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https://cancer.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
40
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

3.56 s

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

11.43 s

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

1.52 s

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

0.011

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

4.26 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.

24.78 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 2 REVIEW 6 FIX
F
Page Weight Budget
Action
4.0 MB transferred, 94 requests
FIX
4.0 MB transferred, 94 requests
Critical::
Page weighs 11.1 MB (4.0 MB transferred)
Warning::
JavaScript is 1.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.9 MB
Info::
Fonts are 1.2 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.2 MB
Info::
CSS is 290 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 290 KB
Info::
94 HTTP requests
Info::
Estimated 0.83 g CO2 per page load
4.0 MB / 2.4 MB budget
4.0 MB transferred
94 requests
0.83 g CO2 per page load
JavaScript 1.9 MiB 49%
Fonts 1.2 MiB 31%
Images 332.3 KiB 8%
CSS 290.3 KiB 7%
Other 135.6 KiB 3%
HTML 71.9 KiB 2%
Other 3.0 KiB 0%
Other 835 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (4.0 MiB of 4.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5771ms total JS execution
FIX
5771ms total JS execution
Warning::
https://www.cancer.org/: 1481ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 858ms CPU time
Warning::
Unattributable: 591ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-52Z...: 590ms CPU time
Warning::
https://www.cancer.org/etc.clientlibs/clientlibs/g...: 514ms CPU time
Warning::
Third-party scripts: 5771ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Style & Layout 16% Other 13% Script Parsing & Compilation 8% Parse HTML & CSS 6% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.cancer.org/1481ms32ms6ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js858ms748ms83ms3rd
Unattributable591ms18ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-52Z3PC590ms452ms74ms3rd
https://www.cancer.org/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.js514ms371ms8ms3rd
https://www.cancer.org/etc.clientlibs/acs/clientlibs/clientlib-site.lc-1776150525909-lc.min.js469ms382ms30ms3rd
https://assets-donate.azureedge.net/widget/donate-view.js351ms222ms129ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-54NVNBW3269ms193ms74ms3rd
https://www.googletagmanager.com/gtag/js?id=GT-PZQ945RS&cx=c&gtm=4e64h1262ms218ms42ms3rd
https://www.cancer.org/etc.clientlibs/acs/clientlibs/clientlib-site-dependencies.lc-561576a39ac3ac114412656939ca1642-lc.min.js182ms158ms5ms3rd

Showing top 10 of 12 scripts

F
JS Bundles
Action
30 scripts, 1.1 MB unused
FIX
30 scripts, 1.1 MB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets-donate.azureedge.net/widget/donate-...: 149 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.1 MB
1166 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://assets-donate.azureedge.net/widget/donate-view.js429 KB149 KB (35%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-54NVNBW3157 KB84 KB (53%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-52Z3PC195 KB73 KB (37%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-PZQ945RS&cx=c&gtm=4e64h1152 KB71 KB (47%)✓3rd
https://www.cancer.org/etc.clientlibs/acs/clientlibs/clientlib-site.lc-1776150525909-lc.min.js102 KB54 KB (53%)✓3rd
https://acs.cdn-v3.conductrics.com/ac-wwCNWYiyTq/v3/agent-api/js/f-fgEHefvxuQ/dt-sMIQILzQvxMl05SVGCS1PIqjDdlOtd?apikey=api-oDWwtQPqSBWiSdHSxXCm54 KB29 KB (55%)✓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
Page Weight Inventory
Action
94 resources · 4.0 MB · 1.1 MB savings available
FIX
94 resources · 4.0 MB · 1.1 MB savings available
Warning::
Page weight 3.0 MB over 1MB target
Got: 4.0 MB Expected: ≤ 1 MB
Info::
~1.1 MB of savings available
Warning::
93 third-party resources (100% of weight)
Info::
5 resources over 200KB
94 resources · 4.0 MiB · 93 third-party 3.0 MiB over 1MB target
JavaScript 49% · 1.9 MiB
Font 31% · 1.2 MiB
Image 12% · 467.4 KiB
CSS 7% · 290.3 KiB
Document 2% · 72.3 KiB
Other 0% · 3.8 KiB

