In 2001 I went to Phi Phi in one of the fast, twin 250bhp engine speedboats (Bubpavaree) when the sea was rough...did it slow the crew down? NOT A CHANCE! we were going like effin crazy. I nearly spewed my liver up
the skipper was a bloody lunatic and regularly hit 4500-5500 rpm(Nearly flat out). I thought the whole thing was way too fast for a 'leisure cruise'. I nearly kissed the ground when I got back to the marina at Phuket.