I've ran into this issue multiple times and am only now creating a bug for it. Any time I reach for SmoothedAnimation or SpringAnimation to create a nice "smoothed animation" effect for a property I am always left disappointed by the quality of the effect for both effect types.

SmoothedAnimation has jerky and inconsistent movement where it often "jumps", especially if the direction changes. Where as SpringAnimation continuously stops transitioning as the target value updates making it a unsuitable alternative.

See attached Main.qml file for the code for the above gif.