~1.1 MiB of savings available

Remove unused JavaScript: 1.1 MiB
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
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Info::
All images are well-optimized
20 images 332 KB
0 oversized -0 KB
9 legacy format
0 missing dimensions CLS risk
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
17 fonts (1244 KB)
PASS
17 fonts (1244 KB)
Info::
17 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

17

1244 KB total

Render-blocking

0

of 17

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.6 s LCP 11.4 shttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 25 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLCz7Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 7.7 KiB — 26 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2 — 14.4 KiB — 36 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiDyp8kv8JHgFVrJJLmy15VF9eOYktMqg.woff2pxiDyp8kv8JHgFVrJJLmy15... https://fonts.gstatic.com/s/poppins/v24/pxiDyp8kv8JHgFVrJJLmy15VF9eOYktMqg.woff2 — 8.5 KiB — 30 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 28 ms — font-display: swaphttps://fonts.gstatic.com/s/sourceserifpro/v18/neIXzD-0qpwxpaWvjeD0X88SAOeasc8btSyqxKcsdrM.woff2neIXzD-0qpwxpaWvjeD0X88... https://fonts.gstatic.com/s/sourceserifpro/v18/neIXzD-0qpwxpaWvjeD0X88SAOeasc8btSyqxKcsdrM.woff2 — 21.1 KiB — 46 ms — font-display: swaphttps://fonts.gstatic.com/s/sourceserifpro/v18/neIQzD-0qpwxpaWvjeD0X88SAOeauXQ-oAGIyY0.woff2neIQzD-0qpwxpaWvjeD0X88... https://fonts.gstatic.com/s/sourceserifpro/v18/neIQzD-0qpwxpaWvjeD0X88SAOeauXQ-oAGIyY0.woff2 — 20.0 KiB — 45 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiGyp8kv8JHgFVrJJLucHtAOvWDSA.woff2pxiGyp8kv8JHgFVrJJLucHt... https://fonts.gstatic.com/s/poppins/v24/pxiGyp8kv8JHgFVrJJLucHtAOvWDSA.woff2 — 8.5 KiB — 43 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK1dSBYKcSV-LCoeQqfX1RYOo3qPZ7nsDJB9cme.woff26xK1dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK1dSBYKcSV-LCoeQqfX1RYOo3qPZ7nsDJB9cme.woff2 — 13.9 KiB — 25 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/webfonts/fa-brands-400.woff2 — 106.1 KiB — 60 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/webfonts/fa-regular-400.woff2 — 25.0 KiB — 63 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/webfonts/fa-solid-900.woff2 — 147.2 KiB — 85 ms — font-display: swaphttps://www.cancer.org/etc.clientlibs/acs/clientlibs/clientlib-fontawesome/resources/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.cancer.org/etc.clientlibs/acs/clientlibs/clientlib-fontawesome/resources/webfonts/fa-brands-400.woff2 — 108.6 KiB — 11 ms — font-display: swaphttps://www.cancer.org/etc.clientlibs/acs/clientlibs/clientlib-fontawesome/resources/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.cancer.org/etc.clientlibs/acs/clientlibs/clientlib-fontawesome/resources/webfonts/fa-solid-900.woff2 — 320.5 KiB — 19 ms — font-display: swaphttps://www.cancer.org/etc.clientlibs/acs/clientlibs/clientlib-fontawesome/resources/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.cancer.org/etc.clientlibs/acs/clientlibs/clientlib-fontawesome/resources/webfonts/fa-regular-400.woff2 — 386.6 KiB — 24 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 65 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 0 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 25 ms
Start 614 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x... woff2 swap
Size 8 KB
Load time 26 ms
Start 657 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 36 ms
Start 658 ms
Risk FOUT — text flashes from fallback to web font
pxiDyp8kv8JHgFVrJJLmy15... woff2 swap
Size 8 KB
Load time 30 ms
Start 658 ms
Risk FOUT — text flashes from fallback to web font
pxiEyp8kv8JHgFVrJJfecnF... woff2 swap
Size 8 KB
Load time 28 ms
Start 703 ms
Risk FOUT — text flashes from fallback to web font
neIXzD-0qpwxpaWvjeD0X88... woff2 swap
Size 21 KB
Load time 46 ms
Start 704 ms
Risk FOUT — text flashes from fallback to web font
neIQzD-0qpwxpaWvjeD0X88... woff2 swap
Size 20 KB
Load time 45 ms
Start 704 ms
Risk FOUT — text flashes from fallback to web font
pxiGyp8kv8JHgFVrJJLucHt... woff2 swap
Size 8 KB
Load time 43 ms
Start 704 ms
Risk FOUT — text flashes from fallback to web font
6xK1dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 25 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 106 KB
Load time 60 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-regular-400.woff2 woff2 swap
Size 25 KB
Load time 63 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 147 KB
Load time 85 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-brands-400.woff2 woff2 swap
Size 109 KB
Load time 11 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-solid-900.woff2 woff2 swap
Size 320 KB
Load time 19 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-regular-400.woff2 woff2 swap
Size 387 KB
Load time 24 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 65 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.7 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)

