I normally play through a poweramp and guitar cabs with cab sims bypassed, but I am working on my poweramp (waiting for quieter fan replacement to arrive) so I decided to go direct and use cab sims. I notice that the cab sims increase CPU usage and if the usage gets to around 94-95% the AXE LCD interface becomes very sluggish. It makes it hard to tweak the settings when this happens. Seems like the last time I used cab sims it did this. Is this normal with high CPU usage? I only use one cab block and it is either mono hires or stereo. Some presets are worse than others, but the one I checked showed CPU at 94 and 95%. Please advise.