The sea is the ultimate judger of the performance.
The design of hull, propulsion, appendages and superstructure in relation to displacement, the center of gravity, installed power etc, should converge to an excellent performance.
This is not always the case and many vessels suffers from poor speed performance, poor maneuverability or course keeping, dynamic instability, un acceptable wash waves etc.
As speed increases the demands for optimal design becomes essential to eliminate poor performance or dangerous behavior.
A hull design that has proven to be seaworthy for one applications might turn out to be dynamically instable for one other applictations. Bow and chine riding or chine walking and porpoising are examples of very unpleasant and even dangourus behaviors that might occur for an unbalanced boat design.