ASP.Net delay, how can I tell if it is the client or the server?

I've got a generic handler on a site. When I go directly to it it responds immediately. When I try to get to it from a .Net program, there is a long (10 second give or take) pause before the server is registering the request.

Here is the code I'm using to hit the server:

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://MYURL/fs.ashx");
request.Method = "POST";
request.ContentType = "text/xml";

// This is the line that takes 10 seconds to return
StreamWriter streamOut = new StreamWriter(request.GetRequestStream(), System.Text.Encoding.ASCII);

streamOut.Write(sXMLToSend);
streamOut.Close();
XmlDocument doc = new XmlDocument();
HttpWebResponse resp = null;
resp = (HttpWebResponse)request.GetResponse();
StreamReader responseReader = new StreamReader(resp.GetResponseStream(), Encoding.UTF8);
sResponse = responseReader.ReadToEnd();
Console.WriteLine(开发者_如何学GosResponse);
resp.Close();

I don't think that this line was taking that long about a week ago, but I don't have any data to back that up. Any ideas what the issue could be? If I hit the url in a browser it responds immediately. Are there any tools that I can use to figure out if it is my machine, or the server, or...I don't even know where to begin.

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Might it just be due to the fact that GetRequestStream is a synchronous method and its buffering it all up before returning? Maybe you should try calling the async version and process data as it comes in.