Mmm....I just noticed one thing:

It seems that the Xorg cpu usage became high only when "system monitor"
is open.

when I close it, Xorg cpu usage returns low:

top - 09:04:33 up 31 min,  2 users,  load average: 0.16, 0.55, 0.63
Mem:   2062040k total,   837608k used,  1224432k free,    39880k buffers
Swap:  1992052k total,        0k used,  1992052k free,   410244k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
 7722 root      20   0  902m  35m 9780 S    1  1.8   0:26.68 Xorg               
 5214 messageb  20   0 21644 1520  764 S    1  0.1   0:00.90 dbus-daemon        
 7949 mangus    20   0  241m  36m  13m S    1  1.8   0:05.28 compiz.real        
 8049 mangus    20   0  263m  25m  12m S    1  1.3   0:00.40 gnome-terminal     
 8074 mangus    20   0 18988 1284  932 R    1  0.1   0:00.64 top

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[Hardy] Xorg high CPU usage with 2.6.24 kernel and nvidia-glx
https://bugs.launchpad.net/bugs/178400
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