Adding thousands of instances of a movie clip

I am trying to add around 20,000 instances of a single small movie clip (HexTile) from the library into a container Sprite using actionscript. The problem is it loads immediately and it loads very slowly, so I would like to know if there is a way to preload it? The class that adds the movie clip library symbol (World) is not the document class, nor is it referenced from the document class. I have tried dragging an empty sprite linked to World, and I have tried exporting it to other frames as well is preloading it as it's own .swf...any suggestions would greatly appreciated! The code looks like: