Mouse on movieclips a lot slows down to a crawl

I have a system where hundreds of similar clips ('parts') can be dragged around in a region ('dragArea') of the mouse. I have performance problems.

When you start to drag a piece, it jumps to the top of the depths, it seems above all others. All parts are dynamically created with createEmptyMovieClip. They are all attached to the dragArea.

My problem is that the movement is very slow. The slipped part updates of position very rarely; only when you stop moving the mouse. I think it's just because I have so many movieclips, but if I attach one of the pieces to _root and drag, then, he hangs out very quickly. That is, if I drag the outside of dragArea, then it is fast. But as soon as I have move it on dragArea, then it becomes slow.

This suggests that the Flash made some redraw complex when I drag a piece on dragArea. I've tried to set cacheAsBitmap to true for dragArea, but that has no effect.

I also tried to reduce the number of parts one or two. This makes everything fast again.

Does anyone know why it would become very slow when you drag a piece on dragArea that contains many other parts?

Thanks in advance for any help.

have you tried upateAfterEvent while dragging?
a lot of times that softens the considerbly of animation...

could it be that his calulating too deep because of all the other parts?
maybe try to set the depth of 0 (zero) for the dragged object, instead of getNextHighestDepth...
If that's what you do... =)

Tags: Adobe Animate

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