Hey guys! My development team and I were having a discussion about Hummingbird today. One of our devs installed the plugin on a site, and received the "Do you want to store theme files on WPMU dev’s super fast cdn", message and said yes. After running the Google page speed test, he found the score actually fell. When he disabled it, the score went back up.
I wasn't sure if that info might be helpful for you guys or not, but figured it couldn't hurt to pass it along. Keep up the great work!