Hello Folks,

I am having a performance problem.

The application I'm working on was fine until I put a timer to call
update() of QLabel every 300ms.

Every time I run my application the initial CPU usage of it is about
60% - 70% and Xorg CPU usage is about 20% - 30% but that is normal.
When the timer starts to call update of QLabel, the Xorg CPU usage
starts increasing and reach almost 100% of CPU in 10 minutes and the
CPU usage of my application falls to 4% - 5%. That happens when I use
default graphics system (that would be the native??). When I run my
app using "-graphicssystem raster" the problem disapears. Using
"-graphicssystem opengl" crashes the system.

OS : Ubuntu 9.04 (linux kernel 2.6.28-15-generic)
Qt: 4.6.2
X.Org X Server: 1.6.0
GPU: GeForce 7300 SE/7200 GS
NVIDIA Driver Version: 180.44

I need to know what is going on here. Any help will be appreciated.

Regards,
Eduardo Luz