Just downloaded and ran the demo on the Pavia battle as the Holies.

System: Winxp sp2, AMD Athlon 64x2 Dual Core processor 4200+, 1.0Gig ram, GeForce 7800GT.

All settings to highest.

I noticed nothing I'd complain about as far as lag goes but was playing with few units. For larger battles, I can see maybe needing to turn down to medium on some things.

I also had everything set to best quality on my vid card. Monitor is 19" flat screen and res was set to highest pick in the game setting which I belive was 1280 x 1024.