The European Spallation Source Neutrino Super Beam (ESSνSB) is a proposed neutrino oscillation experiment to be held in Lund and which takes advantage of the ESS linac firstly designed to study spallation neutrons. Here we study the capability of this facility to discover the yet unknown parameters in the neutrino sector, such as the existence of CP violation. We optimize the physics performance as a function of the baseline and running time of the experiment in each polarity and make an in depth study of the impact of particular systematic errors.