Duel monitors halving my fps!

SammyNib

Honorable
Aug 22, 2013
85
0
10,630
Was just playing a game of Smite not a very well known game but none the less, I was only getting 30 fps which is very surprising because I normally sit on 60 with v-sync enabled. So I decided to unplug my second monitor and straight away my fps went back to 60. I see no reason for this to be happening, I only had my desktop on the second monitor can someone help me?