in C# code GetLifeTimeService takes more processor time in vs2010 but get reduced in 2012

/// <summary>
 /// This method is used to get the remoting instance(transparent proxy).
 /// </summary>
 /// <typeparam name="T">Server Type.</typeparam>
 /// <param name="serverConfig">Instance of Config.</param>
 /// <returns>JobInterface</returns>
 public static T GetInterface<T>(ServerConfig serverConfig)
 {
     T instance = default(T);//EHN_DEC_09
     if (serverConfig != null)
     {
          try
          {
               string url = String.Format("tcp://{0}:{1}/{2}", serverConfig.IPAddress,              serverConfig.Port, serverConfig.URI);
               Log(LogMessageType.Debug, " GetInterface", "GetObject started");
               instance = (T)Activator.GetObject(typeof(T), url);
               Log(LogMessageType.Debug, " GetInterface", "GetObject completed");
               MarshalByRefObject obj = instance as MarshalByRefObject;
               Log(LogMessageType.Debug, " GetInterface", "GetLifetimeService started");
               Object lifeTimeObject = obj.GetLifetimeService();//EHN_DEC_09
               Log(LogMessageType.Debug, " GetInterface", "GetLifetimeService completed");



            }
            //EHN_DEC_09
            //.GetLifeTimeService call is added to check whether the remoting proxy
            //object is valid or not. If the call throws SocketException means the proxy is
            //pointed to invalid remoting objects.
            catch (SocketException ex)
            {
                Log(LogMessageType.Error, " GetInterfaceByServerConfig", ex.ToString());
                //EHN_DEC_09
                instance = default(T);
            }
            catch (Exception ex)
            {
                Log(LogMessageType.Error, "GetInterfaceByServerConfig", ex.ToString());
            }
        }
        return instance;
    }
in the above code GetLifetimeService takes 1 sec to return for the first time call in vs2010 build but in 2012 it is reduced. Can anyone please help me to say why this occurs and way