Lazy Loading
Lazy loading defers the loading of non-critical resources, usually images and iframes, until they are about to enter the viewport. This reduces initial page weight and speeds up first paint.
Why It Matters
It cuts the bytes needed to render the top of the page, improving load time and Core Web Vitals on image-heavy pages. Faster initial load lowers bounce and protects ad Quality Score.
Common Mistake
Lazy-loading the hero image or above-the-fold content. Deferring what the user sees first delays Largest Contentful Paint and makes the page feel slower, the opposite of the intent.