Question XR RIG Movement Speed

I've been trying for the most part of the day to determine the player movement speed with XR and Quest2. (PCVR).

I can get a speed when using Locomotion, but I'm after the speed at which I the player walk around my physical space.

I've tried comparing a bunch of transform positions, and also tried looking at various velocities from controllers and HMD, and even accessing the CharacterController velocity, but none of these are helping....

I assume it would be something like the difference between MainCamera(HMD) local and worldspace, but cannot seem to get anything useful. (OldPos vs NewPos).

Any ideas on how to determine a speed I'm walking around at?

Thanks for any help/advice.

 

Compare the position of the camera in fixedupdate (or update if you take into account deltatime)