By chance do you have an Nvidia graphics card.  My test machine was
doing the same thing.  gnome-system-monitor using high 90% switching to
resources tab would spike it to 100%.  I did not have the nvidia drivers
enabled. Once I enabled them and rebooted my system has stabilized.....
gnome-system-monitor currently running around 5-8%.

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Excessive CPU usage by Gnome System Monitor 
https://bugs.launchpad.net/bugs/93847
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