Convergence and performance of a gravitational dynamics model and a stellar evolution one, coupled at a constant timescale. The top panels and the bottom left panel show three views of the median position error, coupling timescale, and wall-clock run-time as functions of each other. The bottom right panel shows the time evolution of the median position error in all runs. The dashed black lines in the top left plot show linear and quadratic scalings of the error with the timescale.