This is the best image and web optimization service I have ever used, and I tried them ALL.
The plugin does many things automatically and it is very user-friendly, unlike other plugins that bombard you with loads of options to tick and choose from.
The feature I LOVE the most is included in their SWIS plugin is that you get to disable some features of the theme/plugins on specific pages, or sitewide. I thought that no plugin can do that, and it is only done by hiring a developer to review the code. But with SWIS plugin I did it in like 5 minutes.
My website (I use a heavy theme and quite a few plugins) speed went down from 17-24 seconds to 3-5 seconds. I bought Tier 1 and I guess it is enough for 1 or 2 websites since you get 200 GB bandwidth. I wish I can afford Tier 2 to add my other websites to the account.
Thank you EWWW team, and keep up the good work :)