If you use Project64 as long as it's version 1.6 you can just disable that Emulate/Simulate AI option in the config for that plug-in. In most games, you don't hear a difference, but there are cases where audio sounds better with the option off.
Switching from Jabo's DirectSound to Azimer's plug-ins should not be causing newly slow speeds, except for some games. Check again if you have that effect with the original plug-ins.
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