Hello,
There was a topic with that issue years ago, I can't find it now.
Let zoom out your view to max range in the game and let the camera lens align / touch an object. Then, if you try to turn with the mouse even extremely slowly it reveals there isn't smooth turning in WoW at all.
This video describes it better than my English:
https://vimeo.com/156337919
I think this caused my micro stuttering when turning the camera in the game normally. I heard this issue is since the launch of WoW, it's the technical limitation of the game, and probably there's nothing to do with it.
I would like to ask, however, if there is *any* way (addon, script, etc) to make the camera turnings as smooth as possible.