Threading running slower in c# than java

My friend and I decided to write similar programs in Java and C# using threads to post data to a website. His Java application runs in about 6 seconds while mine written in C# takes 23 seconds. Looking at my C# code, is there a reason why it is running slow. Are my threads causing false sharing, or is the C# VM slower than Java's?

We are comparing our codes using 4 threads. Also, we are running this on a local server so server response time is not an issue.

C# Code:

MAIN

Thread[] childThread = new Thread[4]; int i, j = 0, skip = 125; for (i = 0; i < 500; i+=skip, j++) { threader threader = new threader(tokens.GetRange(i, skip)); List<String> test = tokens.GetRange (i, skip); int size = test.Count; childref = new ThreadStart(() => threader.CallToChildThread()); childThread[j] = new Thread(childref); childThread[j].Start(); } 

THREADER

public class threader { public List<String> tokens; public threader(List<String> tokens) { this.tokens = tokens; } public void CallToChildThread() { var watch = System.Diagnostics.Stopwatch.StartNew(); foreach (String item in tokens) { using (var client = new WebClient()) { var values = new NameValueCollection(); values["username"] = "blah"; values["password"] = item; DateTime time = DateTime.Now; var response = client.UploadValues("http://example.com", values); if (!isFound) { var responseString = Encoding.Default.GetString(response); Console.WriteLine(item + " is a " + responseString); if (responseString.Equals("valid")) { isFound = true; Console.WriteLine('\n'); Console.WriteLine(item + " is a " + responseString); Console.WriteLine("==================="); watch.Stop(); var elapsedMs = watch.ElapsedMilliseconds; Console.WriteLine(elapsedMs / 1000 + " Seconds"); return; } } else { return; } } } } } 

My friends Java code that runs in 6 seconds is:

THREADER

public class Threader extends Thread{ public List<String> list; public Threader(List<String> list){ this.list = new ArrayList<String>(list); } @Override public void run() { try { for (String item : list) { String url = "http://example.com"; URL obj = new URL(url); HttpURLConnection con = (HttpURLConnection) obj.openConnection(); //add reuqest header con.setRequestMethod("POST"); String urlParameters = "username=blah&password="+ item; // Send post request con.setDoOutput(true); DataOutputStream wr = new DataOutputStream(con.getOutputStream()); wr.writeBytes(urlParameters); wr.flush(); wr.close(); int responseCode = con.getResponseCode(); BufferedReader in = new BufferedReader( new InputStreamReader(con.getInputStream())); String inputLine; StringBuffer response = new StringBuffer(); while ((inputLine = in.readLine()) != null) { response.append(inputLine); } in.close(); //print result if (!response.toString().equals("invalid")) { System.out.println("Found it!"); System.exit(0); } System.out.println(response.toString() + " for " + item); } } catch (Exception e){e.printStackTrace();} } }