Excessive resource usage by Xorg

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http://unix.stackexchange.com – I'm using Debian (testing) on a Laptop, I have installed Nvidia drivers and I'm using my laptop connected with an external monitor. As desktop enviroment i'm using Xfce4. My problem is that Xorg seems to me to use to much resource: if i scroll a web page it takes 30/40% of CPU, and also the Nvidia card has to work at the max frequency. Maybe i have some bad configurations, but I don't known how to check. What can I do? Thank. (HowTos)