This is the code that is used for the parsing:

function go(xmlDocumentURL){
_root.xmlHolder = new XML();
_root.xmlHolder.onLoad = stopTimer;
_root.xmlholder.load(xmlDocumentURL);
}

function stopTimer(){
_root.loadTime = getTimer() - _root.startTime;
trace("Ended.");
}

As you can see this is purely testing the XML loading, it is not actually doing any parsing in Flash.