PGP,

You wnat to buy performance, then you should get into something with a motor.

Long foils, curved foils canted etc all have the POTENTIAL to add a small bit of performance in some given and usually narrow range of conditions.

Long boards now need to be constantly adjusted, curved foils require quite a bit more crew athletisism and skill etc. Improperly tuned or used features are slower. These things just make the good sailors maybe a bit better in some conditions, and the sailors who now have more than they can do to run their simple boat anywhere near optimum are even further behind.