ProTracker modules wouldn't help unless you only use two channels, but then you might as well stream the original music as one long sample, which is the current fallback. All of the music options (CAMD, MHI, plain old samples) have negligible performance impact compared to pretty much everything else in the game.
The area that could use some improvement is the sound mixer itself, but for now I did everything I can. Try turning off the sounds vs turning off the music only in SW, and you'll see what I mean.
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