Generally, you should try and match it to real world numbers. For example, I am 1.92m tall, so if I were to put a human in my game, I'd make him about 2 DBP Units tall. My house is about 15m tall, so if I were to use a house in my game, I'd try to make it about 15 DBP units tall.
Physics plugins generally rely on these dimensions, and it's much easier to compute gravity, mass etc. if you're already using correct dimensions.
Note that if you're using objects way too small, or way too big, you may exceed some data type limitations.
Quote: "frame rate"
It doesn't change the frame rate.
TheComet
Private CARROT() As Char = {"^"c} - The codebase