This is something to give the devs a aiming point at tracking finding and eliminating this bug. The reverb must have some loop (infinite) that is running down the processors on the sound cards.
I have a 1995 Audigy gamer (very first one) in my machine (yes its still working >< and never had an issue.
Turn reverb on and FPS drops to 0-3 fps.
So Stardock devs !! comment on this and seek this bug out