Well it's not just the speed. If you are a beginner you want a board that is not very stiff so it is not very responsive, that way you can make mistakes as you learn and not wipe out really hard. Like when you are learning to turn you will appreciate a soft board because if you make a move you did not intend to make then you might be spared a fall, if you are using a stiff board it will respond to that move and it could result in it being a move you didn't want to make. I think the same goes for your boots but if they are a great fit and you like them, that's the important bit.
hope that helped