Fixing the unchecked items could save ~535 KB and ~1070 ms

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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 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
94 requests over 3976ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.6 s LCP 11.4 shttps://cancer.org// https://cancer.org/ — 301 — 502 B — 409 ms — http/1.1https://www.cancer.org/www.cancer.org/ https://www.cancer.org/ — 200 — 41.9 KiB — 16 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 98 ms — https://www.cancer.org/.rum/@adobe/helix-rum-js@%5E2/dist/micro.jswww.cancer.org/.rum/@adobe/helix-ru... https://www.cancer.org/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js — 200 — 1.1 KiB — 60 ms — h2https://fonts.googleapis.com/css2?family=Source+Serif+Pro:ital,wght@0,400;0,600;0,700;1,400;1,600;1,700&display=swapfonts.googleapis.com/css2?family=So... https://fonts.googleapis.com/css2?family=Source+Serif+Pro:ital,wght@0,400;0,600;0,700;1,400;1,600;1,700&display=swap — 200 — 1.0 KiB — 84 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
100% of JavaScript execution is third-party
First-party Third-party 5771ms · 1209KB · $41/mo
www.cancer.org
Other
Costly
Execution 1481ms
Transfer 42 KB
Monthly Cost $10/mo
www.gstatic.com
Other
Costly
Execution 858ms
Transfer 0 KB
Unused 49%
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 591ms
Transfer 0 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 590ms
Transfer 195 KB
Unused 37%
Monthly Cost $4/mo
www.cancer.org
Other
Costly
Execution 514ms
Transfer 35 KB
Monthly Cost $4/mo
www.cancer.org
Other
Costly
Execution 469ms
Transfer 102 KB
Unused 53%
Monthly Cost $3/mo
assets-donate.azureedge.net
Other
Costly
Execution 351ms
Transfer 429 KB
Unused 35%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 269ms
Transfer 157 KB
Unused 53%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 262ms
Transfer 152 KB
Unused 47%
Monthly Cost $2/mo
www.cancer.org
Other
Optional
Execution 182ms
Transfer 20 KB
Monthly Cost $1/mo
acs.cdn-v3.conductrics.com
Other
Optional
Execution 106ms
Transfer 54 KB
Unused 55%
Monthly Cost $1/mo
www.cancer.org
Other
Optional
Execution 97ms
Transfer 21 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.cancer.org adds 1481ms and costs ~$10/month
  • www.gstatic.com adds 858ms and costs ~$6/month
  • Unattributable adds 591ms and costs ~$4/month
  • Google Tag Manager adds 590ms and costs ~$4/month
  • www.cancer.org adds 514ms and costs ~$4/month
  • www.cancer.org adds 469ms and costs ~$3/month
  • assets-donate.azureedge.net adds 351ms and costs ~$2/month
  • Google Tag Manager adds 269ms and costs ~$2/month
  • Google Tag Manager adds 262ms and costs ~$2/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

www.cancer.org takes 1481ms 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

www.gstatic.com takes 858ms 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 591ms 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 590ms 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

www.cancer.org takes 514ms 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

www.cancer.org takes 469ms 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

53% of www.cancer.org'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

assets-donate.azureedge.net takes 351ms 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 269ms 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

53% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

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

Source: web.dev

Google Tag Manager takes 262ms 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

55% of acs.cdn-v3.conductrics.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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