Simple flash mx 2004 question : tweening

I have a simple question concerning main timeline Tweening in Flash MX 2004 :

  • It is possible to Tween a MovieClip Object on the main timeline.

  • It is possible to break this Tween object … back to the MovieClip object.

  • The appearance and function of the Tweened object on the main timeline look the same.

Does Tweening run faster / better when the Tweened MovieClip object is kept as a tweened object,…or when it is ‘Broken’ back to MovieClip ?