Performance
· 17 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.
13.59 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
41.19 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.73 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.112
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
13.59 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.
41.61 s
Page Load Progression
FPage Weight BudgetAction7.3 MB transferred, 169 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 Execution CostAction5558ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 660ms | 22ms | 0ms | 3rd |
| https://www.arthritis.org/ | 470ms | 23ms | 6ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MDN8XH | 455ms | 390ms | 48ms | 3rd |
| https://cdn.fundraiseup.com/widget/AEWKBBRG | 427ms | 130ms | 21ms | 3rd |
| https://static.fundraiseup.com/checkout.621abe447e62aa70.js | 314ms | 175ms | 139ms | 3rd |
| https://widget.instabot.io/jsapi/rokoInstabot.js | 296ms | 204ms | 80ms | 3rd |
| https://www.arthritis.org/bundles/arthritis?v=CXl2_lVGnGaHPxSQ1KqbRMzFm2XiO6cAHktounrY3Vw1 | 260ms | 176ms | 46ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-936138255&cx=c>m=4e64k0 | 237ms | 206ms | 30ms | 3rd |
| https://assets.ubembed.com/universalscript/releases/v0.184.0/bundle.js | 224ms | 153ms | 60ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-ZLEF548DVM&cx=c>m=4e64k0 | 224ms | 187ms | 35ms | 3rd |
Showing top 10 of 27 scripts
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 (73%) | ✓ | 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=4e64k0 | 170 KB | 66 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-T7NLVT98E8&cx=c>m=4e64k0 | 157 KB | 66 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-12914008&cx=c>m=4e64k0 | 129 KB | 63 KB (48%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-936138255&cx=c>m=4e64k0 | 144 KB | 60 KB (42%) | ✓ | 3rd |
| https://arthritisfoundation.tfaforms.net/wForms/3.11/js/wforms.js?v=1776894437 | 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 InventoryAction169 resources · 7.3 MB · 1.4 MB savings availableFIX
~1.4 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 169 resources | 7.3 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
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 Hints4 hints, 0 missing preconnectsPASS
Current Resource Hints
4 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall169 requests over 7213msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 660ms | 0 KB | — | €7/mo | Costly |
www.arthritis.org www.arthritis.org | Other | 470ms | 16 KB | — | €5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 455ms | 192 KB | 30% | €5/mo | Costly |
cdn.fundraiseup.com cdn.fundraiseup.com | Other | 427ms | 66 KB | 33% | €5/mo | Costly |
static.fundraiseup.com static.fundraiseup.com | Other | 314ms | 411 KB | 89% | €3/mo | Costly |
widget.instabot.io widget.instabot.io | Other | 296ms | 222 KB | 45% | €3/mo | Costly |
www.arthritis.org www.arthritis.org | Other | 260ms | 155 KB | 73% | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 237ms | 144 KB | 42% | €3/mo | Costly |
assets.ubembed.com assets.ubembed.com | Other | 224ms | 50 KB | 51% | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 224ms | 170 KB | 39% | €2/mo | Costly |
cdn.evgnet.com cdn.evgnet.com | Other | 220ms | 46 KB | — | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 215ms | 157 KB | 42% | €2/mo | Costly |
static.fundraiseup.com static.fundraiseup.com | Other | 185ms | 4 KB | — | €2/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 183ms | 25 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 162ms | 137 KB | 42% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 150ms | 129 KB | 48% | €2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 126ms | 97 KB | 45% | €1/mo | Optional |
Twitter/X Embed platform.twitter.com | Social | 120ms | 27 KB | — | €1/mo | Optional |
az416426.vo.msecnd.net az416426.vo.msecnd.net | Other | 115ms | 22 KB | — | €1/mo | Optional |
ajax.googleapis.com ajax.googleapis.com | Other | 79ms | 30 KB | 74% | €1/mo | Optional |
static.cloudflareinsights.com static.cloudflareinsights.com | Other | 75ms | 11 KB | — | €1/mo | Optional |
arthritisfoundation.tfaforms.net arthritisfoundation.tfaforms.net | Other | 70ms | 84 KB | 71% | €1/mo | Optional |
static.fundraiseup.com static.fundraiseup.com | Other | 70ms | 140 KB | — | €1/mo | Optional |
s.pinimg.com s.pinimg.com | Other | 59ms | 28 KB | — | €1/mo | Optional |
js.adsrvr.org js.adsrvr.org | Other | 55ms | 12 KB | — | €1/mo | Optional |
tags.srv.stackadapt.com tags.srv.stackadapt.com | Other | 55ms | 8 KB | — | €1/mo | Optional |
arthritisfoundation.tfaforms.net arthritisfoundation.tfaforms.net | Other | 50ms | 6 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 660ms and costs ~€7/month
- www.arthritis.org adds 470ms and costs ~€5/month
- Google Tag Manager adds 455ms and costs ~€5/month
- cdn.fundraiseup.com adds 427ms and costs ~€5/month
- static.fundraiseup.com adds 314ms and costs ~€3/month
- widget.instabot.io adds 296ms and costs ~€3/month
- www.arthritis.org adds 260ms and costs ~€3/month
- Google Tag Manager adds 237ms and costs ~€3/month
- assets.ubembed.com adds 224ms and costs ~€2/month
- Google Tag Manager adds 224ms and costs ~€2/month
- cdn.evgnet.com adds 220ms and costs ~€2/month
- Google Tag Manager adds 215ms and costs ~€2/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 660ms 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.arthritis.org takes 470ms 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
Google Tag Manager takes 455ms 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
cdn.fundraiseup.com takes 427ms 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
static.fundraiseup.com takes 314ms 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
widget.instabot.io takes 296ms 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.arthritis.org takes 260ms 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
73% 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
Google Tag Manager takes 237ms 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
assets.ubembed.com takes 224ms 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
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
Google Tag Manager takes 224ms 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
cdn.evgnet.com takes 220ms 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
Google Tag Manager takes 215ms 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
74% of ajax.googleapis.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
71% of arthritisfoundation.tfaforms.net'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