At 09:11 PM 24/09/2011, SET wrote:

>I've never used classic at all, so what I write here may not be correct! If you have two processors and have set the CPU affinity to use just one of them (the benefit with classic would normally be that you can use several processors, but maybe it still adheres to what you've set the affinity to be), then 50% CPU means that one of the processors is extremely busy doing something and things may appear to hang.

It's not correct. CpuAffinity applies *only* to Superserver on Windows, including Embedded on Windows for Fb. 2.1.x and below. In all other environments it is ignored.

Nevertheless, you might be onto something re CpuAffinity, if the OP is using Superserver. Maybe it is set to something "unfriendly", perhaps to multiple processors or a number that targets a hyperthreaded "processor".

./hb