Thank you very much for the answer cedric. As I understood from your answer, the type of algorithm implementation is important. Please advise how can I enable multiple threads in general? I saw a typichttps://forum.orfeo-toolbox.org/t/is-otbcli-trainvectorclassifier-supporting-multi-core-processing/112 that openmp should be enabled to use all system cores, but I did not understand how to enable it for Windows and mapla. Is it possible at all?