Performance
· 23 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.
1.03 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.92 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
10 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.061
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.28 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.
2.23 s
Page Load Progression
5.5 s
11.1 s
16.6 s
22.2 s
27.7 s
33.3 s
38.8 s
44.4 sFPage Weight BudgetAction3.3 MB transferred, 192 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
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
DJS Execution CostAction2347ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://schalke04.de/ | 1066ms | 47ms | 2ms | 1st |
| Unattributable | 598ms | 73ms | 0ms | 1st |
| https://schalke04.de/firebase/static/js/main.js?ver=release/1.2.9-20260729 | 232ms | 178ms | 21ms | 1st |
| https://schalke04.de/content/themes/fcschalke04/assets/js/vendor/requirejs/require.js?ver=release/1.2.9-20260729 | 160ms | 101ms | 2ms | 1st |
| https://www.googletagmanager.com/gtm.js?id=GTM-PVT8RKX | 97ms | 77ms | 13ms | 3rd |
| https://app.usercentrics.eu/browser-ui/3.104.0/index.module.js | 81ms | 63ms | 0ms | 3rd |
| https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496 | 60ms | 42ms | 0ms | 3rd |
| https://schalke04.de/content/themes/fcschalke04/assets/js/main.js?1785508187 | 52ms | 21ms | 25ms | 1st |
FJS BundlesAction58 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 | 111 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 | 78 KB (44%) | ✓ | 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://partner.schalke04.de/partner/intern/cw_31_2026_Business_Kreisel_LB2/js/plugins.js | 1 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 InventoryAction192 resources · 3.3 MB · 551 KB savings availableFIX
~550.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 192 resources | 3.3 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 Impact48% 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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
A+Text CompressionAll text resources are compressedPASS
A+Font Loading14 fonts (627 KB)PASS
Web fonts
14
627 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 HintsNo optimization neededPASS
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+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall192 requests over 2420msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 97ms | 176 KB | 44% | €1/mo | Optional |
app.usercentrics.eu app.usercentrics.eu | Other | 81ms | 121 KB | 44% | €1/mo | Optional |
static.cloudflareinsights.com static.cloudflareinsights.com | Other | 60ms | 0 KB | — | €1/mo | Optional |
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