Weird In-Game Issue

Hey, so I have just downloaded and started playing on the Wrath Lordaeron server and when I move my cursor too fast it will flicker and give me massive FPS drops. I might add if I am panning the camera around by holding left or right click, its totally fine. Has any one else had this issue and know how to fix?

Enable/Disable Hardware cursor from game options, see if that helps.

Thank you, disabling this option has fixed the problem. I tried looking for the option earlier but must of over looked it. Thank you :)