Lack of Smoothness in Playback

Mac G5, Flash CS3


I’m creating a movie with a swift flying quickly across screen, but in playback it always appears as if there are two or three swifts flying together almost on top of one another, a sort of stuttering effect in the playback. I’ve tried altering frame rate/frame number ratio; tried viewing the swf file in the external movie player, but nothing seems to improve it.

Is this lack of smoothness a basic problem in Flash with moving objects, or is it something to do with my Flash preferences, or even my computer settings? What are the standard ways to try and increase smoothness of playback in Flash?.

Thanks for any help!