Comments Avatar Lazyload at server side load replace the src property of img tag. It is relly lazyload. It was successfully checked by W3C.
You can find, download and install Comments Avatar Lazyload directly from the Plugins section in WordPress.
If you want to install manually, download and unzip the
comments-avatar-lazyload file and upload to the
/wp-content/plugins/comments-avatar-lazyload/ directory. Then activate the plugin through the Plugins section in WordPress.