I don't get you guys. I play mine with an official 1MB RAM cartridge and the game is fast as hell. I've seen in Saturn Power that the specific game doesn't support 4MB RAM cart but only 1MB. Yeah I know that it's kinda odd but that was written.
I thought the Saturn version of MSH was really good, and accurate as a conversion because the coin-op wasn't blindingly fast. Either way it's vastly superior conversion, even without the cart than the piss-poor PSX port.