Large image sequences in Flash - How to reduce memory usage?

so I'm trying to publish a looping animation in Flash with a large amount of image sequences in it. (around 3000 frames all told). And I'm having problems with the swf using too much memory when it's played.

My understanding is: that Flash will just load all images in a swf into memory unless you dump the memory somehow. Can anyone explain how to do this? Is it possible? I can't seem to find a solution online.

Thanks