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.
663 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.17 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
276 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.052
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.64 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.
6.44 s
Page Load Progression
FPage Weight BudgetAction10.4 MB transferred, 197 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
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
DJS Execution CostAction2334ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://skyrock.fm/_next/static/chunks/10kmu.ey_xk6i.js | 989ms | 718ms | 56ms | 3rd |
| Unattributable | 546ms | 81ms | 0ms | 3rd |
| https://skyrock.fm/?orig=skyrock.com | 246ms | 8ms | 0ms | 3rd |
| https://skyrock.fm/_next/static/chunks/0747.2ii7s-u7.js | 200ms | 90ms | 8ms | 3rd |
| https://skyrock.fm/_next/static/chunks/0lj0aogqa~-1l.js | 124ms | 15ms | 6ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 90ms | 65ms | 15ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/ui-web-en-web.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 75ms | 32ms | 9ms | 3rd |
| https://skyrock.fm/_next/static/chunks/turbopack-0~-a1z4z53lz1.js | 63ms | 62ms | 2ms | 3rd |
FJS BundlesAction113 scripts, 989 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://skyrock.fm/_next/static/chunks/0v-be6g_ec77h.js | 113 KB | 107 KB (100%) | ✗ | 3rd |
| https://skyrock.fm/_next/static/chunks/0c50pobu41l5~.js | 112 KB | 89 KB (84%) | ✗ | 3rd |
| https://skyrock.fm/_next/static/chunks/14yfgdtko3jl_.js | 65 KB | 64 KB (100%) | ✗ | 3rd |
| https://skyrock.fm/_next/static/chunks/0vak1-65igbjf.js | 65 KB | 64 KB (100%) | ✗ | 3rd |
| https://skyrock.fm/_next/static/chunks/08h.7_oms-ksu.js | 64 KB | 64 KB (100%) | ✗ | 3rd |
| https://skyrock.fm/_next/static/chunks/0de5pfxywxull.js | 57 KB | 57 KB (100%) | ✗ | 3rd |
| https://skyrock.fm/_next/static/chunks/0e_owhy64tp2x.js | 118 KB | 56 KB (48%) | ✗ | 3rd |
| https://skyrock.fm/_next/static/chunks/066uu~b~m-f-h.js | 57 KB | 49 KB (86%) | ✗ | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 101 KB | 48 KB (48%) | ✓ | 3rd |
| https://skyrock.fm/_next/static/chunks/121o.aez9pbtp.js | 40 KB | 40 KB (100%) | ✗ | 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 InventoryAction197 resources · 10.4 MB · 989 KB savings availableFIX
~989.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 197 resources | 10.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization62 images, 0 KB saveableREVIEW
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 Loading3 fonts (104 KB)PASS
Web fonts
3
104 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
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 Waterfall197 requests over 3428msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
skyrock.fm skyrock.fm | Other | 989ms | 89 KB | 36% | €11/mo | Costly |
Unattributable Unattributable | Other | 546ms | 0 KB | — | €6/mo | Costly |
skyrock.fm skyrock.fm | Other | 246ms | 95 KB | — | €3/mo | Costly |
skyrock.fm skyrock.fm | Other | 200ms | 40 KB | — | €2/mo | Costly |
skyrock.fm skyrock.fm | Other | 124ms | 33 KB | — | €1/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 90ms | 101 KB | 48% | €1/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 75ms | 54 KB | — | €1/mo | Optional |
skyrock.fm skyrock.fm | Other | 63ms | 11 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- skyrock.fm adds 989ms and costs ~€11/month
- Unattributable adds 546ms and costs ~€6/month
- skyrock.fm adds 246ms and costs ~€3/month
- skyrock.fm adds 200ms 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
skyrock.fm takes 989ms 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
Unattributable takes 546ms 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
skyrock.fm takes 246ms 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
skyrock.fm takes 200ms 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