Hello, sadly I faced this issue today.
I played 22 hours so far and after a bounty my Player Character (Monk) moves very slowly and he nearly stops in Stealth Mode.
I read all replies here but no answer or fix except "cheat engine" which i will not use.
So please tell me how to fix this issue. I don't have a saved game without the issue and I have to start from scratch if this bug can't be fixed.