Best Image Optimization Plugin

This plugin is really awesome. I tried some others, and this one seems to be currently the best image optimization plugins around. Saved about 45% of image size (which is equivalent to a faster loading website). With images I already shrinked and optimized offline before uploading. And one can hardly see any difference in image quality, even with lossy image optimization enabled. Another highlight is the ability to create alternative google image files, which are even smaller.