The frame rates are really bad. This is one thing that Apple does well. They don't release products like that. I am sure the devs at MS already know of these issues and hopefully will release a fix soon.
And that's one thing I find so baffling about Microsoft. They know this and yet still release unfinished, also-ran products time and time again. I want them to be successful but they keep drinking their own Kool-Aid and ignoring the obvious issues with their software and devices.