Simple animation slows down movie

Hey all,

I’m fairly new to Flash, so I obviously have a problem. I have three buttons come onto the screen (from offscreen left), and they ease into place on the left hand portion of the page. These buttons were exported from Illustrator in a SWF format with a low file size (around 4K each).

The problem is: once the second button comes in, it begins to slow down the whole animation. I have little blips coming out of the upper left hand corner, and they get stuttery and chopfesty. This bothers me, since this isn’t a very complex animation and I know that I’ve seen flash animations with more complex animation going on without stuttering.

Any help to keep animations silky smooth would be greatly appreciated!