The standard is 2-3 fps per pound of draw weight. So figure on 20-30 fps for a 10 pound weight range. However some set ups are a bit more effetient and some are a bit less. It would depend on the cam set up, weight on the string and the arrows you use.

The best way to gain speed is draw length, it's about 7-10 fps per inch! This is why so many try to shoot a longer draw length than they need. Or why us people with short draw lengths are at such a dissadvantage when it comes to speed.

Playing with your draw weight is better left to adjusting your bow to your arrows.

Paul