I apologize. Most people here understand the basics. WHAT's (or What is) WOT means "Wide Open Throttle". In the context of this thread it means that if a boat (or engine on a boat) is set up to achieve maximum specification RPM at WOT, then the boat will perform optimally.
To make it even more clearly, if an engine is specified to run 4200-4800 rpm (revolutions per minute) at WOT, and the prop only allows it to run 3900 rpm, then that boat will provide poor performance and the owner will call kit a "DOG".
OTOH (on the other hand) if that same boat is set up to run 4800 rpm at WOT, performance will be stellar and the owner will be happy.
Now, furthermore, HP and speed to correlate. So, if your objective is to be faster than the Johneses, maybe a 3.0 isn't for you.
BTW, my Stingray 19 footer with a 3.0 would run 48 mph all day long with my custom pitched SS prop.