Player stuttering on Animated Model?

So the player is on top of a animated model, big ben as an example here, and the player is stuttering when on there. The Model, which has been rigged to play an animation of itself falling over after 45 seconds, is attached to the platform below with a weld constraint. The platform is being moved with a prismatic constraint. Is there any way to solve the stutter on a model that is rigged for animation?

Also this stutter does not happen with other models on the platform that aren’t animated and they are welded to the platform.

any ideas for a possible solution?