The situation you describe only really happens if there is pressure on memory; 
and paging to the pagefile begins. In this case, where high priority processes 
have been paged-out, performance is always going to be terrible. The solution 
is of course more physical memory.

> It may be the scheduler being non-preemptive, or it may not. It may
> be that the cause is the use of virtual. When other processes are idle,
> they get swapped to virtual, and then P95 can run full tilt. When the
> higher priority process actually gets scheduled, it isn't in memory.


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