100ms is more than enough to break the joyful feeling of the computer becoming part of my own body, like a hand tool or a bicycle. Humans are adapted to tool use, and don't need to consciously think of the position of tools they're using. But this effect only works if the tool moves like an ordinary physical object. If you move a pencil, it just moves. It doesn't move and then move again because a designer wanted to play an additional animation after your movement. Until we have direct neural interfaces, all UI animation playback is unrealistic, because it's adding to the physical movement of your fingers, not replacing it.