How to remove influence of all physics from an animated object?

I have an animated character with root motion. When animating at normal spped things work great, but if (becasue I have to) fast forward the speed to x20, the actor seems to gain momentum and ends up sliding along and even rotating on the vertical axis. This is despite not simulating physics and even removing gravity.

So how do I completely remove physics calculations from the actor? Or just stop the physics engine from working at all.