Hi Skol, I'll try to answer your questions. One thing I realise is I don't know which version of brokers you are using, 5.0, 5.1, or 6.0, and what service level you are at.
Mqsicreatebar is actually Eclipse running the bar editor in "headless" mode. One reason Mqsicreatebar takes lots of CPU is because it needs to start a largish portion of Eclipse when it starts up.