Hi @joej, "speed" is just distance/time ... so that, in its most basic sense, is two properties of a tween on an object and can be represented by something like   obj = '#someObject'; time = 1; distance = {x: 500}; TweenMax.to( obj, time, distance );   See the Pen KepvRV by sgorneau (@sgorneau) on CodePen     Another aspect of z-depth is scale. Things close are larger and move faster, things farther away are smaller and move slower.