With this recent addition(https://webspeedtest.cloudinary.com) to tools you can use, Cloudinary(http://cloudinary.com) is hands down the best for me, In all the time I've been using it, It usually has a way of meeting all my needs. I'm obsessed with page speeds and Optimization, like I have sleepless nights optimizing, but since using Cloudinary, I can sleep well on some nights now. And No! I don't work there, but bless the people that work there.