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.
468 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.15 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
101 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.184
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
540 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
3.34 s
Page Load Progression
FPage Weight BudgetAction3.4 MB transferred, 58 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
FJS BundlesAction28 scripts, 598 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://opencollective.com/_next/static/chunks/appCommon-8ef9f2ad60d02f5d.js | 471 KB | 297 KB (63%) | ✓ | 1st |
| https://opencollective.com/_next/static/chunks/framework-859673bda8a51a7d.js | 115 KB | 79 KB (69%) | ✓ | 1st |
| https://opencollective.com/_next/static/chunks/1321-d9be0253e305e9b9.js | 0 KB | 56 KB (46%) | ✓ | 1st |
| https://opencollective.com/_next/static/chunks/1321-d9be0253e305e9b9.js | 40 KB | 56 KB (46%) | ✓ | 1st |
| https://opencollective.com/_next/static/chunks/1586-19927f5c8b6f7147.js | 0 KB | 24 KB (81%) | ✓ | 1st |
| https://opencollective.com/_next/static/chunks/1586-19927f5c8b6f7147.js | 11 KB | 24 KB (81%) | ✓ | 1st |
| https://opencollective.com/_next/static/chunks/435-859c19df3b862776.js | 27 KB | 21 KB (82%) | ✓ | 1st |
| https://opencollective.com/_next/static/chunks/8160-a466f96e1bf8db74.js | 9 KB | 20 KB (87%) | ✓ | 1st |
| https://opencollective.com/_next/static/chunks/8160-a466f96e1bf8db74.js | 0 KB | 20 KB (87%) | ✓ | 1st |
| https://opencollective.com/_next/static/S7vam5TMQZklbtaSE71JS/_ssgManifest.js | 1 KB | — | ✓ | 1st |
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
DPage Weight InventoryAction58 resources · 3.4 MB · 598 KB savings availableFIX
~598.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 58 resources | 3.4 MiB | ||||||
BImage Optimization19 images, 0 KB saveableREVIEW
BJS Execution Cost770ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://opencollective.com/_next/static/chunks/framework-859673bda8a51a7d.js | 196ms | 173ms | 11ms | 1st |
| https://opencollective.com/ | 191ms | 4ms | 0ms | 1st |
| Unattributable | 153ms | 2ms | 0ms | 3rd |
| https://opencollective.com/_next/static/chunks/pages/_app-f01c383910bb7bc5.js | 152ms | 147ms | 5ms | 1st |
| https://opencollective.com/_next/static/chunks/appCommon-8ef9f2ad60d02f5d.js | 79ms | 25ms | 50ms | 1st |
A+Third-Party Impact12% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (483 KB)PASS
Web fonts
5
483 KB total
Render-blocking
0
of 5
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
AHTTP Cachingmax-age=60 (1 minute)PASS
public, max-age=60
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 60 | Cache for 1 minute |
Network Waterfall58 requests over 1009msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 153ms | 0 KB | — | €2/mo | Optional |