TL;DR
Lazy loading is a pattern that defers the loading of non-critical resources, typically below-the-fold images, iframes, and JavaScript modules, until they are about to enter the viewport or are explicitly requested.
What is Lazy Loading?
Lazy loading is a pattern that defers the loading of non-critical resources, typically below-the-fold images, iframes, and JavaScript modules, until they are about to enter the viewport or are explicitly requested.
Learn more in our how to improve lazy loading guide, or work with us through our done-for-you speed optimization service.
How Lazy Loading is Measured
Native lazy loading is enabled with the loading="lazy" attribute on <img> and <iframe>, and is auditable in PageSpeed Insights.