Websitedesignernc

Some WordPress plugins will load jQuery into your header through the wp_head function, but at times it is not wanted. For example, you may load jQuery through Google, in which case, you will not want any of your plugins to load it. You can use this plugin rather than commenting out the code for every plugin or putting a function into each theme.

Do Not Load jQuery

Stops WordPress plugins from loading jQuery.

calmgracian

Devrama Image Lazyload loads images in the content of your post as you scroll down. It makes the page load faster and reduce server traffic. 
Here, you can check how it load images in the page. 
http://devrama.com/static/devrama-lazyload/example-document.php

Devrama Image Lazyload

Devrama Image Lazyload loads images in the content of your post as you scroll down. It makes the page load faster and reduce server traffic.

Do Not Load jQuery vs Devrama Image Lazyload