Will adding container Sprites or MovieClips reduce framerate, in those situations where framerate would be an issue (i.e. lots of moving DisplayObjects)? In other words, will framerate be better if I attach everything directly to the stage, than if I attach containerSprite1 to the stage, then attach containerSprite2 to containerSprite1, then attach containerSprite3 to containerSprite2, … , then attach everything else to containerSpriteN? Does it make a difference how many parents (and grandparents, etc) there are between the moving DisplayObjects and the stage?