Create the settings object only in DEBUG mode.

XenModel/XenAPI/JsonRpc.cs

@@ -212,7 +212,9 @@ namespace XenAPI
             // for performance reasons it's preferable to deserialize directly
             // from the Stream rather than allocating strings inbetween
             // therefore the latter will be done only in DEBUG mode
+#if DEBUG
             var settings = new JsonSerializerSettings {Formatting = Formatting.Indented, Converters = serializer.Converters};
+#endif
 
             using (var str = webRequest.GetRequestStream())
             using (var sw = new StreamWriter(str))