Performance
· 24 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.
1.06 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.08 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.057
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.90 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.
2.09 s
Page Load Progression
FPage Weight BudgetAction3.4 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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
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
DJS Execution CostAction2131ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://schalke04.de/ | 1023ms | 36ms | 2ms | 1st |
| Unattributable | 461ms | 61ms | 0ms | 1st |
| https://schalke04.de/firebase/static/js/main.js?ver=release/1.2.9-20261106 | 200ms | 152ms | 15ms | 1st |
| https://schalke04.de/content/themes/fcschalke04/assets/js/vendor/requirejs/require.js?ver=release/1.2.9-20261106 | 149ms | 97ms | 2ms | 1st |
| https://www.googletagmanager.com/gtm.js?id=GTM-PVT8RKX | 101ms | 86ms | 13ms | 3rd |
| https://app.usercentrics.eu/browser-ui/3.113.0/index.module.js | 86ms | 67ms | 0ms | 3rd |
| https://static.cloudflareinsights.com/beacon.min.js/vce701823e78c4301a35b7e07294d87301792088814092 | 59ms | 46ms | 0ms | 3rd |
| https://schalke04.de/content/themes/fcschalke04/assets/js/main.js?1794229897 | 52ms | 18ms | 25ms | 1st |
FJS BundlesAction57 scripts, 547 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.jsdelivr.net/npm/hls.js@latest | 152 KB | 137 KB (91%) | ✓ | 3rd |
| https://schalke04.de/firebase/static/js/main.js?ver=release/1.2.9-20261106 | 215 KB | 112 KB (52%) | ✓ | 1st |
| https://schalke04.de/content/themes/fcschalke04/assets/js/main.js?1794229897 | 232 KB | 88 KB (38%) | ✗ | 1st |
| https://www.googletagmanager.com/gtm.js?id=GTM-PVT8RKX | 194 KB | 78 KB (41%) | ✓ | 3rd |
| https://app.usercentrics.eu/browser-ui/3.113.0/index.module.js | 121 KB | 53 KB (44%) | ✓ | 3rd |
| https://siteintercept.qualtrics.com/dxjsmodule/64.52be4488e28de16750e4.chunk.js?Q_CLIENTVERSION=2.61.0&Q_CLIENTTYPE=web&Q_BRANDID=schalke04.de | 38 KB | 29 KB (77%) | ✓ | 3rd |
| https://app.usercentrics.eu/browser-ui/3.113.0/VirtualServiceItem-e06b8d01.js | 51 KB | 28 KB (55%) | ✓ | 3rd |
| https://schalke04.de/cms/wp-includes/js/jquery/jquery.min.js?ver=3.6.0 | 31 KB | 22 KB (72%) | ✓ | 1st |
| https://partner.schalke04.de/partner/DAZN/cw_35_2026/js/plugins.js | 1 KB | — | ✓ | 3rd |
| https://static.cloudflareinsights.com/beacon.min.js/vce701823e78c4301a35b7e07294d87301792088814092 | 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 · 3.4 MB · 547 KB savings availableFIX
~547.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 192 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 Impact46% third-party, 0 ms blockingREVIEW
CImage OptimizationAction74 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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
A+Text CompressionAll text resources are compressedPASS
A+Font Loading14 fonts (638 KB)PASS
Web fonts
14
638 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 ~234 KB and ~468 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Document CompressionDocument 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
Asset CompressionNo text asset hosts to measureINFO
Network Waterfall192 requests over 2395msINFO
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 | 101ms | 194 KB | 41% | €0/mo | Optional |
app.usercentrics.eu app.usercentrics.eu | Other | 86ms | 121 KB | 44% | €0/mo | Optional |
static.cloudflareinsights.com static.cloudflareinsights.com | Other | 59ms | 0 KB | — | €0/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 (2026-10-11 — 2026-11-07)
LCP (p75)
1573 ms
89% good
INP (p75)
112 ms
92% good
CLS (p75)
1.180
16% good
FCP (p75)
1230 ms
TTFB (p75)
365 ms
Image Optimization66 images, 203 KB total, 36 KB wastedINFO
Image Optimization Audit
Total Images
66
Total Size
203 KB
Oversized
5
Wasted
36 KB