litefeel

Comments Avatar Lazyload at server side load replace the src property of img tag. It is relly lazyload. It was successfully checked by W3C. 
It is only lazyload comments avatar.
Related Links:
<ul>
<li><a href="https://www.litefeel.com/comments-avatar-lazyload/" title="Comments Avatar Lazyload Plugin for WordPress" rel="nofollow ugc">Plugin Homepage</a></li>
<li><a href="https://www.litefeel.com/" title="Author For Comments Avatar Lazyload Plugin" rel="nofollow ugc">Author Homepage</a></li>
<li><a href="https://github.com/lite3/comments-avatar-lazyload" title="On GitHub" rel="nofollow ugc">On GitHub</a></li>
</ul>

Comments Avatar Lazyload

Comments Avatar Lazyload at server side load replace the src property of img tag. It is relly lazyload. It was successfully checked by W3C.

Mario Peshev

DevriX

Lachezar Gadzhev

DX Webp Picture Tag Image Wrapper filters the content and replaces the img tags with picture tags by adding two sources – one with the image followed by .webp extension 
and one with the original image.
The plugin supports jpg, jpeg and png formats
Your site needs to support Webp images
DX Webp Picture Tag Image Wrapper resolves the issue with Accept header on Safari that doesn’t include the webp format. Using the picture tag 
allows the browser to render Webp images, if they are supported, without relying on that header

DX Webp Picture Tag Image Wrapper

Automatically wraps content images in picture tag by making one of the sources webp. It supports Gutenberg content

Comments Avatar Lazyload vs DX Webp Picture Tag Image Wrapper