RESOLVE: Playback issues on Retina MBP 15in

Hi, since 9.0.4 (now on 9.1.1 full) I have major playback issues on the Retina MBP. I have ML 10.8.2, 5.0.36 Cuda drivers, just did a fresh install of Mountain Lion. I get some very poor playback. Barely playing 24fps and dropping to 22 every few seconds without any nodes.

Anybody else has this issue? Any clue?

Also, automaticly, when launching Resolve, it uses 129% of CPU on a ProRes 422 file idling (no playback) and no grade. It doesn't seem right. On the iMac it only takes 20% on idle.