* This update contains a bucket-full of network optimizations.

* ParcelProperties are sent only when needed instead of on any movement
* Terse Updates and other temporary data packets are marked unreliable
* After a certain amount of users, the sim actually sends updates on things less
* Experimental
* Tested to 68 avatar with pCampBot  (And it's surprising what actually causes the most lag..  the text chat!)

OpenSim/Framework/ClientManager.cs

@@ -164,6 +164,7 @@ namespace OpenSim.Framework
                 {
                     packet.AgentData.AgentID = LocalClients[i].AgentId;
                     packet.AgentData.SessionID = LocalClients[i].SessionId;
+                    packet.Header.Reliable = false;
                     LocalClients[i].OutPacket(packet, ThrottleOutPacketType.Task);
                 }
 

OpenSim/Region/ClientStack/ClientView.cs

@@ -957,6 +957,7 @@ namespace OpenSim.Region.ClientStack
             kill.ObjectData = new KillObjectPacket.ObjectDataBlock[1];
             kill.ObjectData[0] = new KillObjectPacket.ObjectDataBlock();
             kill.ObjectData[0].ID = localID;
+            kill.Header.Reliable = false;
             OutPacket(kill, ThrottleOutPacketType.Task);
         }
 
@@ -1378,6 +1379,7 @@ namespace OpenSim.Region.ClientStack
             viewertime.TimeInfo.SunDirection = sunPos;
             viewertime.TimeInfo.SunAngVelocity = sunVel;
             viewertime.TimeInfo.UsecSinceStart = (ulong)Util.UnixTimeSinceEpoch();
+            viewertime.Header.Reliable = false;
             OutPacket(viewertime, ThrottleOutPacketType.Task);
         }
 
@@ -1426,6 +1428,7 @@ namespace OpenSim.Region.ClientStack
             }
             viewertime.TimeInfo.SunAngVelocity = new LLVector3(0, 0.0f, 10.0f);
             viewertime.TimeInfo.UsecSinceStart = (ulong)Util.UnixTimeSinceEpoch();
+            viewertime.Header.Reliable = false;
             OutPacket(viewertime, ThrottleOutPacketType.Task);
         }
 
@@ -1521,7 +1524,7 @@ namespace OpenSim.Region.ClientStack
                 ani.AnimationList[i].AnimID = animations[i];
                 ani.AnimationList[i].AnimSequenceID = seqs[i];
             }
-
+            ani.Header.Reliable = false;
             OutPacket(ani, ThrottleOutPacketType.Task);
         }
 
@@ -1581,6 +1584,9 @@ namespace OpenSim.Region.ClientStack
             terse.ObjectData = new ImprovedTerseObjectUpdatePacket.ObjectDataBlock[1];
             terse.ObjectData[0] = terseBlock;
             
+                terse.Header.Reliable = false;
+            
+
             OutPacket(terse, ThrottleOutPacketType.Task);
         }
 
@@ -1604,6 +1610,7 @@ namespace OpenSim.Region.ClientStack
             ib.You = -1;
             ib.Prey = -1;
             loc.Index = ib;
+            loc.Header.Reliable = false;
             OutPacket(loc, ThrottleOutPacketType.Task);
         }
 
@@ -1706,7 +1713,7 @@ namespace OpenSim.Region.ClientStack
             terse.RegionData.TimeDilation = timeDilation;
             terse.ObjectData = new ImprovedTerseObjectUpdatePacket.ObjectDataBlock[1];
             terse.ObjectData[0] = CreatePrimImprovedBlock(localID, position, rotation, velocity, rotationalvelocity);
-
+            terse.Header.Reliable = false;
             OutPacket(terse, ThrottleOutPacketType.Task);
         }
 
