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https://cancer.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
86
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.

1.35 s

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

1.92 s

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

0 ms

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

0.008

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

1.50 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.

1.92 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
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 51 requests
FIX
2.9 MB transferred, 51 requests
Warning::
Page weighs 4.3 MB (2.9 MB transferred)
Warning::
Images are 2.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.4 MB
Info::
51 HTTP requests
Info::
Estimated 0.60 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
51 requests
0.60 g CO2 per page load
Images 2.4 MiB 85%
JavaScript 321.8 KiB 11%
Fonts 57.6 KiB 2%
CSS 46.9 KiB 2%
HTML 10.4 KiB 0%
Other 7.5 KiB 0%
Other 1.9 KiB 0%
Other 549 B 0%
Other 466 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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 (2.9 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
51 resources · 2.9 MB · 89 KB savings available
FIX
51 resources · 2.9 MB · 89 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~89 KB of savings available
Warning::
50 third-party resources (100% of weight)
Info::
4 resources over 200KB
51 resources · 2.9 MiB · 50 third-party 1.9 MiB over 1MB target
Image 85% · 2.4 MiB
JavaScript 11% · 321.8 KiB
Font 2% · 57.6 KiB
CSS 2% · 46.9 KiB
Document 0% · 10.4 KiB
Other 0% · 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.

B
Image Optimization
17 images, 0 KB saveable
REVIEW
17 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.
17 images 2.4 MB
0 oversized -0 KB
17 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

