Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.29 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.73 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
60 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.015
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.42 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.
6.60 s
Page Load Progression
798 ms
1.6 s
2.4 s
3.2 s 4.0 s 4.8 s 5.6 s
6.4 sFPage Weight BudgetAction4.9 MB transferred, 226 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction123 scripts, 2.3 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://static.fundraiseup.com/checkout.9e2624d0be733d7f.js | 410 KB | 366 KB (89%) | ✓ | 3rd |
| https://static.fundraiseup.com/checkout.9e2624d0be733d7f.js | 0 KB | 366 KB (89%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 0 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 0 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 177 KB (49%) | ✓ | 3rd |
| https://static.fundraiseup.com/checkout-sentry-vendor.dda4c7629502a974.js | 112 KB | 112 KB (100%) | ✓ | 3rd |
| https://static.fundraiseup.com/checkout-sentry-vendor.dda4c7629502a974.js | 0 KB | 112 KB (100%) | ✓ | 3rd |
| https://static.fundraiseup.com/checkout-vendors.78ab7844d94042df.js | 105 KB | 87 KB (83%) | ✓ | 3rd |
| https://static.fundraiseup.com/checkout-vendors.78ab7844d94042df.js | 0 KB | 87 KB (83%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction226 resources · 4.9 MB · 2.3 MB savings availableFIX
~2.3 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 226 resources | 4.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction46 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CJS Execution CostAction1894ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 297ms | 2ms | 0ms | 3rd |
| https://www.si.edu/ | 279ms | 64ms | 10ms | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 195ms | 168ms | 21ms | 3rd |
| https://www.si.edu/cdn-cgi/challenge-platform/scripts/jsd/main.js | 148ms | 138ms | 2ms | 3rd |
| https://cdn.jsdelivr.net/npm/gsap@3.12.5/dist/ScrollTrigger.min.js | 140ms | 43ms | 0ms | 3rd |
| https://static.fundraiseup.com/checkout-vendors.78ab7844d94042df.js | 124ms | 109ms | 14ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TT2JWKJ | 114ms | 95ms | 15ms | 3rd |
| https://cdn.fundraiseup.com/widget/AVCYLAJJ | 105ms | 85ms | 11ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-ENWSWPLJYD&cx=c>m=4e64h1 | 85ms | 77ms | 8ms | 3rd |
| https://cdn.jsdelivr.net/npm/gsap@3.12.5/dist/gsap.min.js | 84ms | 9ms | 0ms | 3rd |
Showing top 10 of 15 scripts
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading12 fonts (292 KB)PASS
Web fonts
12
292 KB total
Render-blocking
0
of 12
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall226 requests over 4127msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 297ms | 0 KB | — | $4/mo | Costly |
www.si.edu www.si.edu | Other | 279ms | 0 KB | — | $4/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 195ms | 0 KB | 49% | $3/mo | Optional |
www.si.edu www.si.edu | Other | 148ms | 0 KB | — | $2/mo | Optional |
jsDelivr cdn.jsdelivr.net | CDN | 140ms | 18 KB | — | $2/mo | Optional |
static.fundraiseup.com static.fundraiseup.com | Other | 124ms | 0 KB | 83% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 114ms | 171 KB | 35% | $2/mo | Optional |
cdn.fundraiseup.com cdn.fundraiseup.com | Other | 105ms | 1 KB | 33% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 85ms | 147 KB | 42% | $1/mo | Optional |
jsDelivr cdn.jsdelivr.net | CDN | 84ms | 29 KB | — | $1/mo | Optional |
static.fundraiseup.com static.fundraiseup.com | Other | 78ms | 0 KB | 89% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 67ms | 145 KB | 43% | $1/mo | Optional |
www.si.edu www.si.edu | Other | 66ms | 0 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 61ms | 144 KB | 43% | $1/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 52ms | 26 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 297ms and costs ~$4/month
- www.si.edu adds 279ms and costs ~$4/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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
Unattributable takes 297ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.si.edu takes 279ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
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.
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.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev