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Really nice tool, but I'm not getting the best results in terms of size optimization so far: http://i.imgur.com/2lfx3P8.png

I guess "highly optimized" is a rather ambiguous term. Maybe add a slider for quality <------> compression?

Progressive jpgs increase the size

For anyone else who also didn't know what progressive jpegs are - https://www.wired.com/2013/01/the-return-of-the-progressive-...

When I was experimenting with PS a few years ago, progressive JPEGs were always larger than baseline which is why I came to that conclusion.

This isn't however the full picture. To keep it short, baseline JPEGs are usually smaller if the file size is less than 10 KB.