Lag with sample programs

Hi
i have a problem with all the sample programs. My fps with the example is stable around 60 but it even lag periodically with 1 second intervals. where the problem come from ? I have tried some games using panda3d and there was no problem. :cry:

my config :

WINDOWS XP SP3 :arrow_right:
INTEL® CORE™2 DUO CPU
E7400 @ 2.80GHz
3.25 GB OF RAM
GPU ATI HD4850 (with latest driver)

FIREWALL : NONE
ANTIVIR : NONE

PANDA3D RELEASE 1.6.2

Have you tried disabling vsync? Search the forums or manual to find out how.

Tanks ! It’s work now. But why it don’t work with vsync ?

Hm, I bet it’s a driver issue.