Mouse flickering on game

Hello everybody !

I got a problem about my cursor in game on the realm Icecrown. My cursor just flickering on game. When I move it, flickering start and then I lost huge FPS. When I don't move the cursor, everything is ok. I've tried my mouse on other games and everything is good. Only on Wow it's flickering. I've just uncheck the option "Hardware cursor" but now the cursor is really slow and this is very difficul to play with on dungeon or raid because i'm only using my spells with mouse.

I've tried to install the last driver for my GPU and the mouse, tested some options on Windows but nothing. Do you have any issues for my problem please ?

Ty in advance.