I had this problem with my sound for the longest time. Severe stuttering and freezing due to multiple sounds (planes, explosions) in SH3 & 4. I just had to put up with it but finding someone else may have the same problem got me thinking about it again.
I think I may have found a solution. My onboard sound shares an IRQ with the USB controllers. I just disabled "legacy USB support" in BIOS, and it seems to be perfectly smooth now! It's something to try, although no guarantees since I don't know if it's the same problem as you have, and I haven't had time to test it beyond a few training missions.
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