For a given design cats don't have to be any lighter than mono hulls to perform. They are more weight distribution sensitive because of their fine ends, particularly forward. Cats generally can be more fuel efficient than mono hulls as a function of reduced wave making drag due to the fine entries of the two hulls, and usually reduced wetted surface, requiring less horsepower for a given size and displacement. The finer the hulls the more fuel efficient, but the more payload sensitive for a given length. Horsepower to weight is a factor equally with cats or mono hulls particularly at planning speeds. The misconception that cats have to be light compared to mono hulls to perform is based on the fact that they have not been built to the designers original intent when it comes to displacement, or a payload was not taken into consideration when designed. All boats whether cat or mono hull trying to travel at faster than displacement speeds, perform better when lighter. Momentum from heavier displacement which the gentleman was referring to, can help punching into a head sea at displacement speed but overall for me lighter is better because it requires less horsepower. Now if we can just get the consumer to put up with 5' 10" headroom and pay the exta 100k to build them out of pre-preg carbon.