The "snapping back" is not the jumpiness I was complaining about. It is the latency of the network and/or internet itself. When I move a slider from position A to position B, the corresponding motion in my browser widow is not smooth. In fact, my plot jumps from that corresponding to position A of the slider to that corresponding to position B of the slider. Worse yet in another notebook, a small dot which traces out a closed curve in time, just jumps from one position to another. I suspect that the distance between successive positions is based the round trip time needed for the signal to travel from my computer to the Wolfram Cloud and back.
Is this issue getting attention?