The system monitor apparently does not show all processes.
I had very high cpu utilization (100%) shown on the graph.
But looking at processes, there is no process that show high utilization.
I start >top (another performance tool).
It shows in my case that NetworkManager is using around 90% of CPU.
I kill NetworkManager, the system monitor CPU load graph goes down to 5-10%.
I happy.
-cheers

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System Monitor not showing correct CPU usage
https://bugs.launchpad.net/bugs/206479
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