This may be one of those newby questions that only the hopelessly naive would ask, but please be patient with me.
I recently installed a HIPS program called System Safety Monitor. It has the ability, like Process Tamer, to show what processes are running and the percentage of CPU being used by each process.
I was alarmed to see that something called System Idle Process was using between 65 & 85% of the CPU and this was when everything else was ticking over at 1 - 3%. SIP doesn't appear in the PT process list.
Is there really something in my computer using so much of the CPU or do I just not understand something simple which everyone else knows about?