title: Thread doesn't start always immediately in C# ashx file
body: <p>I'm creating a webservice where ZIP-files are generated. Each time a user requests 'downloadzip.ashx', this thread is created:</p>
  
  <pre><code>Thread t = new Thread(() =&gt; generateZIP(maxlat, maxlon, minlat, minlon, app, context, downloadid, rootdirectory, rstring));
  
  t.Start();
  
  if (!t.Join(TimeSpan.FromSeconds(120)))
  {
      t.Abort();
      updateQueue(downloadid, 3);
      context.Response.Write("timeout");
  }
  </code></pre>
  
  <p>This works fine, but when I request url 'downloadzip.ashx' several times, sometimes it takes a minute before the thread starts... </p>