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.
5.23 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
12.57 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.70 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.022
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.12 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.
21.99 s
Page Load Progression
FPage Weight BudgetAction10.6 MB transferred, 93 requestsFIX
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction7026ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 1331ms | 164ms | 0ms | 3rd |
| https://creators.spotify.com/ | 785ms | 5ms | 1ms | 3rd |
| https://microfrontend-nonhosted-cdn.spotifycdn.com/_next/static/chunks/main-083af13210008757.js | 747ms | 617ms | 47ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NFX358T | 677ms | 587ms | 72ms | 3rd |
| https://microfrontend-nonhosted-cdn.spotifycdn.com/_next/static/chunks/framework-48e6b50addfa2522.js | 504ms | 476ms | 20ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-B7DHJZL7G0&cx=c>m=4e64h1 | 445ms | 363ms | 78ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js | 421ms | 289ms | 71ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-BMC5VGR8YS&cx=c&_slc=1 | 359ms | 298ms | 56ms | 3rd |
| https://microfrontend-nonhosted-cdn.spotifycdn.com/_next/static/chunks/pages/_app-4996a8f7eaf00e38.js | 338ms | 264ms | 72ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-9266237&cx=c>m=4e64h1 | 319ms | 249ms | 67ms | 3rd |
Showing top 10 of 16 scripts
FJS BundlesAction35 scripts, 564 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-B7DHJZL7G0&cx=c>m=4e64h1 | 176 KB | 70 KB (40%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js | 128 KB | 70 KB (55%) | ✓ | 3rd |
| https://microfrontend-nonhosted-cdn.spotifycdn.com/_next/static/chunks/pages/_app-4996a8f7eaf00e38.js | 160 KB | 70 KB (44%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NFX358T | 171 KB | 67 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-BMC5VGR8YS&cx=c&_slc=1 | 149 KB | 64 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-9266237&cx=c>m=4e64h1 | 130 KB | 62 KB (48%) | ✓ | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js | 110 KB | 55 KB (51%) | ✓ | 3rd |
| https://microfrontend-nonhosted-cdn.spotifycdn.com/_next/static/chunks/main-083af13210008757.js | 92 KB | 45 KB (49%) | ✓ | 3rd |
| https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js | 57 KB | 38 KB (67%) | ✓ | 3rd |
| https://microfrontend-nonhosted-cdn.spotifycdn.com/_next/static/chunks/9495-562434c74ec7ab36.js | 38 KB | 24 KB (65%) | ✓ | 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 InventoryAction93 resources · 10.6 MB · 564 KB savings availableFIX
~564.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 93 resources | 10.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction11 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
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 (143 KB)PASS
Web fonts
3
143 KB total
Render-blocking
0
of 3
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 Hints1 hints, 0 missing preconnectsPASS
Current Resource Hints
1 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall93 requests over 4787msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 1331ms | 0 KB | — | €14/mo | Costly |
creators.spotify.com creators.spotify.com | Other | 785ms | 15 KB | — | €9/mo | Costly |
microfrontend-nonhosted-cdn.spotifycdn.com microfrontend-nonhosted-cdn.spotifycdn.com | Other | 747ms | 92 KB | 49% | €8/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 677ms | 171 KB | 39% | €7/mo | Costly |
microfrontend-nonhosted-cdn.spotifycdn.com microfrontend-nonhosted-cdn.spotifycdn.com | Other | 504ms | 44 KB | — | €5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 445ms | 176 KB | 40% | €5/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 421ms | 128 KB | 55% | €5/mo | Essential |
Google Tag Manager www.googletagmanager.com | Tag Manager | 359ms | 149 KB | 43% | €4/mo | Costly |
microfrontend-nonhosted-cdn.spotifycdn.com microfrontend-nonhosted-cdn.spotifycdn.com | Other | 338ms | 160 KB | 44% | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 319ms | 130 KB | 48% | €3/mo | Costly |
microfrontend-nonhosted-cdn.spotifycdn.com microfrontend-nonhosted-cdn.spotifycdn.com | Other | 312ms | 8 KB | — | €3/mo | Costly |
analytics.tiktok.com analytics.tiktok.com | Other | 288ms | 110 KB | 51% | €3/mo | Costly |
Hotjar script.hotjar.com | Session Replay | 238ms | 57 KB | 67% | €3/mo | Costly |
microfrontend-nonhosted-cdn.spotifycdn.com microfrontend-nonhosted-cdn.spotifycdn.com | Other | 101ms | 38 KB | 65% | €1/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 85ms | 21 KB | — | €1/mo | Optional |
analytics.tiktok.com analytics.tiktok.com | Other | 76ms | 40 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 1331ms and costs ~€14/month
- creators.spotify.com adds 785ms and costs ~€9/month
- microfrontend-nonhosted-cdn.spotifycdn.com adds 747ms and costs ~€8/month
- Google Tag Manager adds 677ms and costs ~€7/month
- microfrontend-nonhosted-cdn.spotifycdn.com adds 504ms and costs ~€5/month
- Google Tag Manager adds 445ms and costs ~€5/month
- Google Tag Manager adds 359ms and costs ~€4/month
- microfrontend-nonhosted-cdn.spotifycdn.com adds 338ms and costs ~€4/month
- Google Tag Manager adds 319ms and costs ~€3/month
- microfrontend-nonhosted-cdn.spotifycdn.com adds 312ms and costs ~€3/month
- analytics.tiktok.com adds 288ms and costs ~€3/month
- Hotjar adds 238ms 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
Unattributable takes 1331ms 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
creators.spotify.com takes 785ms 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
microfrontend-nonhosted-cdn.spotifycdn.com takes 747ms 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 677ms 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
microfrontend-nonhosted-cdn.spotifycdn.com takes 504ms 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 445ms 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
55% of OneTrust'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 359ms 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
microfrontend-nonhosted-cdn.spotifycdn.com takes 338ms 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 319ms 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
microfrontend-nonhosted-cdn.spotifycdn.com takes 312ms 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
analytics.tiktok.com 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
51% of analytics.tiktok.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
Hotjar takes 238ms 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
67% of Hotjar'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
65% of microfrontend-nonhosted-cdn.spotifycdn.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