Hello ! After a feedback from the developers, I finally found the python cmd to control time-scale in the editor . " --time-scale=1 --capture-frame-rate=0 " So after adding this command [mlagents-learn saymyconfig.yaml --time-scale=1 --capture-frame-rate=0 --run-id=saymyid01] the editor time scale sets into 1. Then the models will be trained in the same time scale that the usual built models run in the play mode. If only cmd " --time-scale=1" was called, the editor time scale sets into 1. But realistically float Time.deltatime will stay about 3x time scale.