Thanks for the reply.
I’m using C4D R.20.
Unfortunately baking to alembic and time remapping does not seem to affect the dynamics, but only other position, rotation and scale keyframes that the animation contains. I’ve also tried to just bake the whole Null containing the object and all possible forces etc., but it again does not seem to affect the speed of the dynamic components.
I’ve tried the way in the video you’ve attached, but I seem to run into a bug (?). In order to use the time remap, I have to bake the whole animation to keyframes. Following the way in the video, the whole animation completely glitches out and the object gets distorted all over the place, as soon as I bake to keyframes. Undoing the bake does not (!) fix this, I have to completely restart Cinema4D to get back to regular dynamic behaviour.
Also, unfortunately, global dynamic time scale does not seem to affect IK based dynamics.