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https://heart.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
4
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.
77
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.

4.93 s

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

31.34 s

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

3.82 s

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

0.931

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

7.95 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.

32.37 s

Page Load Progression

521 ms
1.0 s
1.6 s
2.1 s
2.6 s
3.1 s
3.6 s
4.2 s
Checks
17
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 132 requests
FIX
4.7 MB transferred, 132 requests
Critical::
Page weighs 17.0 MB (4.7 MB transferred)
Warning::
JavaScript is 3.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.8 MB
Info::
CSS is 371 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 371 KB
Warning::
132 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.99 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
132 requests
0.99 g CO2 per page load
JavaScript 3.8 MiB 80%
Images 476.0 KiB 10%
CSS 370.9 KiB 8%
Other 66.9 KiB 1%
Fonts 38.1 KiB 1%
HTML 30.3 KiB 1%
Other 3.8 KiB 0%
Other 1.2 KiB 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

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (4.7 MiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
9402ms total JS execution
FIX
9402ms total JS execution
Warning::
https://www.heart.org/dist/common/app.bundle.js?v=...: 1770ms CPU time
Warning::
https://www.heart.org/: 1499ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5F7...: 801ms CPU time
Warning::
Unattributable: 754ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PRL...: 547ms CPU time
Warning::
Third-party scripts: 9402ms (100% of total)

Main Thread Breakdown

Script Evaluation 56% Other 15% Script Parsing & Compilation 14% Style & Layout 7% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.heart.org/dist/common/app.bundle.js?v=1.28.2.258921770ms1298ms215ms3rd
https://www.heart.org/1499ms32ms5ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5F7TTVL&gtm=4e64h1801ms720ms65ms3rd
Unattributable754ms29ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PRLD9XQ547ms452ms68ms3rd
https://static.fundraiseup.com/7449.d9966e86b20cdf9f.js423ms355ms2ms3rd
https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js380ms211ms42ms3rd
https://cdn.optimizely.com/js/25670000279.js340ms275ms27ms3rd
https://cdn.fundraiseup.com/widget/ARMPCVPV289ms221ms23ms3rd
https://www.heart.org/dist/common/vendor.bundle.js?v=1.28.2.25892288ms16ms260ms3rd

Showing top 10 of 26 scripts

F
JS Bundles
Action
61 scripts, 2.1 MB unused
FIX
61 scripts, 2.1 MB unused
Warning::
https://www.heart.org/dist/common/app.bundle.js?v=...: 443 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.fundraiseup.com/checkout.9e2624d0be...: 366 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.heart.org/dist/common/vendor.bundle.js...: 332 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.fundraiseup.com/checkout-sentry-ven...: 112 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.cloud.coveo.com/searchui/v2.10116/j...: 104 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.1 MB
2159 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.heart.org/dist/common/app.bundle.js?v=1.28.2.25892585 KB443 KB (76%)✓3rd
https://static.fundraiseup.com/checkout.9e2624d0be733d7f.js410 KB366 KB (89%)✓3rd
https://www.heart.org/dist/common/vendor.bundle.js?v=1.28.2.25892484 KB332 KB (71%)✓3rd
https://static.fundraiseup.com/checkout-sentry-vendor.dda4c7629502a974.js112 KB112 KB (100%)✓3rd
https://static.cloud.coveo.com/searchui/v2.10116/js/CoveoJsSearch.Lazy.min.js211 KB104 KB (51%)✓3rd
https://static.fundraiseup.com/checkout-vendors.78ab7844d94042df.js105 KB87 KB (83%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-JXBJ0MK9EJ&cx=c&gtm=4e64h1168 KB77 KB (46%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5F7TTVL&gtm=4e64h1190 KB72 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-12551341-7116 KB72 KB (62%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PRLD9XQ187 KB71 KB (38%)✓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
132 resources · 4.7 MB · 2.1 MB savings available
FIX
132 resources · 4.7 MB · 2.1 MB savings available
Warning::
Page weight 3.7 MB over 1MB target
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~2.1 MB of savings available
Warning::
131 third-party resources (100% of weight)
Info::
5 resources over 200KB
132 resources · 4.7 MiB · 131 third-party 3.7 MiB over 1MB target
JavaScript 80% · 3.8 MiB
Image 10% · 477.4 KiB
CSS 8% · 375.6 KiB
Other 1% · 65.7 KiB
Font 1% · 38.1 KiB
Document 1% · 30.4 KiB

~2.1 MiB of savings available

Remove unused JavaScript: 2.1 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.

