I am experimenting with the game to see if this is a glitch that others can experience. It's very simple. Use DX11 and load the level "Lost Tunnels" in Chapter 2. At the start, jump over the railing and stand near the wooden wall to the right. Move your mouse around left/right and 360 degrees. Do you experience any stuttering or lag with the aim? It's most noticeable on your gun.
I've found posts on another forum that relate to what I'm experiencing and just want to know if this is part of the engine or not. It only happens in a few specific areas and as soon as I move away it stops.
I have multiple sources where people have experienced similar things.