iMac 27, mid 2010
i7 2.93 Ghz
12 GB 1333 Mhz DDR3
Ati Radeon 5750 1024 MB
Lion 10.7.5
Getting between 30-60 fps with autodetected settings in 2560×1440 fullscreen. For me, the char textures are better than the Windows version, more detailed and colorfull.