Felix Arntz, WordPress core committer and developer programs engineer at Google, announced a plan to push a lazy loading feature to the platform. If testing goes well, this feature could land in WordPress 5.4 in March.
The concept of lazy loading allows a webpage to render without loading certain resources until they are needed. This leads to faster page loads and saves data on the visitor’s end. Lazy loading is particularly useful when rendering images on the web.
The opposite of lazy loading is called eager loading, which loads everything in bulk. By default, this is how all images are loaded on the web. This often leads to poor performance on image-heavy webpages where many of the images are not in the site visitor’s viewport when first viewing the page.