Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

Best Practices

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

11.13 s

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

22.25 s

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

468 ms

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

0.000

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

11.13 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.

23.42 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

7 PASS 2 REVIEW 6 FIX

Page Weight Budget

Action

4.5 MB transferred, 145 requests

FIX

4.5 MB transferred, 145 requests

Page weighs 8.9 MB (4.5 MB transferred)

Images are 2.6 MB — compress or use modern formats

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

Got: 2.6 MB

JavaScript is 1.5 MB — consider code splitting or lazy loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Got: 1.5 MB

145 HTTP requests — consider bundling or reducing

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

Estimated 0.94 g CO2 per page load

4.5 MB transferred

145 requests

0.94 g CO2 per page load

Images 2.6 MiB 57%

JavaScript 1.5 MiB 33%

HTML 253.9 KiB 6%

Fonts 159.7 KiB 3%

CSS 43.7 KiB 1%

Other 16.1 KiB 0%

Other 12.9 KiB 0%

Other 691 B 0%

Other 588 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

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

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

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (4.5 MiB of 4.5 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

JS Execution Cost

Action

6127ms total JS execution

FIX

6127ms total JS execution

https://assets.edfcdn.org/assets/global/dist/js/ut...: 1505ms CPU time

Unattributable: 777ms CPU time

https://admin-pipeline.upsun-us-2.observability-pi...: 558ms CPU time

https://cdn.fundraiseup.com/widget/AQBHBSYR: 434ms CPU time

https://www.edf.org/: 401ms CPU time

Third-party scripts: 6127ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Style & Layout 19% Other 18% Script Parsing & Compilation 8%

Script	Total	Scripting	Parse/Compile	Party
https://assets.edfcdn.org/assets/global/dist/js/utilities.min.js?v=2026042207	1505ms	778ms	22ms	3rd
Unattributable	777ms	14ms	0ms	3rd
https://admin-pipeline.upsun-us-2.observability-pipeline.blackfire.io/js/probe.js	558ms	409ms	8ms	3rd
https://cdn.fundraiseup.com/widget/AQBHBSYR	434ms	182ms	24ms	3rd
https://www.edf.org/	401ms	22ms	6ms	3rd
https://www.edf.org/sites/default/files/js/js_t6Gpq-JUyC8ONfgYv1oJLR49qonCRRHWCnitPZfhV-Y.js?scope=footer&delta=0&language=en&theme=edf2020&include=eJxNy1sKgCAQRuENZYobiqH-UvGWMwa1-nqSHs8Hh5ghi88Bq5SmA8-CVNFIesNydv9M2HZrrNGuJKhKB5RDK4MjCVgUf7sHD2a54y-l1EzXC9gtJ3M	396ms	159ms	13ms	3rd
https://static.fundraiseup.com/donation-form.41b66f2219e57ec2.js	382ms	329ms	12ms	3rd
https://scripts.clarity.ms/0.8.59/clarity.js	255ms	235ms	6ms	3rd
https://static.fundraiseup.com/checkout-vendors.78ab7844d94042df.js	238ms	209ms	28ms	3rd
https://script.crazyegg.com/pages/versioned/common-scripts/d4db359b93044eca900e8363b7f9fd2e.js	233ms	203ms	12ms	3rd

Showing top 10 of 18 scripts

JS Bundles

Action

46 scripts, 747 KB unused

FIX

46 scripts, 747 KB unused

https://static.fundraiseup.com/checkout.621abe447e...: 366 KB unused (89%)

Consider code splitting or tree shaking to reduce unused code.

https://static.fundraiseup.com/checkout-sentry-ven...: 112 KB unused (100%)

Consider code splitting or tree shaking to reduce unused code.

https://static.fundraiseup.com/checkout-vendors.78...: 87 KB unused (83%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtag/js?id=DC-439...: 53 KB unused (41%)

Consider code splitting or tree shaking to reduce unused code.

https://admin-pipeline.upsun-us-2.observability-pi...: 31 KB unused (32%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 747 KB

