Gescannt am June 23, 2026
Sortiert nach Score-Wirkung — jede Behebung verbessert Ihre Gesamtnote.
Gewichtung: 25% · 8 bestanden · 7 Warnungen · 2 fehlgeschlagen · 1 SPA (manuell prüfen)
Warum es wichtig ist: Pages over 3 MB take 12+ seconds on 3G. The average e-commerce page is 2.2 MB — you're well above that. Amazon found every 100ms of latency costs 1% of sales.
So beheben: Critical: your page is over 3 MB. 1) Convert all images to WebP/AVIF, 2) Lazy load everything below the fold, 3) Remove unused plugins, 4) Combine and minify CSS/JS, 5) Enable brotli compression.
Nachweis: PSI-lab · Konfidenz: high
Was wir gefunden haben: 3.6 MB, 140 requests — too heavy!
Warum es wichtig ist: Pages over 3 MB take 12+ seconds on 3G. The average e-commerce page is 2.2 MB — you're well above that. Amazon found every 100ms of latency costs 1% of sales.
Warum es wichtig ist: Each CSS file blocks rendering. With 91 files, the browser must download all of them before painting anything. This can add 1-2+ seconds on mobile networks.
So beheben: Bundle your CSS files into 1-3 files maximum. Use a build tool (Webpack, Vite, Gulp) to concatenate and minify. Critical CSS should be inlined, the rest deferred.
Nachweis: HTML-heuristic · Konfidenz: high
Was wir gefunden haben: 91 CSS files — too many!
Warum es wichtig ist: Each CSS file blocks rendering. With 91 files, the browser must download all of them before painting anything. This can add 1-2+ seconds on mobile networks.
Warum es wichtig ist: LCP is a Core Web Vital that directly impacts Google rankings. Sites failing LCP are demoted in search results. The #1 cause of slow LCP is unoptimized hero images.
So beheben: Optimize your largest element (usually hero image or product image): preload it with <link rel='preload'>, use WebP/AVIF format, set explicit width/height, and serve from CDN.
Nachweis: PSI-lab · Konfidenz: high
Was wir gefunden haben: 3.73s (good: <2.5s) — Core Web Vital
Warum es wichtig ist: LCP is a Core Web Vital that directly impacts Google rankings. Sites failing LCP are demoted in search results. The #1 cause of slow LCP is unoptimized hero images.
Warum es wichtig ist: Unused code is downloaded and parsed but never executed — pure waste. Removing it speeds up parse time and reduces bandwidth.
So beheben: Remove unused CSS with PurgeCSS or UnCSS. Code-split JavaScript so only needed code loads per page. Audit plugins — each adds CSS/JS.
Nachweis: PSI-lab · Konfidenz: low
Was wir gefunden haben: 180 KB unused (CSS: 45 KB, JS: 135 KB)
Warum es wichtig ist: Unused code is downloaded and parsed but never executed — pure waste. Removing it speeds up parse time and reduces bandwidth.
Hinweis: Diese Prüfung nutzt heuristische Erkennung und kann False Positives produzieren. Manuelle Verifizierung empfohlen.
Warum es wichtig ist: font-display: block hides text until the font loads (FOIT) — users see a blank page. 'swap' shows text immediately with a fallback font.
So beheben: Use font-display: swap (shows fallback immediately, swaps when loaded) or font-display: optional (best for performance — may skip custom font on slow connections).
Nachweis: HTML-heuristic · Konfidenz: high
Was wir gefunden haben: font-display: auto
Warum es wichtig ist: font-display: block hides text until the font loads (FOIT) — users see a blank page. 'swap' shows text immediately with a fallback font.
Warum es wichtig ist: Synchronous scripts block HTML parsing — the browser stops rendering until each script downloads and executes. Async/defer allows parallel downloading without blocking.
So beheben: Add 'defer' to scripts that don't need to run immediately, 'async' for independent scripts. Use type='module' for modern ES modules. Only critical inline scripts should be synchronous.
Nachweis: HTML-heuristic · Konfidenz: high
Was wir gefunden haben: Only 40% of 52 scripts use async/defer
Warum es wichtig ist: Synchronous scripts block HTML parsing — the browser stops rendering until each script downloads and executes. Async/defer allows parallel downloading without blocking.
Warum es wichtig ist: Fonts are discovered late in the render pipeline (after CSS is parsed). Preloading tells the browser to download them immediately, reducing Flash of Invisible Text (FOIT) by 200-500ms.
So beheben: Preload your primary font: <link rel='preload' href='/fonts/main.woff2' as='font' type='font/woff2' crossorigin>. For Google Fonts: preconnect to fonts.gstatic.com.
Nachweis: HTML-heuristic · Konfidenz: high
Was wir gefunden haben: Custom fonts detected without preload hints
Warum es wichtig ist: Fonts are discovered late in the render pipeline (after CSS is parsed). Preloading tells the browser to download them immediately, reducing Flash of Invisible Text (FOIT) by 200-500ms.
Warum es wichtig ist: Render-blocking CSS delays first paint. Inlining critical CSS eliminates the render-blocking round trip — the biggest FCP improvement for CSS-heavy sites.
So beheben: Extract critical above-the-fold CSS and inline it in <head>. Load remaining CSS asynchronously: <link rel='preload' href='styles.css' as='style' onload='this.rel="stylesheet"'>.
Nachweis: PSI-lab · Konfidenz: high
Was wir gefunden haben: 91 CSS files without critical CSS extraction
Warum es wichtig ist: Render-blocking CSS delays first paint. Inlining critical CSS eliminates the render-blocking round trip — the biggest FCP improvement for CSS-heavy sites.
Warum es wichtig ist: Third-party connections require DNS lookup, TCP handshake, and TLS negotiation. Preconnect performs these in parallel with HTML parsing, saving 100-300ms per origin.
So beheben: Add <link rel='preconnect'> for key third-party domains: cdnjs.cloudflare.com, www.googletagmanager.com, t.contentsquare.net. Preconnect saves 100-300ms per domain by starting DNS+TCP+TLS early.
Nachweis: PSI-lab · Konfidenz: high
Was wir gefunden haben: 4 external domains without preconnect
Warum es wichtig ist: Third-party connections require DNS lookup, TCP handshake, and TLS negotiation. Preconnect performs these in parallel with HTML parsing, saving 100-300ms per origin.
So beheben: Re-run the scan, or test directly at PageSpeed Insights. This metric needs a successful Lighthouse lab run.
Nachweis: PSI-lab · Konfidenz: high
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| Kategória | Skóre | Váha | Chyby | Upozornenia | OK |
|---|---|---|---|---|---|
| Performance | 70/100 | 25% | 2 | 7 | 8 |
| SEO | 78/100 | 20% | 2 | 8 | 14 |
| Security | 65/100 | 15% | 2 | 9 | 6 |
| Mobile | 61/100 | 10% | 1 | 8 | 7 |
| AI Readiness | 63/100 | 10% | 4 | 16 | 11 |
| GDPR | 89/100 | 10% | 0 | 3 | 9 |
| Vulnerability | 55/100 | 10% | 5 | 7 | 8 |
Plnú interaktívnu verziu s klikateľnými odkazmi a možnosťou opätovného skenu nájdete tu:
https://score.zulien.sk/r/metronet.sk