Rafal 'Raf256' Maj wrote:
> I'm working in X windows.
> 
Me too...

> What can cause such problems?
> 
...and although frequently using nice values of 15 for POVRay, it 
seems I do not "feel" the problems you do. 
But well, of course, there will always be a small slow down -- after 
all there is a CPU hungry process running. 

You may run top(1) and see how CUP time is divided up among the processes. 
Maybe you could be a bit more explicit about the performance impact. 

Wolfgang

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