Pygame - jerky motion

[donn]

Hi- just installed pygame, not sure where to go for some help. 
I am on Fedora 3 running an ATI card but without the GL drivers installed.

When I run any of the examples they work fine but they are very jerky. 
The animation is smooth for a few seconds and then the entire thing pauses
for a heartbeat and then it goes on, pause, move, pause, move etc.
Any ideas about what's up?

(This is the same in fullscreen or running as a window)