How do i reduce xml file reading time ???

[AccEng]

I used following code to access a service hosted in https. The out put I need to process is a xml document which takes too much time (30 seconds) after application being idle for more than 10 minutes. Please Help me finding the issue with this.

public LBSLocation GetLBSLocationInfo(string mobileNo)
{
LBSLocation location = new LBSLocation();
try
{
String URL ="https://125.214.169.85/gmlc/legacy?classID=web_engine_v2&methodID=Handler&username=abc&password=1234ff&clientcode=ABB&phoneno=77 7733773"

XmlDocument doc = new XmlDocument();

HttpWebRequest rq = (HttpWebRequest)WebRequest.Create(URL);

System.Net.ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(RemoteCertificateValidationCallback);


HttpWebResponse response = rq.GetResponse() as HttpWebResponse;
using (Stream responseStream = response.GetResponseStream())
{
XmlTextReader reader = new XmlTextReader(responseStream);
doc.Load(reader);




XmlNodeList nodeList = doc.GetElementsByTagName("location");

for (int i = 0; i < nodeList.Count; i++)
{
XmlNode n = (XmlNode)nodeList[i];

location.Latitude = n.ChildNodes[0].InnerText;
location.Longitude = n.ChildNodes[1].InnerText;
location.LocationName = n.ChildNodes[2].InnerText;
}
}


return location;
}
catch (Exception ex)
{
throw ex;
}

}

public static bool RemoteCertificateValidationCallback(object sender, X509Certificate certificate,
X509Chain chain, SslPolicyErrors errors)
{
return true;
}

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