747 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://static.fundraiseup.com/checkout.621abe447e62aa70.js	411 KB	366 KB (89%)	✓	3rd
https://static.fundraiseup.com/checkout-sentry-vendor.dda4c7629502a974.js	112 KB	112 KB (100%)	✓	3rd
https://static.fundraiseup.com/checkout-vendors.78ab7844d94042df.js	105 KB	87 KB (83%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=DC-4390944	131 KB	53 KB (41%)	✓	3rd
https://admin-pipeline.upsun-us-2.observability-pipeline.blackfire.io/js/probe.js	97 KB	31 KB (32%)	✓	3rd
https://assets.edfcdn.org/assets/global/dist/js/utilities.min.js?v=2026042207	85 KB	29 KB (34%)	✓	3rd
https://script.crazyegg.com/pages/versioned/common-scripts/d4db359b93044eca900e8363b7f9fd2e.js	56 KB	26 KB (47%)	✓	3rd
https://static.fundraiseup.com/checkout-styles.fab72e48733dfd10.js	23 KB	22 KB (100%)	✓	3rd
https://cdn.fundraiseup.com/widget/AQBHBSYR	65 KB	21 KB (33%)	✓	3rd
https://static.fundraiseup.com/embed-data/elements/XREWMKJU.js	2 KB	—	✓	3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Page Weight Inventory

Action

145 resources · 4.5 MB · 747 KB savings available

FIX

145 resources · 4.5 MB · 747 KB savings available

Page weight 3.5 MB over 1MB target

Got: 4.5 MB Expected: ≤ 1 MB

~747 KB of savings available

144 third-party resources (100% of weight)

4 resources over 200KB

145 resources · 4.5 MiB · 144 third-party 3.5 MiB over 1MB target

Image 57% · 2.6 MiB

JavaScript 33% · 1.5 MiB

Document 6% · 258.6 KiB

Font 3% · 159.7 KiB

CSS 1% · 43.7 KiB

Other 0% · 9.5 KiB

~747.0 KiB of savings available

Remove unused JavaScript: 747.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

145 resources			4.5 MiB

HTTP Caching

Action

No cache headers

FIX

No cache headers

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.

Image Optimization

62 images, 0 KB saveable

REVIEW

62 images, 0 KB saveable

https://www.edf.org/themes/edf2020/images/source/s... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

62 images 2.6 MB

0 oversized -0 KB

24 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

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

All text resources are properly compressed.

A+

Font Loading

8 fonts (160 KB)

PASS

8 fonts (160 KB)

8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

160 KB total

Render-blocking

of 8

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

jizDREVItHgc8qDIbSTKq4X... woff2 swap

Size 29 KB

Load time 37 ms

Start 1.2 s

Risk FOUT — text flashes from fallback to web font

l woff2 swap

Size 16 KB

Load time 57 ms

Start 1.2 s

Risk FOUT — text flashes from fallback to web font

ibmplexsans-v19-400.dc8... woff2 swap

Size 56 KB

Load time 90 ms

Start 2.0 s

Risk FOUT — text flashes from fallback to web font

ibmplexsans-v19-600.4b4... woff2 swap

Size 60 KB

Load time 92 ms

Start 2.0 s

Risk FOUT — text flashes from fallback to web font

ibmplexsans-v19-400.dc8... woff2 swap

Size 0 KB

Load time 90 ms

Start 2.0 s

Risk FOUT — text flashes from fallback to web font

ibmplexsans-v19-600.4b4... woff2 swap

Size 0 KB

Load time 92 ms

Start 2.0 s

Risk FOUT — text flashes from fallback to web font

ibmplexsans-v19-400.dc8... woff2 swap

Size 0 KB

Load time 90 ms

Start 2.0 s

Risk FOUT — text flashes from fallback to web font

ibmplexsans-v19-600.4b4... woff2 swap

Size 0 KB

Load time 91 ms

Start 2.0 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

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

4 hints, 0 missing preconnects

PASS

4 hints, 0 missing preconnects

Page uses 4 resource hint(s)

