The very nature of displacement boats is that they displace water, which must then go somewhere.
There is a formula for the top speed on flat water of such a boat:
4/3 the square root of the length at the waterline – the speed is in knots.
For a boat to climb its bow wave and ‘get out of’ its trap, it must use design features – thus the dinghy can rise above it and plane on top of the water, many modern yachts can too.
Question for you is – what is the displacement boat maximum speed if she is 40 feet, 10 inches LWL? Before design features enter into it of course.