Lazy Loading.
Learn what Lazy Loading means in modern search and SEO.
A technique that defers the loading of non-critical resources—images, videos, iframes—until they are about to enter the viewport.
Lazy loading delays the fetching of offscreen resources until a user scrolls close to them. By loading only what is immediately visible, pages reduce initial payload size and improve Time to Interactive (TTI) and Largest Contentful Paint (LCP) scores.
Implementing Lazy Loading
The HTML `loading='lazy'` attribute on `<img>` and `<iframe>` elements enables native browser lazy loading with no JavaScript required. For more complex cases, the Intersection Observer API allows fine-grained control over when elements load.
SEO Considerations
Images that are lazy-loaded must still have descriptive `alt` attributes, proper file names, and be accessible to Googlebot during rendering. Avoid lazy-loading above-the-fold images—those should load eagerly to protect LCP scores.
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