Race boards can not go really fast, because of two things:
1. The big and multiple fins and size are useless and way too much drag compared to small single fins as on speed boards.
2. Control is almost impossible with such a fin size on such wide boards
So a raceboard is not a speed board, but an "upwind" board, that still has reasonably good speed on deep reaches and halfwind because of a flat rockerline - but still restricted hugely compared to "faster" boards, because of the fin size and lack of control.
Peter