Motion Tween Help (with filters)

Hi! I am having troubles adding filters (such as blurs and dropped shadows) to text, and then animating the text. When I add a filter to the text (like a dropped shadow) and then move the text across the screen, the animation is very bumpy and choppy. Does anyone know why it is doing this? I am actually containing the text inside a movie clip, so i can fade in the text with the alpha channel, and adding the filter to the movie clip. Please help!