All the IREM games of that period run the IREM discrete sound board code because it's used for drums on Kid Niki, Horizon, Spelunker etc.
This includes Kung Fu Master, although I'm not sure it actually uses the discrete drums at all (we probably need to check if that hardware exists on that PCB)
Emulating the discrete components is VERY slow, hence the slowdown you're observing.
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Re: Kung-Fu Master - MAME 0.163
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