I made Fur Ball Simulation folked from Marimo by tail_y.
How to Pre-Rendering
The best way is use Progression -Flash Framework-. You can treat async-processing as sync-processing by Comand Lib of Progression.
ex)
var com:SerialList = new SerialList() com.addCommand( // start prerender function():void{ for(var i=0; i<NUM; i++){ this.parent.insertCommand( function(){ //render }, new Wait(50) // treat as async ) } }, // complete pre-render function():void{ // your code } ) com.execute()