Thanks for understanding. We are always working on ways to make the frames better on all our new releases. BL2, BLOPS, and Civ V are constantly tweaked for performance, Infinite wont be any different.
Performance is always subjective, but please understand Valkyre that if the MBPr at default settings ran poorly in our tests, we certainly would not have supported it as gamers. We are absolutely hardcore about not supporting hardware sets that aren't up to snuff at default settings. I worry that this is a bug for you specifically, because we are not having any reports of poor performance on that hardware set from users or press yet.
I'm not suggesting your system runs poorly on anything else, every application is completely different, I'm suggesting that its possible something weird is causing your issue (I've seen some crazy stuff). If you'll let support take a look, they might be able to help. Every support agent we have is also a tester, so they run sweeps on issues all the time (especially at launch.)
The jury is certainly still out on Mavericks...but it looks very promising.