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I have also had this problem..

XP SP1 P4 30.Ghz 1024ram etc

when started, zmatrix uses the proper amount of cpu power.
However, whenever i watch a video, or open my TV Tuner
program, zmatrix automatically sets it's priority to high, and
stays there until i restart the app. I have a feeling it has
something to do with the fact that both zmatrix and most
video players use an overlay layer. fix it fix it fix it fix it fix it
fix it fix it