Google Page Speed-Like Image Optimization
My website has about 20 thousand product images. Google Page Speed tells me they can be optimized, and it's correct - the difference is huge. Google is able to maintain identical quality and reduce the image size by 70-90%, and Page Speed even optimizes them for me and provides me with a link to the optimized image. This would be great if I only had a few images, but I can't manually update 20k images. I don't want to make any programmatic changes to handle optimization, I'd rather just run all of my images through a piece of software that can optimize them and replace the existing images. I would greatly appreciate it if someone who has been through this before can recommend a good program that can accomplish a job of this size while still maintaining quality. Thanks.
Answer
If you're using a Mac I'd recommend http://imageoptim.com since you just drag and drop the files. It saves the files in its original location. For Windows on Adobe AIR some people seem to like Shrink O'Matic - http://toki-woki.net/p/Shrink-O-Matic/