Is it my impression, or MIRA4 is not using multiple threads? Although I have indicated not=12 in the manifest file, MIRA4 seems to be using all the time only one: I have two different assemblies running: [image: Inline image 2] I am basically using the same manifest as for MIRA4rc05, with the same dataset, and MIRA4 it takes way longer to finish than 4rc05. Cheers, Juan