Reply to Multicore Processor Support - on or off?

Ok, so when using other app i've noticed a bit of audio drop out on 2.5

So i've turned on muticore processor support and it seems much better...

I can't find anything in the manual about it though, or online really. Just vague stuff on traktor bible saying have it on or off if you want...

Surely, in theory, should have it on with a MBP right?