I discovered some more:

- It is definitely caused by graphs (as Spudz  wrote on 2008-11-12).
- Resource consumption doesn't depend only on graph update interval, but also 
on graph size if I unmaximize the System monitor window (to size 550x412 px - 
lowest possible) graphs are smoothly running (without lags and with 90-100% CPU 
usage on one core) even if I let it run for 60+ sec=whole interval is used for 
graph. In maximized window (size 1647x1000 px) graphs start to lag after 20 or 
22 sec with 100% CPU usage on one core. Update interval was 1 sec in both cases.
- If I use update interval of 5 or 10 sec overall CPU usage gets lower but on 
System Monitor panel applet I can see that there are still spikes utilising 
40-50% of one CPU core=It still uses too much resources, especially considered 
that between the spikes CPU usage is 20-30%. Also graphs updated in 10 sec 
intervals are not so useful, but it seem to me that it is somehow interpolating 
the values for graphs between 10sec updates or the update interval is is 
incorrect (as snibgo  wrote on 2010-02-20) - 12 or 13 sec caused graph to move 
approx. each 1 sec.

I hope this helps developers with debugging.

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