MovieClip.prototype vs. function?

Hey guys, I looked around for a clear answer for this and didn’t find any.
I’ve used MovieClip.prototype for a while for declaring a large part of my functions, but I always wonder if having all of these functions in every single movie clip bogs down the flash player. Is it better to use function unless a prototype is absolutely necessary or does it not matter because the function is in memory and not actually being copied into the clips or what?

Muchos Gracias to anyone who can answer,

–EP :slight_smile: