Performance
· 27 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.
9.49 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
20.32 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
900 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.519
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
9.49 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.
21.47 s
Page Load Progression
FPage Weight BudgetAction3.4 MB transferred, 199 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
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
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
FJS Execution CostAction6939ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 1977ms | 191ms | 0ms | 1st |
| https://app.usercentrics.eu/browser-ui/3.104.0/index.module.js | 1260ms | 385ms | 2ms | 3rd |
| https://schalke04.de/firebase/static/js/main.js?ver=release/1.2.9-20260729 | 897ms | 700ms | 80ms | 1st |
| https://schalke04.de/ | 885ms | 165ms | 5ms | 1st |
| https://schalke04.de/content/themes/fcschalke04/assets/js/main.js?1785508187 | 494ms | 100ms | 133ms | 1st |
| https://www.googletagmanager.com/gtm.js?id=GTM-PVT8RKX | 416ms | 356ms | 50ms | 3rd |
| https://schalke04.de/content/themes/fcschalke04/assets/js/vendor/requirejs/require.js?ver=release/1.2.9-20260729 | 349ms | 232ms | 6ms | 1st |
| https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496 | 217ms | 158ms | 0ms | 3rd |
| https://apis.google.com/_/scs/abc-static/_/js/k=gapi.lb.en.9vdPKhB0RUg.O/m=gapi_iframes/rt=j/sv=1/d=1/ed=1/rs=AHpOoo97anj7zZ432JcN58tqJJp_A6WeOw/cb=gapi.loaded_0?le=scs | 97ms | 85ms | 8ms | 3rd |
| https://schalke04.de/cms/wp-includes/js/jquery/jquery.min.js?ver=3.6.0 | 85ms | 48ms | 7ms | 1st |
Showing top 10 of 14 scripts
FJS BundlesAction62 scripts, 551 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.jsdelivr.net/npm/hls.js@latest | 160 KB | 145 KB (91%) | ✓ | 3rd |
| https://schalke04.de/firebase/static/js/main.js?ver=release/1.2.9-20260729 | 213 KB | 110 KB (52%) | ✓ | 1st |
| https://schalke04.de/content/themes/fcschalke04/assets/js/main.js?1785508187 | 223 KB | 85 KB (38%) | ✗ | 1st |
| https://www.googletagmanager.com/gtm.js?id=GTM-PVT8RKX | 176 KB | 79 KB (45%) | ✓ | 3rd |
| https://app.usercentrics.eu/browser-ui/3.104.0/index.module.js | 121 KB | 53 KB (44%) | ✓ | 3rd |
| https://siteintercept.qualtrics.com/dxjsmodule/941.769e075aa2ef88969a43.chunk.js?Q_CLIENTVERSION=2.53.0&Q_CLIENTTYPE=web&Q_BRANDID=schalke04.de | 38 KB | 29 KB (77%) | ✓ | 3rd |
| https://app.usercentrics.eu/browser-ui/3.104.0/VirtualServiceItem-21018cfe.js | 50 KB | 28 KB (55%) | ✓ | 3rd |
| https://schalke04.de/cms/wp-includes/js/jquery/jquery.min.js?ver=3.6.0 | 32 KB | 23 KB (72%) | ✓ | 1st |
| https://schalke-04-app.firebaseapp.com/__/auth/iframe.js | 93 KB | — | ✓ | 3rd |
| https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496 | 0 KB | — | ✓ | 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 InventoryAction199 resources · 3.4 MB · 551 KB savings availableFIX
~550.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 199 resources | 3.4 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
no-store, no-cache, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| no-store | — | Never cache this response |
| no-cache | — | Cache but always revalidate first |
| must-revalidate | — | Must recheck with server after expiry |
BThird-Party Impact49% third-party, 0 ms blockingREVIEW
CImage OptimizationAction73 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
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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
BJavaScript Blocking2 JS blocking issue(s) detectedREVIEW
A+Text CompressionAll text resources are compressedPASS
A+Font Loading14 fonts (628 KB)PASS
Web fonts
14
628 KB total
Render-blocking
0
of 14
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- 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)
Fixing the unchecked items could save ~231 KB and ~462 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints10 hints, 0 missing preconnectsPASS
Current Resource Hints
10 resource hints configured
A+Compression AlgorithmMain response uses brotliPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Main HTML Cache-ControlMain HTML uses no-store -- correct for sensitive/dynamic contentPASS
A+Server-Timing Observability3 Server-Timing entries advertisedPASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
ACSS Performance Depth1 CSS depth issue(s) 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 Waterfall199 requests over 3318msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
app.usercentrics.eu app.usercentrics.eu | Other | 1260ms | 121 KB | 44% | €14/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 416ms | 176 KB | 45% | €5/mo | Costly |
static.cloudflareinsights.com static.cloudflareinsights.com | Other | 217ms | 0 KB | — | €2/mo | Costly |
apis.google.com apis.google.com | Other | 97ms | 34 KB | — | €1/mo | Optional |
jsDelivr cdn.jsdelivr.net | CDN | 65ms | 160 KB | 91% | €1/mo | Optional |
l.ecn-ldr.de l.ecn-ldr.de | Other | 58ms | 23 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- app.usercentrics.eu adds 1260ms and costs ~€14/month
- Google Tag Manager adds 416ms and costs ~€5/month
- static.cloudflareinsights.com adds 217ms and costs ~€2/month
app.usercentrics.eu takes 1260ms 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 416ms 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.cloudflareinsights.com takes 217ms 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
91% of jsDelivr'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
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-07-02 — 2026-07-29)
LCP (p75)
1652 ms
88% good
INP (p75)
106 ms
93% good
CLS (p75)
1.050
19% good
FCP (p75)
1307 ms
TTFB (p75)
361 ms
Image Optimization66 images, 171 KB total, 45 KB wastedINFO
Image Optimization Audit
Total Images
66
Total Size
171 KB
Oversized
5
Wasted
45 KB