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.
3.12 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
48.69 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
3.23 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.014
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.81 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.
52.76 s
Page Load Progression
FPage Weight BudgetAction14.0 MB transferred, 164 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
FJS Execution CostAction10793ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://skyrock.fm/_next/static/chunks/10kmu.ey_xk6i.js | 4029ms | 3098ms | 90ms | 3rd |
| Unattributable | 2077ms | 357ms | 0ms | 3rd |
| https://skyrock.fm/?orig=skyrock.com | 1312ms | 20ms | 1ms | 3rd |
| https://skyrock.fm/_next/static/chunks/0747.2ii7s-u7.js | 653ms | 277ms | 32ms | 3rd |
| https://skyrock.fm/_next/static/chunks/0lj0aogqa~-1l.js | 486ms | 45ms | 26ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 409ms | 285ms | 73ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/ui-web-en-web.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 304ms | 138ms | 38ms | 3rd |
| https://skyrock.fm/_next/static/chunks/turbopack-0~-a1z4z53lz1.js | 294ms | 286ms | 7ms | 3rd |
| https://skyrock.fm/_next/static/chunks/01s_r9lqcw4ux.js | 205ms | 2ms | 202ms | 3rd |
| https://pipo.skyrock.net/matomo.js | 139ms | 111ms | 27ms | 3rd |
Showing top 10 of 21 scripts
FJS BundlesAction73 scripts, 816 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 | 64 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/0y~2vl~1yppne.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 InventoryAction164 resources · 14.0 MB · 816 KB savings availableFIX
~815.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 164 resources | 14.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization69 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 Hints14 hints, 0 missing preconnectsPASS
Current Resource Hints
14 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall164 requests over 3453msINFO
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 | 4029ms | 89 KB | 36% | €44/mo | Costly |
Unattributable Unattributable | Other | 2077ms | 0 KB | — | €23/mo | Costly |
skyrock.fm skyrock.fm | Other | 1312ms | 95 KB | — | €14/mo | Costly |
skyrock.fm skyrock.fm | Other | 653ms | 40 KB | — | €7/mo | Costly |
skyrock.fm skyrock.fm | Other | 486ms | 33 KB | — | €5/mo | Costly |
sdk.privacy-center.org sdk.privacy-center.org | Other | 409ms | 101 KB | 48% | €4/mo | Costly |
sdk.privacy-center.org sdk.privacy-center.org | Other | 304ms | 54 KB | — | €3/mo | Costly |
skyrock.fm skyrock.fm | Other | 294ms | 11 KB | — | €3/mo | Costly |
skyrock.fm skyrock.fm | Other | 205ms | 330 KB | 6% | €2/mo | Costly |
pipo.skyrock.net pipo.skyrock.net | Other | 139ms | 31 KB | — | €2/mo | Optional |
skyrock.fm skyrock.fm | Other | 126ms | 118 KB | 48% | €1/mo | Optional |
skyrock.fm skyrock.fm | Other | 112ms | 113 KB | 100% | €1/mo | Optional |
skyrock.fm skyrock.fm | Other | 110ms | 112 KB | 84% | €1/mo | Optional |
skyrock.fm skyrock.fm | Other | 105ms | 134 KB | 24% | €1/mo | Optional |
skyrock.fm skyrock.fm | Other | 95ms | 37 KB | — | €1/mo | Optional |
skyrock.fm skyrock.fm | Other | 61ms | 65 KB | 100% | €1/mo | Optional |
skyrock.fm skyrock.fm | Other | 58ms | 65 KB | — | €1/mo | Optional |
skyrock.fm skyrock.fm | Other | 57ms | 64 KB | 100% | €1/mo | Optional |
skyrock.fm skyrock.fm | Other | 56ms | 64 KB | 100% | €1/mo | Optional |
skyrock.fm skyrock.fm | Other | 52ms | 22 KB | — | €1/mo | Optional |
skyrock.fm skyrock.fm | Other | 52ms | 57 KB | 86% | €1/mo | Optional |
These scripts may cost more than they're worth
- skyrock.fm adds 4029ms and costs ~€44/month
- Unattributable adds 2077ms and costs ~€23/month
- skyrock.fm adds 1312ms and costs ~€14/month
- skyrock.fm adds 653ms and costs ~€7/month
- skyrock.fm adds 486ms and costs ~€5/month
- sdk.privacy-center.org adds 409ms and costs ~€4/month
- sdk.privacy-center.org adds 304ms and costs ~€3/month
- skyrock.fm adds 294ms and costs ~€3/month
- skyrock.fm adds 205ms 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 4029ms 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 2077ms 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 1312ms 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 653ms 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 486ms 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
sdk.privacy-center.org takes 409ms 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
sdk.privacy-center.org takes 304ms 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 294ms 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 205ms 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
100% of skyrock.fm'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
84% of skyrock.fm'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
100% of skyrock.fm'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
100% of skyrock.fm'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
100% of skyrock.fm'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
86% of skyrock.fm'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