Added request.Proxy=null everywhere, as discussed in http://stackoverflow.com/questions/2519655/httpwebrequest-is-extremely-slow.

Thanks R.Gunther (rigun@rigutech.nl) https://lists.berlios.de/pipermail/opensim-users/2012-September/010986.html

OpenSim/Framework/UntrustedWebRequest.cs

@@ -88,6 +88,7 @@ namespace OpenSim.Framework
             httpWebRequest.ReadWriteTimeout = readWriteTimeoutMS;
             httpWebRequest.Timeout = timeoutMS;
             httpWebRequest.KeepAlive = false;
+            httpWebRequest.Proxy = null;
 
             return httpWebRequest;
         }