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.
1.10 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
9.24 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
96 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.138
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.09 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.
9.34 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 sFPage Weight BudgetAction9.1 MB transferred, 170 requestsFIX
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
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
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 BundlesAction71 scripts, 1.4 MB unusedFIX
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://www.arthritis.org/bundles/arthritis?v=CXl2_lVGnGaHPxSQ1KqbRMzFm2XiO6cAHktounrY3Vw1 | 155 KB | 114 KB (74%) | ✓ | 3rd |
| https://static.fundraiseup.com/checkout-sentry-vendor.dda4c7629502a974.js | 112 KB | 112 KB (100%) | ✓ | 3rd |
| https://widget.instabot.io/jsapi/rokoInstabot.js | 222 KB | 100 KB (45%) | ✓ | 3rd |
| https://static.fundraiseup.com/checkout-vendors.78ab7844d94042df.js | 105 KB | 87 KB (83%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-ZLEF548DVM&cx=c>m=4e64k1h2 | 170 KB | 66 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-T7NLVT98E8&cx=c>m=4e64k1h2 | 157 KB | 66 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-12914008&cx=c>m=4e64k1h2 | 129 KB | 63 KB (48%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-936138255&cx=c>m=4e64k1h2 | 145 KB | 62 KB (43%) | ✓ | 3rd |
| https://arthritisfoundation.tfaforms.net/wForms/3.11/js/wforms.js?v=1776894461 | 84 KB | 59 KB (71%) | ✓ | 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 InventoryAction170 resources · 9.1 MB · 1.4 MB savings availableFIX
~1.4 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 170 resources | 9.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction26 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
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
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
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 CostAction1001ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.arthritis.org/ | 288ms | 6ms | 3ms | 3rd |
| Unattributable | 175ms | 6ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MDN8XH | 128ms | 109ms | 15ms | 3rd |
| https://static.fundraiseup.com/checkout.621abe447e62aa70.js | 89ms | 53ms | 36ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-936138255&cx=c>m=4e64k1h2 | 74ms | 65ms | 8ms | 3rd |
| https://widget.instabot.io/jsapi/rokoInstabot.js | 69ms | 46ms | 21ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-ZLEF548DVM&cx=c>m=4e64k1h2 | 63ms | 50ms | 13ms | 3rd |
| https://www.arthritis.org/bundles/arthritis?v=CXl2_lVGnGaHPxSQ1KqbRMzFm2XiO6cAHktounrY3Vw1 | 60ms | 33ms | 11ms | 3rd |
| https://assets.ubembed.com/universalscript/releases/v0.184.0/bundle.js | 55ms | 40ms | 13ms | 3rd |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (248 KB)PASS
Web fonts
7
248 KB total
Render-blocking
0
of 7
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
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall170 requests over 4392msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.arthritis.org www.arthritis.org | Other | 288ms | 16 KB | — | €3/mo | Costly |
Unattributable Unattributable | Other | 175ms | 0 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 128ms | 192 KB | 30% | €1/mo | Optional |
static.fundraiseup.com static.fundraiseup.com | Other | 89ms | 411 KB | 89% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 74ms | 145 KB | 43% | €1/mo | Optional |
widget.instabot.io widget.instabot.io | Other | 69ms | 222 KB | 45% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 63ms | 170 KB | 39% | €1/mo | Optional |
www.arthritis.org www.arthritis.org | Other | 60ms | 155 KB | 74% | €1/mo | Optional |
assets.ubembed.com assets.ubembed.com | Other | 55ms | 50 KB | 51% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.arthritis.org adds 288ms and costs ~€3/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
www.arthritis.org takes 288ms 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
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
74% of www.arthritis.org'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
51% of assets.ubembed.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