Part of the simulation time used for the STELLAR_WIND.PY code while creating new particles (circles) and accelerating them (stars) compared to the time used by the SPH code (diagonal lines). The three panels show results for simulations with the simple wind mode (top), the accelerating wind mode with the logistic acceleration function without a critical timestep (middle) and the accelerating wind mode with a critical time step (bottom). Marks along each line denote separate simulation runs. At the top axis we give an estimate of the number of SPH particles (N) actually used in the simulation with the corresponding particle mass (M_SPH). The remaining simulation time (white space) was mostly spent on unoptimized administrative tasks like saving snapshots and removing escaping particles.