If you have a decent computer it's most likely that you're getting too much fps, as someone said try putting the limit to 240 (Which you can do in the options).
If it's not that and you're legitimitly having problems getting decent fps, you should probably try upgrading your computer, as what you have must be pretty horrible. Because if it's not either you shoulnd't be able to run much else at all as gunz doesn't drag that much resources.
I know... It was working fine about a week ago. Than I did the surveys on ijji than my fps went to ****.
@naomi and zaeb I think I have it at 60 o.o
@Rated, mine gets 240, but I have it blocked at 240.
I wil ltry to defrag it.