I have recently done a bit of Unity coding, and what I found very important that I don't have in Greenfoot is an info about the time the last frame took (--> deltaTime in Unity). This allows to have for example a constant movement speed not influenced by the framerate.
I am almost certain that you can, with a bit of coding, get this timestep in Greenfoot too, but I don't know the classes and methods to do that. Maybe someone can help?

