Why does the actual CPU usage seem to be double what is reported for active processes?

by rudivonstaden   Last Updated August 10, 2018 12:00 PM

My CPU shows heavy utilisation in Resource Monitor, but if I select all processes, the combined CPU usage of all active processes comes to roughly (exactly?) half of total CPU usage (orange line in the graph below). Why does the actual usage seem to be double what is reported?

graph of cpu usage

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