.timeScale()

Factor that’s used to scale time in the animation where 1 = normal speed (the default), 0.5 = half speed, 2 = double speed, -1 = go backwards at normal speed, etc. For example, if an animation’s duration is 2 but its timeScale is 0.5, it will take 4 seconds to finish. If you nest that animation in a timeline whose timeScale is 0.5 as well, it would take 8 seconds to finish. You can even tween the timeScale to gradually slow it down or speed it up.

This method serves as both a getter and setter. Omitting the parameter returns the current value (getter), whereas defining the parameter sets the value (setter) and returns the instance itself for easier chaining, like myAnimation.timeScale(2).play(1);

var currentTimeScale = myAnimation.timeScale(); //gets current timeScale
myAnimation.timeScale( 0.5 ); //sets timeScale to half-speed