Crowd:
60 Frames per sec, both in window and fullscreen

Terrain:
Average 70 Frames per sec, 60 in fullscreen mode

Specs:

intel Dual Core (E8400) @ 3.0 GHz
NVidia Geforce 9800 GTX+ w/ 512 mb RAM
4 GB RAM there, 3.5 running because of 32 bit.