Updated to 10.6.8. Did some testing to see if there was any graphics improvement in X-plane. Got exactly the same frmae rate for my system. This doesn't mean that there wasn't improvement, it may mean that for me, the limiting factor was CPU performance. I suspect that most people won't see a change. ( I already get very high FPS with good settings on objects and visibility at 25nm) System specs: Mac Pro, 4 processors, INtel, 3Ghz speed, 4 Gbyte memory. Nvidia GEForce 8800 GT.