http://bugs.winehq.org/show_bug.cgi?id=29325
--- Comment #5 from GyB gyebro69@gmail.com 2013-06-13 14:37:38 CDT --- (In reply to comment #4)
I imagine this still happens with current Wine, but do you happen to know if Nouveau behaves any better here?
Yes, the problem is still present in wine-1.6-rc1-47-gf8c7cd9, Nvidia binary drivers 319.23. With the open source Nouveau driver the problem doesn't exist, the mouse cursor is moving at normal speed.