Slackware :: X Server Taking Always 4-7% Of The CPU?

I got a new-old notebook from ebay, a sony vaio vgn-tt11. it is working really great with slackware and I can recommend it to everyone whose thinkpad got stolen ;-)I am trying to optimize everything I can and one thing is bothering me although I might be wrong about this. "top" is showing X server taking between 4-7% of the cpu even when I am not doing anything (no apps with running in the background). I remember that x server on the thinkpad did use much less cpu. but I checked that on thinkpad at least two years ago.

4-7% is (not) much and I would like to hear whether your X server is taking any cpu power and how much. do you have any ideas how to improve this or is this something I have to live with? I am using vanilla slackware 13.1, gnome slackbuild and kernel 2.6.38. I tried playing with Xorg.conf but it did not help at all. I activated "composite" extension through xorg.conf but nothing changed.

Code:
# lspci | grep -iE '(vga|display)'
00:02.0 VGA compatible controller: Intel corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)