If you run the bare minimum of leagues you should be able to get away with about 500mhz and 128mb ram (maybe 64).
Generally though it's very slow. When I did play it I ran it on a 1.7ghz 256 mb ram PC with about three leagues and it was still mind numbingly slow (that coupled with the crashes and the bugs and that the game is actually worse than CM 01/02 lead to me not bothering with the bloody thing anymore).
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