Adjusting quantity based on 'parent' item

I am trying to write a script to adjust quantity of a set of items based on the quantity chosen of a parent item. I am doing this in the recalc event. The code I have works but it literally takes 3 minutes or so on an estimate with 40 lines. Has anyone done anything like this and can tell me how to do it faster?

 // Will take the quantity of a parent item selected and update all items in same product family  function lineRecalc(type){    //Check to see if the type passed to the function is an item    if (type == 'item') {                var item = nlapiGetCurrentLineItemValue('item', 'item');        var isParent = nlapiGetCurrentLineItemValue('item', 'custcol_vcs_item_qty_updt');        if (isParent == 'T'){            var productFamily = nlapiGetCurrentLineItemValue('item', 'custcol_product_line');            var quantity = nlapiGetCurrentLineItemValue('item', 'quantity');                      //Get the number of lines in the item object            var count = nlapiGetLineItemCount('item');               var line = parseFloat(nlapiGetCurrentLineItemIndex('item'));                         setTimeout(function() {                // Loop through all of the lines                for (var i = line + 1; i <= count; i++)