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73416ba
(Get the code!)
FWIW, on my (6-year-old) desktop under 14.04 LTS running on an "Intel® Core™2 Duo CPU E7200 @ 2.53GHz × 2" System Monitor still takes around 20-30% CPU time (I checked both g-s-m and top).
I have two bits of useful debugging info:
First, if I change the update interval to 3s CPU usage in g-s-m stays around 8%. At around 6s it falls to 1%.
Leaving the update interval at its fastest (1s), if the Processes tab is selected but I remove all columns from view (no processes are actually shown), the cpu usage of 20-30% is still there. But if I move to the Resources tab CPU usage goes down significantly, to <5% consistently, yielding instead to 5-20% CPU utilization in Xorg depending on how big the window is. Since the only thing left showing the Processes tab is the average load for 1,5,15 min I'm wondering if it somehow has to do with that, or if g-s-m is doing extra work on this tab that it isn't doing on others.