C
Image Optimization
Action
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Warning::
https://www.heart.org/-/media/Project/Common/glyph... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.heart.org/-/media/Project/Common/Label... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
33 images 476 KB
0 oversized -0 KB
33 legacy format
2 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

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
2 fonts (38 KB)
PASS
2 fonts (38 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

38 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s FCP 4.9 s LCP 31.3 shttps://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2JTUSjIg1_i6t8kCHKm459Wl... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2 — 34.7 KiB — 42 ms — font-display: swaphttps://www.heart.org/dist/common/assets/fonts/aha-icon-font.ttfaha-icon-font.ttf https://www.heart.org/dist/common/assets/fonts/aha-icon-font.ttf — 3.4 KiB — 31 ms — font-display: swap
JTUSjIg1_i6t8kCHKm459Wl... woff2 swap
Size 35 KB
Load time 42 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
aha-icon-font.ttf ttf swap
Size 3 KB
Load time 31 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~1 KB and ~2 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
3
preload
2
dns-prefetch
1
prefetch
—

6 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
132 requests over 4200ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s FCP 4.9 s LCP 31.3 shttps://heart.org// https://heart.org/ — 301 — 118 B — 63 ms — h2https://www.heart.org/www.heart.org/ https://www.heart.org/ — 200 — 28.4 KiB — 740 ms — h2https://cdn.optimizely.com/js/25670000279.jscdn.optimizely.com/js/25670000279.j... https://cdn.optimizely.com/js/25670000279.js — 200 — 103.4 KiB — 93 ms — h2https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;500;600;700&display=swapfonts.googleapis.com/css2?family=Mo... https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;500;600;700&display=swap — 200 — 1.1 KiB — 86 ms — h2https://cdn.jsdelivr.net/npm/bootstrap-icons@1.10.5/font/bootstrap-icons.csscdn.jsdelivr.net/npm/bootstrap-icon... https://cdn.jsdelivr.net/npm/bootstrap-icons@1.10.5/font/bootstrap-icons.css — 200 — 13.0 KiB — 34 ms — h2https://www.heart.org/dist/common/vendor.css?v=1.28.2.25892www.heart.org/dist/common/vendor.cs... https://www.heart.org/dist/common/vendor.css?v=1.28.2.25892 — 200 — 2.3 KiB — 52 ms — h2https://www.heart.org/dist/common/app.css?v=1.28.2.25892www.heart.org/dist/common/app.css?v... https://www.heart.org/dist/common/app.css?v=1.28.2.25892 — 200 — 296.9 KiB — 70 ms — h2https://www.heart.org/layouts/system/VisitorIdentification.jswww.heart.org/layouts/system/Visito... https://www.heart.org/layouts/system/VisitorIdentification.js — 200 — 1.3 KiB — 63 ms — h2https://static.heart.org/ahaanywhere/sitecore/global/css/global.css?v=1.28.2.25892static.heart.org/ahaanywhere/siteco... https://static.heart.org/ahaanywhere/sitecore/global/css/global.css?v=1.28.2.25892 — 200 — 1.9 KiB — 133 ms — http/1.1https://www.heart.org/-/media/Images/Logos/Global-Do-No-Edit/Header/AHA_Full.svg?h=256&w=426&sc_lang=en&hash=202AEDB1D591881EC5D56074FDC541A3www.heart.org/-/media/Images/Logos/... https://www.heart.org/-/media/Images/Logos/Global-Do-No-Edit/Header/AHA_Full.svg?h=256&w=426&sc_lang=en&hash=202AEDB1D591881EC5D56074FDC541A3 — 200 — 8.5 KiB — 66 ms — h2https://www.heart.org/-/media/Images/Logos/Global-Do-No-Edit/Header/AHA_icon.svg?h=90&w=70&sc_lang=en&hash=77591B08CFB60097E13610EC8BB886B6www.heart.org/-/media/Images/Logos/... https://www.heart.org/-/media/Images/Logos/Global-Do-No-Edit/Header/AHA_icon.svg?h=90&w=70&sc_lang=en&hash=77591B08CFB60097E13610EC8BB886B6 — 200 — 3.8 KiB — 66 ms — h2https://www.heart.org/-/media/Project/Common/glyphs/search.svg?h=24&w=24&sc_lang=en&hash=D08FBCC52BBF0949A352C134D3C04658www.heart.org/-/media/Project/Commo... https://www.heart.org/-/media/Project/Common/glyphs/search.svg?h=24&w=24&sc_lang=en&hash=D08FBCC52BBF0949A352C134D3C04658 — 200 — 766 B — 34 ms — h3https://www.heart.org/-/media/Images/Multi-Flex-Card-Icons/cpr_white_sv.svg?h=136&w=102&sc_lang=en&hash=9B02D7D2DA230F814D32B1E1FBA6E4FBwww.heart.org/-/media/Images/Multi-... https://www.heart.org/-/media/Images/Multi-Flex-Card-Icons/cpr_white_sv.svg?h=136&w=102&sc_lang=en&hash=9B02D7D2DA230F814D32B1E1FBA6E4FB — 200 — 5.4 KiB — 40 ms — h3https://www.heart.org/-/media/Images/Multi-Flex-Card-Icons/white_heart_small_22.png?h=29&w=22&sc_lang=en&hash=FBB545C1CB11467110DF63B6E72A4C50www.heart.org/-/media/Images/Multi-... https://www.heart.org/-/media/Images/Multi-Flex-Card-Icons/white_heart_small_22.png?h=29&w=22&sc_lang=en&hash=FBB545C1CB11467110DF63B6E72A4C50 — 200 — 715 B — 26 ms — h3https://www.heart.org/dist/common/vendor.bundle.js?v=1.28.2.25892www.heart.org/dist/common/vendor.bu... https://www.heart.org/dist/common/vendor.bundle.js?v=1.28.2.25892 — 200 — 484.4 KiB — 129 ms — h3https://www.heart.org/dist/common/app.bundle.js?v=1.28.2.25892www.heart.org/dist/common/app.bundl... https://www.heart.org/dist/common/app.bundle.js?v=1.28.2.25892 — 200 — 585.4 KiB — 189 ms — h3https://www.heart.org/Coveo/Atomic/js/custom/Events.jswww.heart.org/Coveo/Atomic/js/custo... https://www.heart.org/Coveo/Atomic/js/custom/Events.js — 200 — 879 B — 158 ms — h3https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/jquery-3.6.3.min.jswww.heart.org/sitecore%20modules/We... https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/jquery-3.6.3.min.js — 200 — 39.5 KiB — 191 ms — h3https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/jquery.validate.min.jswww.heart.org/sitecore%20modules/We... https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/jquery.validate.min.js — 200 — 10.2 KiB — 203 ms — h3https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/jquery.validate.unobtrusive.min.jswww.heart.org/sitecore%20modules/We... https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/jquery.validate.unobtrusive.min.js — 200 — 3.0 KiB — 203 ms — h3https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/jquery.unobtrusive-ajax.min.jswww.heart.org/sitecore%20modules/We... https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/jquery.unobtrusive-ajax.min.js — 200 — 2.5 KiB — 203 ms — h3https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/form.init.jswww.heart.org/sitecore%20modules/We... https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/form.init.js — 200 — 1.0 KiB — 203 ms — h3https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/form.validate.jswww.heart.org/sitecore%20modules/We... https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/form.validate.js — 200 — 1.8 KiB — 205 ms — h3https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/form.tracking.jswww.heart.org/sitecore%20modules/We... https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/form.tracking.js — 200 — 3.1 KiB — 205 ms — h3https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/form.conditions.jswww.heart.org/sitecore%20modules/We... https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/form.conditions.js — 200 — 5.7 KiB — 206 ms — h3https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/formsextensions.validate.jswww.heart.org/sitecore%20modules/We... https://www.heart.org/sitecore%20modules/Web/ExperienceForms/scripts/formsextensions.validate.js — 200 — 1.7 KiB — 207 ms — h3https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/js/bootstrap.bundle.min.jscdn.jsdelivr.net/npm/bootstrap@4.6.... https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/js/bootstrap.bundle.min.js — 200 — 22.3 KiB — 11 ms — h2https://static.cloud.coveo.com/searchui/v2.10116/css/CoveoFullSearch.cssstatic.cloud.coveo.com/searchui/v2.... https://static.cloud.coveo.com/searchui/v2.10116/css/CoveoFullSearch.css — 200 — 54.0 KiB — 78 ms — h2https://static.cloud.coveo.com/coveoforsitecore/ui/v0.64.7/css/CoveoForSitecore.cssstatic.cloud.coveo.com/coveoforsite... https://static.cloud.coveo.com/coveoforsitecore/ui/v0.64.7/css/CoveoForSitecore.css — 200 — 1.5 KiB — 75 ms — h2https://static.cloud.coveo.com/searchui/v2.10116/js/CoveoJsSearch.Lazy.min.jsstatic.cloud.coveo.com/searchui/v2.... https://static.cloud.coveo.com/searchui/v2.10116/js/CoveoJsSearch.Lazy.min.js — 200 — 211.1 KiB — 112 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s FCP 4.9 s LCP 31.3 shttps://heart.org// https://heart.org/ — 301 — 118 B — 63 ms — h2https://www.heart.org/www.heart.org/ https://www.heart.org/ — 200 — 28.4 KiB — 740 ms — h2https://cdn.optimizely.com/js/25670000279.jscdn.optimizely.com/js/25670000279.j... https://cdn.optimizely.com/js/25670000279.js — 200 — 103.4 KiB — 93 ms — h2https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;500;600;700&display=swapfonts.googleapis.com/css2?family=Mo... https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;500;600;700&display=swap — 200 — 1.1 KiB — 86 ms — h2https://cdn.jsdelivr.net/npm/bootstrap-icons@1.10.5/font/bootstrap-icons.csscdn.jsdelivr.net/npm/bootstrap-icon... https://cdn.jsdelivr.net/npm/bootstrap-icons@1.10.5/font/bootstrap-icons.css — 200 — 13.0 KiB — 34 ms — 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h2https://cdn.cookielaw.org/logos/fa472ff4-417c-4667-a4ef-6c5a9434734a/01a72b42-3083-411c-b05b-4316d5de488b/297c1f9a-b7de-41ff-a5a0-15e2444ef89f/AHA_LOGO-HEX_Red+Black_LG.jpgcdn.cookielaw.org/logos/fa472ff4-41... https://cdn.cookielaw.org/logos/fa472ff4-417c-4667-a4ef-6c5a9434734a/01a72b42-3083-411c-b05b-4316d5de488b/297c1f9a-b7de-41ff-a5a0-15e2444ef89f/AHA_LOGO-HEX_Red+Black_LG.jpg — 200 — 96.5 KiB — 34 ms — h2https://cdn.cookielaw.org/logos/static/powered_by_logo.svgcdn.cookielaw.org/logos/static/powe... https://cdn.cookielaw.org/logos/static/powered_by_logo.svg — 200 — 2.5 KiB — 28 ms — h2https://js.adsrvr.org/universal_pixel.jsjs.adsrvr.org/universal_pixel.js https://js.adsrvr.org/universal_pixel.js — 200 — 935 B — 56 ms — http/1.1https://insight.adsrvr.org/track/realtimeconversioninsight.adsrvr.org/track/realtimeco... https://insight.adsrvr.org/track/realtimeconversion — 200 — 0 B — 109 ms — h2https://insight.adsrvr.org/track/realtimeconversioninsight.adsrvr.org/track/realtimeco... https://insight.adsrvr.org/track/realtimeconversion — 200 — 349 B — 110 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 9402ms · 3594KB · €163/mo
www.heart.org
Other
Costly
Execution 1770ms
Transfer 585 KB
Unused 76%
Monthly Cost €31/mo
www.heart.org
Other
Costly
Execution 1499ms
Transfer 28 KB
Monthly Cost €26/mo
Google Tag Manager
Tag Manager
Costly
Execution 801ms
Transfer 190 KB
Unused 38%
Monthly Cost €14/mo
Unattributable
Other
Costly
Execution 754ms
Transfer 0 KB
Monthly Cost €13/mo
Google Tag Manager
Tag Manager
Costly
Execution 547ms
Transfer 187 KB
Unused 38%
Monthly Cost €9/mo
static.fundraiseup.com
Other
Costly
Execution 423ms
Transfer 7 KB
Monthly Cost €7/mo
OneTrust
Consent
Essential
Execution 380ms
Transfer 128 KB
Unused 53%
Monthly Cost €7/mo
Optimizely
A/B Testing
Costly
Execution 340ms
Transfer 103 KB
Unused 41%
Monthly Cost €6/mo
cdn.fundraiseup.com
Other
Costly
Execution 289ms
Transfer 76 KB
Unused 30%
Monthly Cost €5/mo
www.heart.org
Other
Costly
Execution 288ms
Transfer 484 KB
Unused 71%
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 259ms
Transfer 145 KB
Unused 43%
Monthly Cost €5/mo
