Better to use SWF vs movieclip

I have an animtion in which I have the background slowly easing away from the user while a movieclip slowly eases in. The problem I am seeing is that the movieclip acts jumpy, especially the text inside of it. So I am wondering if anyone has any suggestions as to hoe to get the thing to be less jumpy/twitchy. I was wondering if loading an external SWF and using that in place of the movieclip might help stabalize things. Any suggestions?

Thanks in advance.