Abit too outstanding. Warhammer ran decent until the battles got huge, this runs like ass without even having more than like 5 troops on the screen. Nothing lowering the graphics can't do though then it isn't as atomsphereic. Either way.
You must not have your machine set up right. I can take Dawn of War on maximum video settings at the end-game fights with sixty assault terminators on-screen, fifty hellfire dreadnaughts, and thousands of orks all battling it out onscreen all at once.
It does slow down imperceptibly, but nothing that is really bothersome.