static.fundraiseup.com
Other
Costly
Execution 259ms
Transfer 105 KB
Unused 83%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 245ms
Transfer 168 KB
Unused 46%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 206ms
Transfer 129 KB
Unused 47%
Monthly Cost €4/mo
static.cloud.coveo.com
Other
Optional
Execution 199ms
Transfer 211 KB
Unused 51%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 194ms
Transfer 129 KB
Unused 48%
Monthly Cost €3/mo
static.fundraiseup.com
Other
Optional
Execution 164ms
Transfer 410 KB
Unused 89%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 159ms
Transfer 129 KB
Unused 48%
Monthly Cost €3/mo
static.cloud.coveo.com
Other
Optional
Execution 97ms
Transfer 22 KB
Monthly Cost €2/mo
static.cloud.coveo.com
Other
Optional
Execution 93ms
Transfer 12 KB
Monthly Cost €2/mo
OneTrust
Consent
Essential
Execution 80ms
Transfer 9 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 78ms
Transfer 116 KB
Unused 62%
Monthly Cost €1/mo
static.cloud.coveo.com
Other
Optional
Execution 77ms
Transfer 1 KB
Monthly Cost €1/mo
static.fundraiseup.com
Other
Optional
Execution 71ms
Transfer 140 KB
Monthly Cost €1/mo
www.heart.org
Other
Optional
Execution 71ms
Transfer 39 KB
Unused 55%
Monthly Cost €1/mo
static.fundraiseup.com
Other
Optional
Execution 58ms
Transfer 37 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.heart.org adds 1770ms and costs ~€31/month
  • www.heart.org adds 1499ms and costs ~€26/month
  • Google Tag Manager adds 801ms and costs ~€14/month
  • Unattributable adds 754ms and costs ~€13/month
  • Google Tag Manager adds 547ms and costs ~€9/month
  • static.fundraiseup.com adds 423ms and costs ~€7/month
  • Optimizely adds 340ms and costs ~€6/month
  • cdn.fundraiseup.com adds 289ms and costs ~€5/month
  • www.heart.org adds 288ms and costs ~€5/month
  • Google Tag Manager adds 259ms and costs ~€5/month
  • static.fundraiseup.com adds 259ms and costs ~€4/month
  • Google Tag Manager adds 245ms and costs ~€4/month
  • Google Tag Manager adds 206ms and costs ~€4/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.heart.org takes 1770ms 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

76% of www.heart.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

www.heart.org takes 1499ms 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 801ms 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 754ms 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 547ms 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

static.fundraiseup.com takes 423ms 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 OneTrust'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

Optimizely takes 340ms 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

cdn.fundraiseup.com takes 289ms 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.heart.org takes 288ms 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

71% of www.heart.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

Google Tag Manager takes 259ms 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

static.fundraiseup.com takes 259ms 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

83% of static.fundraiseup.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

Google Tag Manager takes 245ms 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 206ms 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

51% of static.cloud.coveo.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

89% of static.fundraiseup.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

62% 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

55% of www.heart.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

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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