The game's frame rate has a tendency to chug when things get really busy on the larger maps, particularly if a few 'Ant's Nest' power-ups have been fired off. We also had a few online matches slow to a crawl, but whether this was due to networking gremlins or a game engine that still needs fine tuning, we don't know. As frenetic as the game gets, it still doesn't seem like it should particularly bother a modern, mid-range PC.
Not that any of these quibbles really matter in light of the solid, addictive gameplay that Multiwinia serves up by the bucket load. It's a stripped down game with some serious muscle - if you're looking for some bare-knuckle RTS action, don't let Multiwinia pass you by.