Index: Connection.cs
===================================================================
--- Connection.cs	(revision 693)
+++ Connection.cs	(working copy)
@@ -29,6 +29,7 @@
 #endif
 using System.Text;
 using IsolationLevel=System.Data.IsolationLevel;
+using System.Collections.Generic;
 
 namespace MySql.Data.MySqlClient
 {
@@ -57,6 +58,10 @@
         /// <include file='docs/MySqlConnection.xml' path='docs/InfoMessage/*'/>
         public event MySqlInfoMessageEventHandler InfoMessage;
 
+        private static Dictionary<string, MySqlConnectionStringBuilder> globalConnectionStringCache = 
+            new Dictionary<string, MySqlConnectionStringBuilder>();
+
+
 #if MONO2
     /// <include file='docs/MySqlConnection.xml' path='docs/StateChange/*'/>
         public event StateChangeEventHandler StateChange;
@@ -248,8 +253,14 @@
                         "Not allowed to change the 'ConnectionString' property while the connection (state=" + State +
                         ").");
 
-                MySqlConnectionStringBuilder newSettings =
-                    new MySqlConnectionStringBuilder(value);
+                MySqlConnectionStringBuilder newSettings = null;
+
+                if (!globalConnectionStringCache.TryGetValue(value, out newSettings)) {
+                    lock (globalConnectionStringCache) {
+                        globalConnectionStringCache[value] = newSettings = new MySqlConnectionStringBuilder(value);
+                    }
+                }
+
                 settings = newSettings;
                 if (driver != null)
                     driver.Settings = newSettings;