Once you really get going with the volume of units - especially over a network - the loads on the system can get heavy. Basically, you get carried away having too much fun building some absurd army.

I haven't really run into that recently... Though I imagine pretty much any x86 system made in the last 20 years or so should handle it fine. I remember getting to that point on my old PIII-powered Optiplex GX1, that was a fun time. Trying to build nukes, an army of assault kbots/vehicles, bombers, and construction bots, and trying to guide what remains of your previous armada to where you think the enemy is because they took out your long range radar units...

I do have the CDs in storage somewhere, too, I should dig those out and see if they play nice.