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://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.js13 KB—✓3rd
https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.min.js2 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://www.cancer.gov/profiles/custom/cgov_site/themes/custom/ncids_trans/dist/js/ncids-home-landing.js?tdm6fs3 KB—✓3rd
blob:https://www.cancer.gov/c736f07a-0c62-4c1e-8087-75f200fdbdfa-0 KB—✓3rd
blob:https://www.cancer.gov/51e01510-d58c-4ed3-a311-2beea9efdd4a0 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+
JS Execution Cost
432ms total JS execution
PASS
432ms total JS execution
Info::
https://www.cancer.gov/: 139ms CPU time
Info::
https://script.crazyegg.com/pages/versioned/common...: 86ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 82ms CPU time
Info::
Unattributable: 72ms CPU time
Info::
https://assets.adobedtm.com/6a4249cd0a2c/949e98979...: 53ms CPU time
Warning::
Third-party scripts: 432ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 22% Style & Layout 16% Script Parsing & Compilation 7% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.cancer.gov/139ms3ms0ms3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js86ms75ms6ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L82ms69ms13ms3rd
Unattributable72ms2ms0ms3rd
https://assets.adobedtm.com/6a4249cd0a2c/949e98979342/launch-5f2a5357bf66.min.js53ms39ms9ms3rd
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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 1.9 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 — 14 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 — 10 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 14 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 13 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
pxiEyp8kv8JHgFVrJJfecnF... woff2 swap
Size 8 KB
Load time 10 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
51 requests over 2292ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 1.9 shttps://cancer.gov// https://cancer.gov/ — 301 — 181 B — 629 ms — http/1.0https://www.cancer.gov/www.cancer.gov/ https://www.cancer.gov/ — 200 — 10.4 KiB — 178 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 — 31 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 — 129 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 — 22 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 — 27 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 — 42 ms — h2https://www.cancer.gov/sites/www/files/ncids_header/logos/Logo_NCI.svgwww.cancer.gov/sites/www/files/ncid... https://www.cancer.gov/sites/www/files/ncids_header/logos/Logo_NCI.svg — 200 — 1.5 KiB — 24 ms — h2https://www.cancer.gov/sites/www/files/ncids_hero/field_widescreen_hero/2023-07/hero-image-homepage-wide.jpgwww.cancer.gov/sites/www/files/ncid... https://www.cancer.gov/sites/www/files/ncids_hero/field_widescreen_hero/2023-07/hero-image-homepage-wide.jpg — 200 — 328.2 KiB — 38 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 — 39 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 — 35 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 — 466 B — 36 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 — 6 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 — 4 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 — 526 B — 21 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 — 52 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 — 53 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_featured_16x9/public/cgov_image/media_image/2026-01/iStock-2174865904%20%281%29.jpg?h=87428f5e&itok=CKiwSigYwww.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_featured_16x9/public/cgov_image/media_image/2026-01/iStock-2174865904%20%281%29.jpg?h=87428f5e&itok=CKiwSigY — 200 — 100.8 KiB — 91 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_featured_16x9/public/cgov_image/media_image/2025-05/Cancer%20Currents-Young%20man%20with%20doctor-iStock.jpg?h=78148091&itok=uETsfYT8www.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_featured_16x9/public/cgov_image/media_image/2025-05/Cancer%20Currents-Young%20man%20with%20doctor-iStock.jpg?h=78148091&itok=uETsfYT8 — 200 — 63.9 KiB — 68 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_featured_16x9/public/cgov_image/media_image/2025-05/Stromal%20disruption.jpg?h=4233ef75&itok=-lP8tRXSwww.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_featured_16x9/public/cgov_image/media_image/2025-05/Stromal%20disruption.jpg?h=4233ef75&itok=-lP8tRXS — 200 — 233.8 KiB — 92 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_promo_1x1/public/cgov_image/media_image/2025-11/2025-09-30-NCI-Director-Dr.%20Anthony%20Letai-03.JPG?h=807fec09&itok=evwebvx3www.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_promo_1x1/public/cgov_image/media_image/2025-11/2025-09-30-NCI-Director-Dr.%20Anthony%20Letai-03.JPG?h=807fec09&itok=evwebvx3 — 200 — 121.5 KiB — 58 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_promo_1x1/public/cgov_image/media_image/2025-09/AP-FY27-Web-Graphics_DigitalSignage-Banner-1-1x1.png?h=5d1fca7d&itok=CqzCr70cwww.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_promo_1x1/public/cgov_image/media_image/2025-09/AP-FY27-Web-Graphics_DigitalSignage-Banner-1-1x1.png?h=5d1fca7d&itok=CqzCr70c — 200 — 745.0 KiB — 130 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_promo_1x1/public/cgov_image/ncids_promo_art_1x1/2023-12/CIS-1-1-01.jpg?itok=dVKy-BcSwww.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_promo_1x1/public/cgov_image/ncids_promo_art_1x1/2023-12/CIS-1-1-01.jpg?itok=dVKy-BcS — 200 — 105.5 KiB — 71 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_featured_16x9/public/cgov_image/media_image/100/100/3/files/senior-leadership-illustration-feature-card.gif?h=542dcc49&itok=tWI2J9Uewww.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_featured_16x9/public/cgov_image/media_image/100/100/3/files/senior-leadership-illustration-feature-card.gif?h=542dcc49&itok=tWI2J9Ue — 200 — 138.7 KiB — 107 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_featured_16x9/public/cgov_image/media_image/900/800/files/nci-shady-grove-building-article.jpg?h=24088f54&itok=LjoM-x6Wwww.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_featured_16x9/public/cgov_image/media_image/900/800/files/nci-shady-grove-building-article.jpg?h=24088f54&itok=LjoM-x6W — 200 — 150.7 KiB — 60 ms — h2https://www.cancer.gov/sites/www/files/styles/ncids_featured_16x9/public/cgov_image/media_image/100/700/8/files/ncab-june-2015-article.jpg?h=f8a4c3d2&itok=czG8t4_kwww.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/ncids_featured_16x9/public/cgov_image/media_image/100/700/8/files/ncab-june-2015-article.jpg?h=f8a4c3d2&itok=czG8t4_k — 200 — 133.5 KiB — 73 ms — h2https://www.cancer.gov/sites/www/files/styles/video_display_ncids_inline/public/cgov_image/override_video_thumbnail/2024-08/CCDI-ImprovedDataSharing-HighResThumbnail.jpg?itok=6Vz87A35www.cancer.gov/sites/www/files/styl... https://www.cancer.gov/sites/www/files/styles/video_display_ncids_inline/public/cgov_image/override_video_thumbnail/2024-08/CCDI-ImprovedDataSharing-HighResThumbnail.jpg?itok=6Vz87A35 — 200 — 206.2 KiB — 132 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 — 14 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 — 10 ms — h3
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https://metrics.cancer.gov/b/ss/ncienterprise/1/JS-2.27.0-LGPQ/s87125622241569?AQB=1&pccr=true&vidn=34F3E8334895F034-60000E6A224A7D72&ndh=1&pf=1&t=21%2F3%2F2026%2019%3A30%3A46%202%200&fid=230E624C2ACBA4FB-24501F32402B2380&ce=UTF-8&ns=nci&pageName=www.cancer.gov%2F&g=https%3A%2F%2Fwww.cancer.gov%2F&cc=USD&ch=NCI%20Homepage&events=event1%2Cevent47%3D4&c1=https%3A%2F%2Fwww.cancer.gov%2F&v1=www.cancer.gov%2F&h1=www.cancer.gov&v2=D%3Dc8&c3=%2F&v5=Desktop&c6=Comprehensive%20Cancer%20Information&v7=D%3Dc7&c8=english&c10=Comprehensive%20Cancer%20Information%20-%20NCI&c25=1980-01-01&c26=2026%7C4%7C21%7C19&c29=year%3D2026%20%7C%20month%3DApril%20%7C%20date%3D21%20%7C%20day%3DTuesday%20%7C%20time%3D3%3A30%20PM&c44=NCI%20Homepage&v44=D%3Dc44&v59=launch_Digital%20Platform%3A%20CGov%3A%20EDDL-Enabled_www.cancer.gov&v61=cgvHomeLanding%7Cncids_without_title&v63=www-prod&c65=4&s=800x600&c=24&j=1.6&v=N&k=Y&bw=1350&bh=940&AQE=1 — 200 — 140 B — 129 ms — 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 — 5 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 — 21 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 — 26 ms — h3https://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 — 7 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 — 147.5 KiB — 366 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zd9131934939&_p=1776799847031&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1980031734.1776799847&frm=0&pscdl=noapi&rcb=8&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266400~117884344&dl=https%3A%2F%2Fcancer.gov%2F&dt=Comprehensive%20Cancer%20Information%20-%20NCI&dr=&sid=1776799847&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=2171www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zd9131934939&_p=1776799847031&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1980031734.1776799847&frm=0&pscdl=noapi&rcb=8&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266400~117884344&dl=https%3A%2F%2Fcancer.gov%2F&dt=Comprehensive%20Cancer%20Information%20-%20NCI&dr=&sid=1776799847&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=2171 — 204 — 549 B — 121 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 432ms · 260KB · $6/mo
www.cancer.gov
Other
Optional
Execution 139ms
Transfer 10 KB
Monthly Cost $2/mo
script.crazyegg.com
Other
Optional
Execution 86ms
Transfer 55 KB
Unused 52%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 82ms
Transfer 147 KB
Unused 41%
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 72ms
Transfer 0 KB
Monthly Cost $1/mo
assets.adobedtm.com
Other
Optional
Execution 53ms
Transfer 47 KB
Monthly Cost $1/mo

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

Why this matters

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

Learn more ▾

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

Source: web.dev

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

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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