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What are lazy loading images?
Lazy Loading Images is a set of techniques in web and application development that defer the loading of images on a page to a later point in time - when those images are actually needed, instead of loading them up front.
Should I lazy load 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 to lazy load images in JavaScript?
Using the isIntersecting property, you can select the URL from the data-src attribute and shift it to the src attribute so that the browser can load the image when the API determines that the element has entered the viewport. Once this is finished, you can take the observer and the lazy class out of the image.
