IE XML Iteration very slow

Question

Hi Guys,
I have JavaScript code that iterates through elements of XML. The problem is that IE 6 is very slow when compared to Firefox and IE 7.
I am wondering is there any quicker way to iterate through the XML?
Here is some of my code:
function createTasks() {
var imageName = null;
var latitude = null;
var longitude = null;
var taskId = null;
var visible = null;
var baseStation = null;
var vehicleId = null;
var taskImageCounter = 1;
var sTime;
var eTime;
if (BrowserDetect.browser == "Explorer") {
alert("loading XML IE...);
startLoadTime=(new Date()).getTime();     
var taskPos = mapIconsFrame.document.getElementById("taskXmlData").innerHTML;
var xmlTaskObj;
if (window.ActiveXObject) {
xmlTaskObj = new ActiveXObject("Microsoft.XMLDOM");
xmlTaskObj.async = "false";
xmlTaskObj.loadXML(taskPos);
if (xmlTaskObj != null) {
var data = xmlTaskObj.documentElement;
var tasksOnMap = xmlTaskObj.documentElement.getElementsByTagName("TASKSONMAP");
tasksOnMapCounter = tasksOnMap.length;
finishedLoadTime=(new Date()).getTime();     
alert("Loading Tasks XML Took..." + ((finishedLoadTime - startLoadTime) / 1000) )
if (tasksOnMapCounter != allTaskMarkersCounter)
alert("Iterating Through Tasks...")
*{color:#339966}// THIS TAKES A WHILE.... ANY SUGGESTIONS??? {color}*
startIterTime=(new Date()).getTime();     
*for (i = 0; i <= tasksOnMap.length - 1; i++)*
*imageName = data.childNodes.childNodes[0].nodeTypedValue;*
*latitude = data.childNodes[i].childNodes[1].nodeTypedValue;*
*longitude = data.childNodes[i].childNodes[2].nodeTypedValue;*
*taskId = data.childNodes[i].childNodes[3].nodeTypedValue;*
*connected = data.childNodes[i].childNodes[4].nodeTypedValue;*
*visible = data.childNodes[i].childNodes[5].nodeTypedValue;*
*baseStation = data.childNodes[i].childNodes[6].nodeTypedValue;*
*vehicleId = data.childNodes[i].childNodes[7].nodeTypedValue;*
endIterTime=(new Date()).getTime();
alert("Iterating Tasks Took..." + ((endIterTime - startIterTime) / 1000))     
{color:#339966}*// USUALLY ABOUT 82-100 SECONDS for approx 600 Items in the XML!!!!*{color}
sTime =(new Date()).getTime();
else
alert("Loading Tasks XML FireFox...")
startLoadTime=(new Date()).getTime();     
var tasksOnMap = mapIconsFrame.document.getElementById("taskXmlData").getElementsByTagName("tasksOnMap");     
tasksOnMapCounter = tasksOnMap.length;
var objectPos = mapIconsFrame.document.getElementById("taskXmlData").innerHTML;
finishedLoadTime=(new Date()).getTime();     
alert("Loading Tasks XML Took..." + ((finishedLoadTime - startLoadTime) / 1000) )
if (tasksOnMapCounter != allTaskMarkersCounter)
allTaskMarkers= [];     
alert("Iterating Through Tasks...")
startIterTime=(new Date()).getTime();     
for (var i = 0; i < tasksOnMap.length; i++)
var objImageName = tasksOnMap[i].getElementsByTagName("imageName");
var objLatitude = tasksOnMap[i].getElementsByTagName("latitude");
var objLongitude = tasksOnMap[i].getElementsByTagName("longitude");
var objTaskId = tasksOnMap[i].getElementsByTagName("taskId");
var objVisible = tasksOnMap[i].getElementsByTagName("visible");
var objVehicleId = tasksOnMap[i].getElementsByTagName("vehicleId");
imageName = objImageName[0].firstChild.data;
latitude = objLatitude[0].firstChild.data;
longitude = objLongitude[0].firstChild.data;
taskId = objTaskId[0].firstChild.data;
visible = objVisible[0].firstChild.data;
vehicleId = objVehicleId[0].firstChild.data;
displayTask(visible, vehicleId, latitude, longitude, taskId, imageName);
endIterTime=(new Date()).getTime();
alert("Iterating Tasks Took..." + ((endIterTime - startIterTime) / 1000))     
{color:#339966}*// USUALLY 7-12 SECONDS IN FIREFOX WHICH IS EXCEPTABLE!!!*{color}
alert("Drawing " + allTaskMarkers.length + " Tasks...")
sTime =(new Date()).getTime();
//map.addOverlays(allTaskMarkers);
eTime=(new Date()).getTime();
alert("Tasks Drawn in: " + ((eTime - sTime) / 1000))     
eTime = 0;
sTime = 0;
Has anyone any suggestions od speeding up the iterator in IE ?

Answer 1

Hi,
I suggest you test the issue with no add-on first.
Check Internet Explorer Add-Ons
=========================
1. Click Tools, and then click Internet Options. 
2. Click the "Programs" tab, and then click Manage Add-ons. 
3. Select an add-on in the Name list, and then click Disable. 
4. Restart IE with Add-ons and check the issue again.
Also refer to this: http://support.microsoft.com/gp/pc_ie_intro
Hope this helps.
Vincent Wang
TechNet Community Support