On Google’s podcast, Martin Splitt explains how default lazy loading can delay LCP, why some libraries hinder indexing, and ...

Lazy-loading The lazy-loading HTML attribute tells a browser to either wait before downloading an image or to download it right away. There is no JavaScript need to accomplish this.

Future versions of Google Chrome will feature built-in support for lazy loading, a mechanism to defer the loading of images and iframes if they are not visible on the user's screen at load time.

Traditionally, developers would add lazy loading to a web site through third-party JavaScript libraries, but with the release of Chrome 76, Google has added it as a native feature to the browser.