Guild Wars 2

Since 2-3 days i have this weird thing with my mouse cursor. Whenever big zerg fights going on in WvW my cursor seems to be very slow, or even stops reacting. I am not sure if this is part of the extreme lag going on since stability change.
But I can tell ya it is not due to my mouse since it is a brand new one and I have tested it in various other programs with no problems at all. If it is quiet on the borderlands it doesnt seem to occur.

Edited to get rid of some weird typos.