Parsing & Compilation 7% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://assets.adobedtm.com/6a4249cd0a2c/949e98979342/launch-5f2a5357bf66.min.js349ms132ms37ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L332ms277ms53ms3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js313ms265ms21ms3rd
https://www.cancer.gov/294ms10ms2ms3rd
Unattributable230ms7ms0ms3rd
https://script.crazyegg.com/pages/scripts/0076/4407.js100ms94ms1ms3rd
https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.js73ms63ms9ms3rd
https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/js/ncids-minimal.js?tdm6fs51ms26ms8ms3rd
B
JS Bundles
15 scripts, 89 KB unused
REVIEW
15 scripts, 89 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.crazyegg.com/pages/versioned/common...: 28 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 89 KB
89 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB60 KB (41%)✓3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js55 KB28 KB (52%)✓3rd
https://assets.adobedtm.com/6a4249cd0a2c/949e98979342/1bd6a83c2894/RC1bcdb10700df439ca0c8fe99a78c7c38-source.min.js1 KB—✓3rd
https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/js/ncids-minimal.js?tdm6fs14 KB—✓3rd
https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/js/ncids-home-landing.js?tdm6fs3 KB—✓3rd
https://script.crazyegg.com/pages/scripts/0076/4407.js3 KB—✓3rd
https://assets.adobedtm.com/6a4249cd0a2c/949e98979342/launch-5f2a5357bf66.min.js47 KB—✓3rd
https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.min.js2 KB—✓3rd
blob:https://www.cancer.gov/267c032c-6e90-4c7f-a7a6-46c6ca05e4d8-0 KB—✓3rd
blob:https://www.cancer.gov/20bdd232-2660-4611-a291-18906c62ef3f0 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

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
3 fonts (58 KB)
PASS
3 fonts (58 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

58 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.9 s LCP 4.1 shttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 8 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLEj6Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 7.8 KiB — 13 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 9 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 8 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 13 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
pxiEyp8kv8JHgFVrJJfecnF... woff2 swap
Size 8 KB
Load time 9 ms
Start 1.1 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
3
preload
—
dns-prefetch
—
prefetch
—

