diff --git a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
index 8ce6bb4cf1..3f1686c5e8 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
@@ -916,13 +916,13 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
             if (NeedsClosing(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY, reg))
             {
-                // RED ALERT!!!!
-                // PLEASE DO NOT DECREASE THIS WAIT TIME UNDER ANY CIRCUMSTANCES.
-                // THE VIEWERS SEEM TO NEED SOME TIME AFTER RECEIVING MoveAgentIntoRegion
-                // BEFORE THEY SETTLE IN THE NEW REGION.
-                // DECREASING THE WAIT TIME HERE WILL EITHER RESULT IN A VIEWER CRASH OR
-                // IN THE AVIE BEING PLACED IN INFINITY FOR A COUPLE OF SECONDS.
-                Thread.Sleep(15000);
+                // We need to delay here because Imprudence viewers, unlike v1 or v3, have a short (<200ms, <500ms) delay before
+                // they regard the new region as the current region after receiving the AgentMovementComplete
+                // response.  If close is sent before then, it will cause the viewer to quit instead.
+                //
+                // This sleep can be increased if necessary.  However, whilst it's active,
+                // an agent cannot teleport back to this region if it has teleported away.
+                Thread.Sleep(2000);
 
                 sp.Scene.IncomingCloseAgent(sp.UUID, false);
             }