125 FPS or 90?
I always get 90 in my pc...
125. If you get in a game, then press Escape you should see a menu at the top. Then press "System" and near the bottom you should see
"Max Frames/Second". Simply click on that, and make it 125(which is the max for Urban Terror).
The higher FPS, the better it is, as you know, but it's better to have a stable ~100, than having an FPS that keeps going up and down from 100-115-125 etc. That will make you "fps lag".