Anti-aliasing confusion

I am a little confused about Flash 8 anti-aliasing options. I am using a regular font (Helevetica Neue)in a movie clip and am animating the clip. If I set it to anti-alias for animation, the font is not clear and easy-to-read but it animates smoothly.
If I select anti-alias for readability, the text is nice and clear to read, but the alpha fade-in animation is very jerky.

How do I get a piece of text to fade-in smoothly and yet be crystal clear to read?