XML Design with Large Datasets for ActionScript3

I have a very large XML file that has 40,000 data, and when I try to load XML using ActionScript3 and then populate the data in an array, I get the following error:

A script took longer than the default timeout period of 15 seconds.

Is there a way to get around this timeout issue? Here is an example XML

<Map>
   <Data>0</Data>
   <Data>1</Data>
   <Data>2</Data>
   <Data>3</Data>
    // continue for many many times
   <Data>39999</Data>
</Map>

      

        
        
        
      

    

The line break seems to be in the for loop. The code is like this

var aNumberArray:Array = new Array( 200 * 200 );
var nRowIndex:int = 0;
for ( ; 200 > nRowIndex; ++nRowIndex ) {
    var nColumnIndex:int = 0;
    for ( ; 200 > nColumnIndex; ++nColumnIndex ) {
        var nIndex:int = nColumnIndex + nRowIndex * 200;
        // assume cXMLMap is already a pre read XML class
        aNumberArray[ nIndex ] = new int( cXMLMap.Data[ nIndex ] );
    }
}

      

        
        
        
      

    

I suspect it cXMLMap.Data[ nIndex ]

takes a long time to get the variable from XML. Please advice.