_visible = false affecting processor?

{
Not having a movie clip on the stage until needed (attachMovie when it’s time, and then kill it as soon as it’s temporarily of no use)

v.

_visible = false
}

^ Is there a difference in processor demand? When setting visible to false, it seems to me that a few extra variables would need to be stored for the movie clip…_x, _y, _width, _height, _alpha, etc., etc., etc…but I wasn’t sure how Flash goes about handling these things or which was better practice?