Real-Time Measurement and Control

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Changing parameter "ESys.StdNParallel" from 1 to 0 in "ni-rt.ini" improves execution in cRIO

I'm running several processes in parallell on a cRIO 9004. I have noticed that execution speed increases with a factor of 10 when I change the parameter "ESys.StdNParallell" in "NI-RT.ini"-file from "1" to "0". Why does my program run faster with single threading enabled and whats the drawback it?
 
Regards
//Ulf
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