Well, I've just tested the Mac OS port of Elite Dangerous. My RiMac is the maxed out version.
To resume things quickly, on bootcamp :
- 60 FPS in space but could be 40 in crowded area, 40 in station, 40/45 in asteroid field with a little bit of stutter. Everything on high, 2560*1440, Vsync activated but no AA.
On Mac OS X :
- 60 FPS ++++ in space, 55/58 in station, a solid 60 in asteroid fields with absolutely no stutter at all. Everything on high, 2560*1440, AA and Vsync activated.
Frontier has done a really great job. It was already very nice to play Elite on a Retina iMac but it is now even better.