3 resource hints configured

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
43 requests over 2386ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.9 s LCP 4.1 shttps://cancer.gov// https://cancer.gov/ — 301 — 181 B — 630 ms — http/1.0https://www.cancer.gov/www.cancer.gov/ https://www.cancer.gov/ — 200 — 10.4 KiB — 204 ms — h2https://assets.adobedtm.com/6a4249cd0a2c/949e98979342/launch-5f2a5357bf66.min.jsassets.adobedtm.com/6a4249cd0a2c/94... https://assets.adobedtm.com/6a4249cd0a2c/949e98979342/launch-5f2a5357bf66.min.js — 200 — 47.1 KiB — 13 ms — h2https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/cgov/static/images/design-elements/icons/favicons/site.webmanifestwww.cancer.gov/profiles/custom/cgov... https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/cgov/static/images/design-elements/icons/favicons/site.webmanifest — 200 — 465 B — 22 ms — h2https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.jsassets.adobedtm.com/extensions/EP31... https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.js — 200 — 13.0 KiB — 4 ms — h2https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.min.jsassets.adobedtm.com/extensions/EP31... https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.min.js — 200 — 1.8 KiB — 5 ms — h2https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300;0,400;0,600;0,700;1,300;1,400;1,600;1,700&family=Poppins:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400;1,500;1,600&family=Roboto+Mono:ital,wght@0,300;0,400;0,700;1,300;1,400;1,700&display=swapfonts.googleapis.com/css2?family=Op... https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300;0,400;0,600;0,700;1,300;1,400;1,600;1,700&family=Poppins:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400;1,500;1,600&family=Roboto+Mono:ital,wght@0,300;0,400;0,700;1,300;1,400;1,700&display=swap — 200 — 3.4 KiB — 121 ms — h2https://www.cancer.gov/sites/www/files/css/css_L5Bo1BLOIOXD6lsbSfG9GpUljueGZgAEybCrTcTe4jw.css?delta=0&language=en&theme=ncids_trans&include=eJxFyEsKwCAMBcAL-TlSiU1QQWPI00VvX7rqbhi9O-PaToqsn2NbU-Ig5a41GDlVJ2vI7MdopH_SUTtldDThgAdbZi4EeQFT5SCIwww.cancer.gov/sites/www/files/css/... https://www.cancer.gov/sites/www/files/css/css_L5Bo1BLOIOXD6lsbSfG9GpUljueGZgAEybCrTcTe4jw.css?delta=0&language=en&theme=ncids_trans&include=eJxFyEsKwCAMBcAL-TlSiU1QQWPI00VvX7rqbhi9O-PaToqsn2NbU-Ig5a41GDlVJ2vI7MdopH_SUTtldDThgAdbZi4EeQFT5SCI — 200 — 1.4 KiB — 31 ms — h2https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/css/ncids-minimal.css?tdm6fswww.cancer.gov/profiles/custom/cgov... https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/css/ncids-minimal.css?tdm6fs — 200 — 20.5 KiB — 36 ms — h2https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/css/ncids-home-landing.css?tdm6fswww.cancer.gov/profiles/custom/cgov... https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/css/ncids-home-landing.css?tdm6fs — 200 — 21.6 KiB — 43 ms — h2https://www.cancer.gov/sites/www/files/ncids_header/logos/Logo_NCI_Mobile.svgwww.cancer.gov/sites/www/files/ncid... https://www.cancer.gov/sites/www/files/ncids_header/logos/Logo_NCI_Mobile.svg — 200 — 1.5 KiB — 39 ms — h2https://www.cancer.gov/sites/www/files/ncids_hero/field_mobile_large_hero/2023-07/hero-image-homepage-mobilelarge.jpgwww.cancer.gov/sites/www/files/ncid... https://www.cancer.gov/sites/www/files/ncids_hero/field_mobile_large_hero/2023-07/hero-image-homepage-mobilelarge.jpg — 200 — 101.1 KiB — 45 ms — h2https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/js/ncids-minimal.js?tdm6fswww.cancer.gov/profiles/custom/cgov... https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/js/ncids-minimal.js?tdm6fs — 200 — 13.9 KiB — 36 ms — h2https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/js/ncids-home-landing.js?tdm6fswww.cancer.gov/profiles/custom/cgov... https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/js/ncids-home-landing.js?tdm6fs — 200 — 2.7 KiB — 45 ms — h2https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/cb0b79fbf9f17be3cf61.pngwww.cancer.gov/profiles/custom/cgov... https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/cb0b79fbf9f17be3cf61.png — 200 — 525 B — 56 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_guide_card_16x9/public/ncids_guide_card_img_desc/field_image_guide_card/2023-07/People%20Affected%2016-9.jpg?itok=vSWm8yvZwww.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_guide_card_16x9/public/ncids_guide_card_img_desc/field_image_guide_card/2023-07/People%20Affected%2016-9.jpg?itok=vSWm8yvZ — 200 — 88.0 KiB — 56 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_guide_card_16x9/public/ncids_guide_card_img_desc/field_image_guide_card/2023-07/Researchers%2016-9.jpg?itok=dbTEEFoWwww.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_guide_card_16x9/public/ncids_guide_card_img_desc/field_image_guide_card/2023-07/Researchers%2016-9.jpg?itok=dbTEEFoW — 200 — 70.2 KiB — 61 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_promo_16x9/public/cgov_image/media_image/2025-11/2025-09-30-NCI-Director-Dr.%20Anthony%20Letai-03.JPG?h=40096822&itok=icdJjG3swww.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_promo_16x9/public/cgov_image/media_image/2025-11/2025-09-30-NCI-Director-Dr.