Jumpy scroller

Hi,

I’ve been using this tutorial to make scrollers

http://www.flashkit.com/tutorials/Interactivity/Other/More_Scr-Dan_Ludw-202/index.php

and it works great with images, but it gets kind of jumpy when using just a big amount of text, it doesn’t run smoothly and the draggable ball just skips through the text instead of going through it smoothly bit by bit…

Anybody any clue of what’s wrong with it?

thanks!!