I believe the only prob. with 200 entities is memory use. if that's just a precaution, and the entity level isn't likely to go up to that then you should have no prob. And also, 200 entities isn't to unreasonable. Most of your time is lost in rendering those 200 entitities, which is probably one of the reasons the Tokamak demos are slow. If your game requires physics, then you aren't gonna get much faster without creating a dll in some other lang(C most likely).
tokamak physics thread 2:
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