%20Anthony%20Letai-03.JPG?h=40096822&itok=icdJjG3s — 200 — 110.2 KiB — 63 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_promo_16x9/public/cgov_image/media_image/2025-09/AP-FY27-Web-Graphics_DigitalSignage-Banner-1-1x1.png?h=44db4dcc&itok=8QBQcrc6www.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_promo_16x9/public/cgov_image/media_image/2025-09/AP-FY27-Web-Graphics_DigitalSignage-Banner-1-1x1.png?h=44db4dcc&itok=8QBQcrc6 — 200 — 920.2 KiB — 167 ms — h2https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2fonts.gstatic.com/s/opensans/v44/me... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 200 — 42.0 KiB — 8 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 200 — 7.8 KiB — 13 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 200 — 7.7 KiB — 9 ms — h3https://script.crazyegg.com/pages/scripts/0076/4407.jsscript.crazyegg.com/pages/scripts/0... https://script.crazyegg.com/pages/scripts/0076/4407.js — 200 — 2.7 KiB — 19 ms — h3https://assets.adobedtm.com/6a4249cd0a2c/949e98979342/1bd6a83c2894/RC1bcdb10700df439ca0c8fe99a78c7c38-source.min.jsassets.adobedtm.com/6a4249cd0a2c/94... https://assets.adobedtm.com/6a4249cd0a2c/949e98979342/1bd6a83c2894/RC1bcdb10700df439ca0c8fe99a78c7c38-source.min.js — 200 — 776 B — 10 ms — h2https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/84649ddddcc0da925ace.svgwww.cancer.gov/profiles/custom/cgov... https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/84649ddddcc0da925ace.svg — 200 — 451 B — 72 ms — 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h2https://assets.adobedtm.com/6a4249cd0a2c/949e98979342/1bd6a83c2894/RCcdc0a9518ff54d37b1c040be774e0cd0-source.min.jsassets.adobedtm.com/6a4249cd0a2c/94... https://assets.adobedtm.com/6a4249cd0a2c/949e98979342/1bd6a83c2894/RCcdc0a9518ff54d37b1c040be774e0cd0-source.min.js — 200 — 611 B — 3 ms — h2https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/cgov/static/images/design-elements/icons/favicons/favicon.svgwww.cancer.gov/profiles/custom/cgov... https://www.cancer.gov/profiles/custom/cgov_site/themes/custom/cgov/static/images/design-elements/icons/favicons/favicon.svg — 200 — 702 B — 68 ms — h2https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=HHS&subagency=NCIdap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=HHS&subagency=NCI — 200 — 9.4 KiB — 22 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 — 4.6 KiB — 6 ms — h2https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4Lwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L — 200 — 147.5 KiB — 318 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zd9131934939&_p=1776799828806&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1356740789.1776799829&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~117266401~117884344&dl=https%3A%2F%2Fcancer.gov%2F&dt=Comprehensive%20Cancer%20Information%20-%20NCI&dr=&sid=1776799829&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&ep.agency=HHS&ep.subagency=NCI&ep.site_topic=unspecified%3Acancer.gov&ep.site_platform=unspecified%3Acancer.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=cancer.gov&tfd=2255www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zd9131934939&_p=1776799828806&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1356740789.1776799829&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~117266401~117884344&dl=https%3A%2F%2Fcancer.gov%2F&dt=Comprehensive%20Cancer%20Information%20-%20NCI&dr=&sid=1776799829&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&ep.agency=HHS&ep.subagency=NCI&ep.site_topic=unspecified%3Acancer.gov&ep.site_platform=unspecified%3Acancer.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=cancer.gov&tfd=2255 — 204 — 549 B — 131 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 1743ms · 299KB · $23/mo
assets.adobedtm.com
Other
Costly
Execution 349ms
Transfer 47 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 332ms
Transfer 147 KB
Unused 41%
Monthly Cost $4/mo
script.crazyegg.com
Other
Costly
Execution 313ms
Transfer 55 KB
Unused 52%
Monthly Cost $4/mo
www.cancer.gov
Other
Costly
Execution 294ms
Transfer 10 KB
Monthly Cost $4/mo
Unattributable
Other
Costly
Execution 230ms
Transfer 0 KB
Monthly Cost $3/mo
script.crazyegg.com
Other
Optional
Execution 100ms
Transfer 3 KB
Monthly Cost $1/mo
script.crazyegg.com
Other
Optional
Execution 73ms
Transfer 23 KB
Monthly Cost $1/mo
www.cancer.gov
Other
Optional
Execution 51ms
Transfer 14 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • assets.adobedtm.com adds 349ms and costs ~$5/month
  • Google Tag Manager adds 332ms and costs ~$4/month
  • script.crazyegg.com adds 313ms and costs ~$4/month
  • www.cancer.gov adds 294ms and costs ~$4/month
  • Unattributable adds 230ms and costs ~$3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

assets.adobedtm.com takes 349ms 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 332ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

script.crazyegg.com takes 313ms 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

52% of script.crazyegg.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

www.cancer.gov takes 294ms 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 230ms 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

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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