If you open your menu, then close it and look at your avatars legs, you will notice that they're "gliding" instead of moving normally. This happens in regular VR without full body. I have a HTC Vive. You can also recreate this just by moving briefly. You'll notice your legs will stiffen up and not move. The avatar then will do a "re-loading" effect where it's as if the avatar just finished loading in.