Even with the lowest graphic settings, the fps rate is very low (< 10 fps) on my MacBook Pro (Mac OS X 10.6.8, double 2.53 GHz intel 2 duo, 4 GB RAM, NVIDIA GeForce 9400M with 256 MB RAM).
The point is, at the same time, CPU usage is very low as well (< 10%), while other games are usually overheating my Mac.
It looks like Perpetuum is too shy on using the available CPU...
Cheers