marynixie

This plugin generates Featured Image for all posts at once.
It is based on WordPres 2.9+ feature – Post Thumbnails. This plugin takes the first image (by default) from post body and assignes it as a post Featured Image. It helps if your theme supports post thumbnails feature and you want to assign Featured Image for all your existing posts.
Plugin performs mass manipulation on posts Featured Image property and uploads files if they are stored externally. Don’t forget to backup your files and database before using this plugin.
It displays log of success/fails. There is also a feature to remove all Featured Images from all posts – this only changes post setting, no actual files are removed.
Related Links:
<ul>
<li><a href="http://wordpress.shaldybina.com/plugins/generate-post-thumbnails/" title="Generate Post Thumbnails Plugin for WordPress" rel="nofollow ugc">Plugin Homepage</a></li>
</ul>

Generate Post Thumbnails

Tool for mass generation of Wordpress posts thumbnails using the post images.

Jumedeen khan

Mozedia

Lazy Load for Images plugin make lazy load WordPress Images with less then 2kb small pure javascript code, no need jQuerry.
It’s help to increase performance of your website and make it fast loading and improve your website SEO rankins.
This plugin make lazy load of all type images like thumbnail, post content images, avatars, gravatars, widget images .etc.
All images load only when users scroll down and they are on viewport. It’s SEO and user friendly, working well with all browsers.
This plugin is structured very simple and does not need any settings. Activate it, Done!
<blockquote>
<h4>Lazy Load for Images – Features & Advantages</h4>
<ul>
<li>Load images only when required.</li>
<li>Improve page loading speed.</li>
<li>Reduce no. of HTTP requests.</li>
<li>Lazy load also working on mobiles.</li>
<li>Plugin used pure JS, no need of jQuery.</li>
<li>Plugin used less than 2kb Javascript.</li>
<li>Also support Gravatar.</li>
<li>Also support Genesis Framework.</li>
<li>SEO friendly (search engine optimized).</li>
<li>Worked great with genesis framework.</li>
<li>No need configurations (Just activate it, It’s Done!)</li>
<li>Of course, available on <a href="https://github.com/jumedeenkhan/lazy-load-for-images" rel="nofollow ugc">GitHub</a></li>
</ul>
</blockquote>
Simply install the plugin to enjoy a faster website. No options are available : you install it and the plugin takes care of everything.

Lazy Load for Images

A must-have for the fastest page load time, save bandwidth cost. Just install and activate and your site is ready to load with Rocket speed. Awesome work, Highly recommended! 

💯 Excellent plugin, Improves Page Load time Instantly ⚡

Lazy Load WordPress images with a small javascript. Load images only after scrolling down and when viewport and improve page speed and SEO rankings.

Generate Post Thumbnails vs Lazy Load for Images