No doubt, WordPress CMS is popular because of their plugins repository. There is every type of plugins to do almost anything you want. If you want to create static HTML files, manage mailing lists or integrate social sharing buttons, you have everything for free. There are also many WordPress image enhancer and optimizer plugins to speed your WordPress site’s performance and speed. It is necessary to use one of these WordPress image optimizer plugins too, if your pages are heavily using images to prevent slow loading of the page and for best performance.
WP Smush.it has a beautiful API to reduce image file sizes to improve your site’s performance. This plugin strip the unused colors from indexed images, convert certain GIFs to indexed PNGs, optimize JPEG compression and strip meta data from JPEGs.
PB Responsive Images
PB Responsive Images plugin for WordPress adds support for the proposed responsive image format in post content dynamically. This plugin re-formats all the images in your post content into a format something like responsive images community group.
EWWW Image Optimizer
EWWW Image Optimizer WordPress plugin reduces image sizes within WordPress. The plugin uses gifsicle, pngout, optipng and jpegtran. The plugin also directly works with other plugins including GRAND FLAGallery and NextGEN.
CW Image Optimizer
CW Image Optimizer helps you to optimize hundreds of images in just a few minutes, optimize your images for saving hundreds of KB per image, backup files and faster page loads. This plugin uses Linux image optimization programs.
Imsanity WordPress plugin allows configuration of max width/height and jpg quality. You can also resize existing images with bulk resize feature. Imsanity scales large image uploads to a more “sane” size. The plugin uses WordPress built-in image scaling hooks.
Lazy Load for WordPress is a good plugin to improve server bandwidth and page load time. This plugin loads images only when visible to the user. This plugin utilizes jquery.sonar.
Hammy WordPress plugin works in a different way. This plugin resize and generate images according to content width. There is no external dependency, the plugin just uses WordPress 3.5 image code.