emwhy
Are you sure you don't mean "Thread Scheduling Model" under Preferences/Audio/Configuration File? It should be set to "2" for multi core CPUs, Sonar sets it to 1 by default.
Yes, that's about it. MMCSST thread priority is set to 2 in my case for my CPU.
I set the Enable set thread ideal processor to false.
Sorry, I forgot to put how I fixed it... I thought I had...