diff --git a/OpenSim/Framework/IClientAPI.cs b/OpenSim/Framework/IClientAPI.cs
index b2786d45e9..f5fd5f5f42 100644
--- a/OpenSim/Framework/IClientAPI.cs
+++ b/OpenSim/Framework/IClientAPI.cs
@@ -1143,6 +1143,8 @@ namespace OpenSim.Framework
         void SendGenericMessage(string method, UUID invoice, List<string> message);
         void SendGenericMessage(string method, UUID invoice, List<byte[]> message);
 
+        bool CanSendLayerData();
+
         void SendLayerData(float[] map);
         void SendLayerData(int px, int py, float[] map);
 
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
index 36c37801b7..46836b1d61 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLClientView.cs
@@ -1199,6 +1199,15 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             OutPacket(GATRP, ThrottleOutPacketType.Task);
         }
 
+
+        public virtual bool CanSendLayerData()
+        {
+            int n = m_udpClient.GetCatBytesInSendQueue(ThrottleOutPacketType.Land);
+            if ( n > 100000)
+                return false;
+            return true;
+        }
+
         /// <summary>
         ///  Send the region heightmap to the client
         ///  This method is only called when not doing intellegent terrain patch sending and
@@ -9151,7 +9160,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 if ((locX >= m_scene.RegionInfo.WorldLocX)
                             && (locX < (m_scene.RegionInfo.WorldLocX + m_scene.RegionInfo.RegionSizeX))
                             && (locY >= m_scene.RegionInfo.WorldLocY)
-                            && (locY < (m_scene.RegionInfo.WorldLocY + m_scene.RegionInfo.RegionSizeY)) )
+                            && (locY < (m_scene.RegionInfo.WorldLocY + m_scene.RegionInfo.RegionSizeY)))
                 {
                     tpLocReq.Info.RegionHandle = m_scene.RegionInfo.RegionHandle;
                     tpLocReq.Info.Position.X += locX - m_scene.RegionInfo.WorldLocX;
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPClient.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPClient.cs
index 0ae7617a61..4b541e66fd 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPClient.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPClient.cs
@@ -474,6 +474,20 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
             return data;
         }
+
+        public int GetCatBytesInSendQueue(ThrottleOutPacketType cat)
+        {
+            ;
+            int icat = (int)cat;
+            if (icat > 0 && icat < THROTTLE_CATEGORY_COUNT)
+            {
+                TokenBucket bucket = m_throttleCategories[icat];
+                return m_packetOutboxes[icat].Count;
+            }
+            else
+                return 0;
+        }
+
         
         public int GetCatBytesCanSend(ThrottleOutPacketType cat, int timeMS)
         {
diff --git a/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs b/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
index dfafcadb0e..118c8f8634 100644
--- a/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
+++ b/OpenSim/Region/CoreModules/World/Terrain/TerrainModule.cs
@@ -229,11 +229,11 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                 }
 
                 m_scene.RegisterModuleInterface<ITerrainModule>(this);
+                m_scene.EventManager.OnFrame += EventManager_OnFrame;
                 m_scene.EventManager.OnNewClient += EventManager_OnNewClient;
                 m_scene.EventManager.OnClientClosed += EventManager_OnClientClosed;
                 m_scene.EventManager.OnPluginConsole += EventManager_OnPluginConsole;
                 m_scene.EventManager.OnTerrainTick += EventManager_OnTerrainTick;
-                m_scene.EventManager.OnFrame += EventManager_OnFrame;
             }
 
             InstallDefaultEffects();
@@ -767,6 +767,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain
         /// </summary>
         private void EventManager_OnFrame()
         {
+            // this needs fixing
             TerrainData terrData = m_channel.GetTerrainData();
 
             bool shouldTaint = false;
@@ -792,6 +793,7 @@ namespace OpenSim.Region.CoreModules.World.Terrain
                 m_scene.EventManager.TriggerTerrainTainted();
                 m_tainted = true;
             }
+
         }
 
         /// <summary>
@@ -993,6 +995,10 @@ namespace OpenSim.Region.CoreModules.World.Terrain
             {
                 foreach (PatchUpdates pups in m_perClientPatchUpdates.Values)
                 {
+                    // throught acording to land queue free to send bytes
+                    if (!pups.Presence.ControllingClient.CanSendLayerData())
+                        continue;
+
                     if (pups.HasUpdates())
                     {
                         // There is something that could be sent to this client.
diff --git a/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs b/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs
index 51ecc8d8f3..89e18b0eb8 100644
--- a/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs
+++ b/OpenSim/Region/OptionalModules/Agent/InternetRelayClientView/Server/IRCClientView.cs
@@ -997,6 +997,11 @@ namespace OpenSim.Region.OptionalModules.Agent.InternetRelayClientView.Server
             
         }
 
+        public virtual bool CanSendLayerData()
+        {
+            return false;
+        }
+
         public void SendLayerData(float[] map)
         {
             
diff --git a/OpenSim/Region/OptionalModules/World/NPC/NPCAvatar.cs b/OpenSim/Region/OptionalModules/World/NPC/NPCAvatar.cs
index 0b4d03adf2..dcd2a5272d 100644
--- a/OpenSim/Region/OptionalModules/World/NPC/NPCAvatar.cs
+++ b/OpenSim/Region/OptionalModules/World/NPC/NPCAvatar.cs
@@ -671,6 +671,11 @@ namespace OpenSim.Region.OptionalModules.World.NPC
 
         }
 
+        public virtual bool CanSendLayerData()
+        {
+            return false;
+        }
+
         public virtual void SendLayerData(float[] map)
         {
         }
diff --git a/OpenSim/Tests/Common/Mock/TestClient.cs b/OpenSim/Tests/Common/Mock/TestClient.cs
index 96bccd2e47..5daca1e908 100644
--- a/OpenSim/Tests/Common/Mock/TestClient.cs
+++ b/OpenSim/Tests/Common/Mock/TestClient.cs
@@ -590,6 +590,11 @@ namespace OpenSim.Tests.Common.Mock
 
         }
 
+        public virtual bool CanSendLayerData()
+        {
+            return false;
+        }
+
         public virtual void SendLayerData(float[] map)
         {
         }