I just wanted to put it forward that DP 7 has finally fixed my 750m performance issues in Yosemite. In all previous releases FPS in 3D applications and games would be very poor, but be reported as normal. For example the OpenGL benchmark in CineBench would report 60fps, but would appear very choppy and at a low framerate. This seems to have been fixed now. If I am not the only one to experience this I hope it comes as good news! Cheers.