what are you're scheduling settings

i have this problem were max skips a note-on or off from time to time. it seems to be solved if i put the "scheduler in audio interrupt on. but in this article https://cycling74.com/story/2005/5/2/133649/9742 they say: "If using SIAI, the scheduler and audio processing share the same thread, and therefore may not be as good at exploiting multi-processor resources." so is it that bad that now i turned SIAI on i won't make advantage of both mu cpu cores?
i'm curious and i think it's interesting what scheduler settings you use and why exactly?