Look at the those peaks in the first graph, which factor can cause this?
cpu 24X6
high load low cpu low iowait, why?
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There's a lot of stuff going on in any general purpose computer. When I performance profiled apps in a former life, I saw this all the time and factored it out.
It's caused by a whole host of sources: Processor dealing with interrupts, some disk maintenance routine, file system clean up, completely useless background apps that have been installed unknown to you as automatically launched services, etc.
Your plot of idle time is a little disconcerting. It is awfully low. What apps do you have running taking up all that processing? Also, if your memory is low, say because you have 20 or 30 browser tabs/windows open, your CPU load will go through the roof due to all that page and context swapping.