How to reduce memory usage when loading bitmaps from the library?

When I use BitmapData.loadBitmap() to load an image from the library and then attachBitmap() to add it to a MovieClip it takes a lot more memory as opposed to just having the same image inside a MovieClip statically in a frame on it's timeline.
The function dispose() not only clears the BitmapData object but also destroys the previously attached bitmap inside the MovieClip, so it can not be used to free any memory.
Is it how it is supposed to be or is there any other way to dynamically attach bitmaps with memory usage comparable to just having them on stage?

no, you use attachMovie() to create instance from library movieclips that have a linkage id.
you can then create a bitmapdata instance and use the draw() method to overlay as many as needed.

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Alright so let's get down to buisness... what I'm asking, is it impossible to make it simple? I can't just change the bitmap of the MovieClip. If you open up the MovieClip and view it's timeline, the image is a bitmap file withing that MovieClip so if you're able to manipulate other things of a MovieClip, you should be able to manipulate that too right? Such as "MovieClip.Bitmap" (I know that's not the actual property but could it be done?).

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Hi
please help me, I need code to attach a bitmap from the
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How to reduce memory usage when loading bitmaps from the library?

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