Smush Pro is an image optimization plugin that can be bought on its own, as well as is included in WPMU Dev memberships. Image optimization is a must on any WordPress website to boost site speed. Smush Pro builds upon its free plugin's capabilities by adding in Super-Smush mode, support for larger image files, bulk optimization and much more. Plus, it smushes images 200% faster than the free version! If you're looking for the best image optimizer for WordPress, Smush Pro is definitely one to consider.
Included in WPMU Dev membership