In AS 2.0, removeMovieClip() would effectively wipe all memory for that clip and free it up instantly... so I could do massive image management tasks (scanning tiled 60000 pixel square images) with no problems.

In AS 3.0, removeChild() only makes memory eligible for clearance... likewise BitmapData.dispose()... but garbage disposal never seems to happen so I am running up to 1 GB of memory for a single Flash movie and my machine is chugging!

I can't find any reference on forcing garbage collection and (as far as I can make out) am clearing any pointers to these objects.

Does anybody have any suggestions to clear memory more effectively?