Dolphin cause X high CPU usage

[Armelius Cameron]

Hello,
I have noticed that Dolphin can cause X process to use a lot of CPU on both my 
laptop and desktop running F12 with latest updates. I tried restarting, login 
to KDE, then just run Dolphin and top. All I need to do is just moving around 
mouse cursor on Dolphin window and I can drive X CPU usage to 40%, and Dolphin 
CPU usage to above 30% on my desktop (Athlon 64 3000 (1.8GHz CPU)). Similar 
thing happens on my laptop (a dual core machine). 

The desktop has NVidia GE Force FX 5500 with Nouveau driver. Laptop has Nvidia 
GeForce GT 220 with proprietary NVidia driver (installed from RPMFusion 
repository).

Is anyone else seeing this ?

Thanks.
AC