I have a 25 ft Mariah bowrider and I must say I am amazed by the speed of pontoon boats today. I have ceased to look at a pontoon as being a party barge.
Living in Alton Bay, our trips in and out of Alton Bay is sometimes made a little interesting dealing with tubers and skiers. What is amazing is the number of pontoons that are pulling these tubers and skiers, including big kids on the toys.
It is also amazing to see the number of pontoons that will anchor and have the kids jumping and diving into the water as the party continues. Lots of room, speed and stability, and the ability to go from a rough area to a smoother area in relative comfort and safety. All this coming from someone who just a few short years ago would not be caught dead on a pontoon.
As GBB said, if performance is what you want, get one with a performance package.