Stop messing order of updates, destroing the defined order of the selected priority (by distance being the one that makes sense(?). So called fairness serves no usefull purpose. If a region is lagged or user has bad comms, and far objects updates don't arrive, at least nearby thinks do have a chance to keep ticking. Just test on a big region and observe rez order on arrival. lower viewer bandwith helps seeing the diference. No use to put in core since cmic loves the priority scrambling code i comented out.

OpenSim/Framework/PriorityQueue.cs

@@ -139,7 +139,12 @@ namespace OpenSim.Framework
         {
             // If there is anything in priority queue 0, return it first no
             // matter what else. Breaks fairness. But very useful.
-            for (int iq = 0; iq < NumberOfImmediateQueues; iq++)
+//            for (int iq = 0; iq < NumberOfImmediateQueues; iq++)
+            
+
+            // keep original order 
+            
+            for (int iq = 0; iq < NumberOfQueues; iq++)
             {
                 if (m_heaps[iq].Count > 0)
                 {
@@ -151,7 +156,7 @@ namespace OpenSim.Framework
                     return true;
                 }
             }
-            
+/*            
             // To get the fair queing, we cycle through each of the
             // queues when finding an element to dequeue. 
             // We pull (NumberOfQueues - QueueIndex) items from each queue in order
@@ -193,7 +198,7 @@ namespace OpenSim.Framework
                     return true;
                 }
             }
-
+*/
             timeinqueue = 0;
             value = default(IEntityUpdate);
             return false;