Performance Best Practice

Lazy Loading Beispiel

Hier siehst du 100 hochauflösende Bilder auf einer Seite. Ohne Lazy Loading würde dein Browser versuchen, alle ~100MB sofort zu laden – die Seite wäre langsam und unbenutzbar.

Dank loading="lazy" lädt der Browser (und Google) nur das, was du gerade siehst. Scrolle nach unten und beobachte den Netzwerk-Tab!

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Das Ergebnis?

Trotz hunderter Bilder lädt diese Seite blitzschnell. Das ist die Power von modernem Web-Development.

06. FAQ

Was ist Lazy Loading?
Lazy Loading (faules Laden) ist eine Technik, bei der Bilder, Videos oder iframes erst dann geladen werden, wenn sie im Sichtfeld des Nutzers (Viewport) auftauchen. Das spart Datenvolumen und beschleunigt die initiale Ladezeit der Seite enorm.
Warum ist Lazy Loading wichtig für SEO?
Google nutzt die Ladezeit (Core Web Vitals) als Ranking-Faktor. Da Bilder oft den größten Teil der Dateigröße ausmachen, verbessert Lazy Loading den LCP (Largest Contentful Paint) und sorgt für bessere Platzierungen.
Wie implementiere ich natives Lazy Loading?
Moderne Browser unterstützen das Attribut loading='lazy' im img-Tag. Es ist kein JavaScript mehr nötig. Beispiel: <img src='bild.jpg' loading='lazy' alt='...'>.
Funktioniert das in allen Browsern?
Ja, alle modernen Browser (Chrome, Firefox, Safari, Edge) unterstützen das native loading-Attribut. Für sehr alte Browser werden die Bilder einfach sofort geladen (Graceful Degradation).
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