I don't actually get processor overload by the way. Just crackle and pop. And snap, I guess.
Both my systems are at maximum performance, power management wise. I'm not using ridiculously low latencies/buffers either. My laptop is an i7 quad core, not the very latest but definitely no slouch. My desktop is a 3rd gen i7 quad core. No other DAW (including earlier Sonars) produces this behavior at ANY latency I can set my system to. My desktop's card goes down to 2 milliseconds and it's fine, even in Sonar X3. Just not with BlueTubes or BReverb.