When modeling the dynamics of galaxies,several numerical techniques can be applied.Most useful are the direct N-body codes,tree codes and particle-mesh codes.All of these codes have a different scale of resolution and a range of galactic scale applications.Here,we present a radically updated new version of SUPERBOX that allows to us reach a much better numerical resolution using a larger number of particles.A comparison was made with the very popular publicly available tree-gpu code(BONSAI).In our research,we are aiming to demonstrate that the new parallel version of SUPERBOX is capable to do the high resolution simulations of the interaction of a disc-bulge-halo galaxy with an in-falling satellite galaxy.The improved code is applied to investigate disc heating by the in-fall of a galaxy satellite.We describe the improvement and communicate our results.As an important application we discuss the disruption of a dwarf galaxy within a disc-bulge-halo galaxy that consists up to 107 particles.