Complex LoadMovie to attachMovie

I have a perfectly working script that loops though an array and pumps out as many dynamically created blankMovieClips as needed. Then I have a loadMovie command that loads an external swf in to all of the blankMovieClips. Check it:


_root.loadbanner_mc.createEmptyMovieClip("banner"+i, i+3);
loadMovie("DB.swf","_root.loadbanner_mc.banner"+i);

What I would like to do is change my load approach and use the attachMovie command. Can someone help with the difference between the two commands? How can I do the same thing with the attachMovie command?

I am hoping this will decrease fill size an increase performance. I am loading 30 to 40 clips that are 10k each. That adds up fast for a modem.