I actually did poke around at the app with Instruments for a bit, the other day. As I mentioned above, the vast majority of time spent is in glDrawElementsInstancedBaseVertex_STD_GL3Exec() (and then, deeper, gldRenderTriangles()). I can run it again and give you the full output. Are there any other instruments you'd like me to add as well? Nope, it was a completely standard OS X 10.9.4 system with that fps. I only started playing with drivers because of this very disparity. I currently have an NVidia preferences pane installed that lets me toggle between their drivers and the stock ones – both have similarly abysmal performance.