technical

Lazy loading

Deferring image/iframe loading until visible.

Definition

Lazy loading defers loading of images, iframes, or scripts until they're about to enter the viewport. Use loading="lazy" attribute. Improves initial page load metrics.

Related terms

Core Web Vitals

Google's user experience metrics.

LCP

Largest contentful paint — page load metric.

CLS

Cumulative layout shift — visual stability metric.

INP

Interaction to next paint — responsiveness metric.

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