Great Plugin! Thank you.
There are a couple things I think myself and other users of the plugin could benefit from.
1. The ability to set batch amounts to limit timeouts on the server and continue from the last optimized image.
2. Maybe a list view of all images when you can see what has been optimized and use a simple click to optimize each image. Think all images in list view with check box for bulk optimization.
The reason I mention both of these thoughts is because I am not optimizing a site as an afterthought and felt it would be nice to have more granular control over the optimization process. I have 850+ images to optimize and I receive timeouts fairly often due to the sheer amount of images and variants involved for each one.
If I can be of any help for the plugin development or testing feel free to give a shout.