One of Google PageSpeed Insights performance suggestions is to defer offscreen images in WordPress with lazy loading.

Lazy loading images in WordPress lowers the initial load time and page payload, without sacrificing content. Lazy loading improves your visitor’s experience, by serving only what your visitors need when they need it. It’s way more efficient than the load-all-the-images-just-in-case approach that results in a slow loading image traffic jam.

In this post, I’m going to show you how lazy loading can improve page performance and how it works. Then we’ll look at how to lazy load your images in WordPress.

What is Lazy Loading?

Read the entire post on WPMU Dev's site