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.

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https://bugs.launchpad.net/bugs/93847

Title:
  Excessive CPU usage by Gnome System Monitor

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