This depends radically on your options choice. You have to keep in mind that the tree algorithm is fast and the energy algorithm slow. Drawing trees, mixed tree-loop structures with loops up to 3 nodes (or with bigger loops but the "Fast" option also on) will be fast -- less than 1 second for 100,000 nodes -- as no energy optimization is required. When the energy algorithm is used, the computational cost depends on the maximum number of steps allowed (field "Max Nb of Steps") and the number of nodes (about one second for the AntSimulation graph [60 nodes] with Max Nb of Steps = 25,000).