looking at my turn speed it seems much slower than most others speedruns. I have also used a controller to see if that is the problem but I still get the same turning speed.

Update: I have found the problem, Lower FPS affects the speed at wich you turn.

I try it myself on my pc and laptop with keyboard and my ps4 controller. I didn't see any difference. You must be right, your game seem a bit laggy, if you can play with more fps do it.