@@ -1719,7 +1726,7 @@ namespace OpenSim.Region.ClientStack
             terse.RegionData.TimeDilation = timeDilation;
             terse.ObjectData = new ImprovedTerseObjectUpdatePacket.ObjectDataBlock[1];
             terse.ObjectData[0] = CreatePrimImprovedBlock(localID, position, rotation, velocity, rotationalvelocity);
-
+            terse.Header.Reliable = false;
             OutPacket(terse, ThrottleOutPacketType.Task);
         }
 

OpenSim/Region/Environment/LandManagement/LandManager.cs

@@ -718,23 +718,32 @@ namespace OpenSim.Region.Environment.LandManagement
             }
         }
 
-        public void sendLandUpdate(ScenePresence avatar)
+        public void sendLandUpdate(ScenePresence avatar, bool force)
         {
             Land over = getLandObject((int) Math.Min(255, Math.Max(0, Math.Round(avatar.AbsolutePosition.X))),
                                       (int) Math.Min(255, Math.Max(0, Math.Round(avatar.AbsolutePosition.Y))));
 
             if (over != null)
+            {
+                if (force)
                 {
                     over.sendLandUpdateToClient(avatar.ControllingClient);
+                }
+
                 if (avatar.currentParcelUUID != over.landData.globalID)
                 {
+                    over.sendLandUpdateToClient(avatar.ControllingClient);
                     avatar.currentParcelUUID = over.landData.globalID;
                     m_scene.EventManager.TriggerAvatarEnteringNewParcel(avatar, over.landData.localID,
                                                                         m_scene.RegionInfo.RegionID);
                 }
             }
         }
+        public void sendLandUpdate(ScenePresence avatar)
+        {
+            sendLandUpdate(avatar, false);
 
+        }
         public void handleSignificantClientMovement(IClientAPI remote_client)
         {
             ScenePresence clientAvatar = m_scene.GetScenePresence(remote_client.AgentId);

OpenSim/Region/Environment/Scenes/Scene.cs

@@ -626,6 +626,27 @@ namespace OpenSim.Region.Environment.Scenes
             // Aquire a lock so only one update call happens at once
             updateLock.WaitOne();
             float physicsFPS = 0;
+            int agentsInScene = m_innerScene.GetRootAgentCount() + m_innerScene.GetChildAgentCount();
+
+            if (agentsInScene > 21)
+            {
+                if (m_update_entities == 1)
+                {
+                    m_update_avatars = 5;
+                    m_update_entities = 5;
+                    m_statsReporter.SetUpdateMS(6000);
+                }
+            }
+            else
+            {
+                if (m_update_entities == 5)
+                {
+                    m_update_avatars = 1;
+                    m_update_entities = 1;
+                    m_statsReporter.SetUpdateMS(3000);
+                }
+            }
+
 
             frameMS = System.Environment.TickCount;
             try

OpenSim/Region/Environment/Scenes/ScenePresence.cs

@@ -78,6 +78,7 @@ namespace OpenSim.Region.Environment.Scenes
         private bool m_newCoarseLocations = true;
         private bool m_gotAllObjectsInScene = false;
         
+
         // Default AV Height
         private float m_avHeight = 127.0f;
 
@@ -354,7 +355,7 @@ namespace OpenSim.Region.Environment.Scenes
             RegisterToEvents();
             SetDirectionVectors();
 
-            m_scene.LandManager.sendLandUpdate(this);
+            m_scene.LandManager.sendLandUpdate(this, true);
         }
 
         public ScenePresence(IClientAPI client, Scene world, RegionInfo reginfo, byte[] visualParams,

OpenSim/Region/Environment/Scenes/SimStatsReporter.cs

@@ -124,6 +124,13 @@ namespace OpenSim.Region.Environment.Scenes
             m_report.Enabled = true;
         }
 
+        public void SetUpdateMS(int ms)
+        {
+            statsUpdatesEveryMS = ms;
+            statsUpdateFactor = (float)(statsUpdatesEveryMS / 1000);
+            m_report.Interval = statsUpdatesEveryMS;
+        }
+
         private void statsHeartBeat(object sender, EventArgs e)
         {
             m_report.Enabled = false;