cacheAsBitmap question

i guess im dong this wrong…

i create movieclips up front. cache them as bitmap.

when i add and remove them from the display list, there is a slight stutter/pause. If i don’t cache them as bitmap, there is no stutter when adding/removing child . So my assumption is that its re-caching them each time they are re-added.

how do i keep them cached so i can remove them from the display list, but keep it in memory for later?

I will add i am doing this on a phone with air/android, i dont think that makes a difference, but my cpu is to powerful to see the stutter.

i tried cacheAsBitmap and cacheAsBitmapMatrix and both