* Clarified what FireQueueEmpty is doing with a MIN_CALLBACK_MS constant and upped it to 30ms

* Removed the unused PacketSent() function
* Switched UnackedPacketCollection from a SortedDictionary to a Dictionary now that the sorting is no longer needed. Big performance improvement for ResendUnacked()

OpenSim/Region/ClientStack/LindenUDP/LLUDPServer.cs

@@ -674,10 +674,6 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             packetInbox.Enqueue(new IncomingPacket(udpClient, packet));
         }
 
-        protected override void PacketSent(UDPPacketBuffer buffer, int bytesSent)
-        {
-        }
-
         private void SendAckImmediate(IPEndPoint remoteEndpoint, uint sequenceNumber)
         {
             PacketAckPacket ack = new PacketAckPacket();