Gee, I think it depends on the type of boat. With standard run-about type boats with std power, it is hard to get very much performance increase. Maybe lift the motor a bit and put on a good prop, for best overall performance. Heck some of these hulls run dead flat in the water, and won't trim.
With a trimable hull, a larger motor and power trim, plus a good prop you can raise the performance, maybe by as much as 25%.