Why pictures are lazy loading?
Why go for lazy loading images at all? Lazy Loading defers the loading of an image that is not needed on the page immediately. An image, not visible to the user when the page loads, is loaded later when the user scrolls and the image actually becomes visible.
Should I lazy load all images?
You should always use lazy loading for the images below the fold. As we explained, lazy loading will reduce the real and perceived loading time. User experience will benefit from it — and you users will thank you.
How do I lazy load offscreen photos?
With browser lazy loading, you only need to add a loading attribute with a value of lazy to the img tag in the HTML markup. Put simply, all you need to do is tell the browser which images to lazy load. No JavaScript, APIs, or calculations required.