Help! Slow motiontweens when using loadMovie

I’m building a full flash site from a tutorial I read on kirupa. I’ve created a main menu in which I use loadMovie to load in each content page.

I have some motion tweens on these content pages, and they slow down dramatically once they’re loaded in. When I preview them on their own, they’re perfectly fine. Help!! I’ve checked that each content page has the same FPS as the main menu/template.

What could be wrong??