Warcraft 3 starts to get laggy when too many units are around. This is obvious of course, but what I'd like to know is whether I can do something about it.

My virtual memory setting is already at max (4096megs), so I don't know what else to do. I have a 2.2 ghz processor with a gig of ram, and it's not really doing much (the program ends up using ~300 megs of ram sometimes).

Is there something I can do to make things easier on me?