The OS takes 30 percent of the processing power with a game running? That's crazy if true. It would show how silly the whole idea of "one OS everywhere" really is. It would be much better to have a more stripped down OS that just does the basics and gets you inside a game, and then gets out of the way, instead.
But this shows once again the conflictual nature of Microsoft's two strategies with the Xbox One. It's like the gaming part is more of an afterthought, and what they really want is for Xbox to become everyone's streaming box - a $400 streaming box.
This notion of "one OS everywhere" is what we'll get us a Windows 8 smartwatch with 2GB of RAM and a Celeron processor - because who wouldn't want that?!