Current Resource Hints

preconnect

preload

—

dns-prefetch

prefetch

—

4 resource hints configured

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

Network Waterfall

145 requests over 5437ms

INFO

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 6127ms · 1548KB · €67/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
assets.edfcdn.org assets.edfcdn.org	Other	1505ms	85 KB	34%	€16/mo	Costly
Unattributable Unattributable	Other	777ms	0 KB	—	€8/mo	Costly
admin-pipeline.upsun-us-2.observability-pipeline.blackfire.io admin-pipeline.upsun-us-2.observability-pipeline.blackfire.io	Other	558ms	97 KB	32%	€6/mo	Costly
cdn.fundraiseup.com cdn.fundraiseup.com	Other	434ms	65 KB	33%	€5/mo	Costly
www.edf.org www.edf.org	Other	401ms	253 KB	—	€4/mo	Costly
www.edf.org www.edf.org	Other	396ms	29 KB	—	€4/mo	Costly
static.fundraiseup.com static.fundraiseup.com	Other	382ms	37 KB	—	€4/mo	Costly
Microsoft Clarity scripts.clarity.ms	Session Replay	255ms	26 KB	—	€3/mo	Costly
static.fundraiseup.com static.fundraiseup.com	Other	238ms	105 KB	83%	€3/mo	Costly
script.crazyegg.com script.crazyegg.com	Other	233ms	56 KB	47%	€3/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	229ms	131 KB	41%	€2/mo	Costly
static.fundraiseup.com static.fundraiseup.com	Other	187ms	4 KB	—	€2/mo	Optional
static.fundraiseup.com static.fundraiseup.com	Other	165ms	411 KB	89%	€2/mo	Optional
cdnjs cdnjs.cloudflare.com	CDN	88ms	28 KB	—	€1/mo	Optional
static.fundraiseup.com static.fundraiseup.com	Other	77ms	37 KB	—	€1/mo	Optional
static.fundraiseup.com static.fundraiseup.com	Other	74ms	140 KB	—	€1/mo	Optional
script.crazyegg.com script.crazyegg.com	Other	67ms	23 KB	—	€1/mo	Optional
static.fundraiseup.com static.fundraiseup.com	Other	61ms	21 KB	—	€1/mo	Optional

assets.edfcdn.org

Other

Costly

Execution 1505ms

Transfer 85 KB

Unused 34%

Monthly Cost €16/mo

Unattributable

Other

Costly

Execution 777ms

Transfer 0 KB

Monthly Cost €8/mo

admin-pipeline.upsun-us-2.observability-pipeline.blackfire.io

Other

Costly

Execution 558ms

Transfer 97 KB

Unused 32%

Monthly Cost €6/mo

cdn.fundraiseup.com

Other

Costly

Execution 434ms

Transfer 65 KB

Unused 33%

Monthly Cost €5/mo

www.edf.org

Other

Costly

Execution 401ms

Transfer 253 KB

Monthly Cost €4/mo

www.edf.org

Other

Costly

Execution 396ms

Transfer 29 KB

Monthly Cost €4/mo

static.fundraiseup.com

Other

Costly

Execution 382ms

Transfer 37 KB

Monthly Cost €4/mo

Microsoft Clarity

Session Replay

Costly

Execution 255ms

Transfer 26 KB

Monthly Cost €3/mo

static.fundraiseup.com

Other

Costly

Execution 238ms

Transfer 105 KB

Unused 83%

Monthly Cost €3/mo

script.crazyegg.com

Other

Costly

Execution 233ms

Transfer 56 KB

Unused 47%

Monthly Cost €3/mo

Google Tag Manager

Tag Manager

Costly

Execution 229ms

Transfer 131 KB

Unused 41%

Monthly Cost €2/mo

static.fundraiseup.com

Other

Optional

Execution 187ms

Transfer 4 KB

Monthly Cost €2/mo

static.fundraiseup.com

Other

Optional

Execution 165ms

Transfer 411 KB

Unused 89%

Monthly Cost €2/mo

cdnjs

CDN

Optional

Execution 88ms

Transfer 28 KB

Monthly Cost €1/mo

static.fundraiseup.com

Other

Optional

Execution 77ms

Transfer 37 KB

Monthly Cost €1/mo

static.fundraiseup.com

Other

Optional

Execution 74ms

Transfer 140 KB

Monthly Cost €1/mo

script.crazyegg.com

Other

Optional

Execution 67ms

Transfer 23 KB

Monthly Cost €1/mo

static.fundraiseup.com

Other

Optional

Execution 61ms

Transfer 21 KB

Monthly Cost €1/mo

These scripts may cost more than they're worth

assets.edfcdn.org adds 1505ms and costs ~€16/month
Unattributable adds 777ms and costs ~€8/month
admin-pipeline.upsun-us-2.observability-pipeline.blackfire.io adds 558ms and costs ~€6/month
cdn.fundraiseup.com adds 434ms and costs ~€5/month
www.edf.org adds 401ms and costs ~€4/month
www.edf.org adds 396ms and costs ~€4/month
static.fundraiseup.com adds 382ms and costs ~€4/month
Microsoft Clarity adds 255ms and costs ~€3/month
static.fundraiseup.com adds 238ms and costs ~€3/month
script.crazyegg.com adds 233ms and costs ~€3/month
Google Tag Manager adds 229ms 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

assets.edfcdn.org takes 1505ms 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 777ms 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

admin-pipeline.upsun-us-2.observability-pipeline.blackfire.io takes 558ms 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 434ms 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.edf.org takes 401ms 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.edf.org takes 396ms 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 382ms 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

Microsoft Clarity takes 255ms 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 238ms 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

script.crazyegg.com takes 233ms 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 229ms 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

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

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.