Works great!

With Yosemite’s Preview app not actually compressing images now, I needed a way to do the job. Even if Preview wasn’t broken, I prefer Compress. I gives you a slider and displays what size ithe image will be and shows a preview Before and After. The batch processing works well, you just have to go the Compress folder, then drag the edited image to its desired location.

PilotJimL about Compress