You can't beat physics. Force equals mass times acceleration. If your boat has seat backs, tackle containers, fish boxes, rod holders, etc. it will be a tank (mass). If your two passengers are monsters, they are (mass). You can wax the bottom of your boat to reduce "parasite" drag, and this will help. You should also check trim: pull on the sticks and see if the transom hits the water. If it does, move the center of gravity ahead. If your boat weighs more than about 300 pounds "ready to fish" but without humans, then it is heavier than mine.