Storage Buses should only update the grid when their target changes.

don't set the item count via IDSU unless the count changes ( ignore full inventories )

integration/modules/helpers/MFRDSU.java

@@ -37,12 +37,15 @@ public class MFRDSU implements IMEInventory<IAEItemStack>
 			if ( input.equals( is ) )
 			{
 				long max = dsu.getMaxStoredCount();
-				long additiona = is.stackSize;
+				long storedItems = is.stackSize;
-				additiona += input.getStackSize();
+				if ( max == storedItems )
-				if ( additiona > max )
+					return input;
+
+				storedItems += input.getStackSize();
+				if ( storedItems > max )
 				{
 					IAEItemStack overflow = AEItemStack.create( is );
-					overflow.setStackSize( (int) (additiona - max) );
+					overflow.setStackSize( (int) (storedItems - max) );
 					if ( mode == Actionable.MODULATE )
 						dsu.setStoredItemCount( (int) max );
 					return overflow;

parts/misc/PartStorageBus.java

@@ -166,15 +166,6 @@ public class PartStorageBus extends PartUpgradeable implements IGridTickable, IC
 		cached = false;
 		if ( fullReset )
 			handlerHash = 0;
-		try
-		{
-			// force grid to update handlers...
-			proxy.getGrid().postEvent( new MENetworkCellArrayUpdate() );
-		}
-		catch (GridAccessException e)
-		{
-			// :3
-		}
 
 		IMEInventory<IAEItemStack> out = getInternalHandler();
 		IItemList<IAEItemStack> after = AEApi.instance().storage().createItemList();
@@ -237,6 +228,16 @@ public class PartStorageBus extends PartUpgradeable implements IGridTickable, IC
 		if ( handlerHash == newHandlerHash && handlerHash != 0 )
 			return handler;
 
+		try
+		{
+			// force grid to update handlers...
+			proxy.getGrid().postEvent( new MENetworkCellArrayUpdate() );
+		}
+		catch (GridAccessException e)
+		{
+			// :3
+		}
+
 		handlerHash = newHandlerHash;
 		handler = null;
 		monitor = null;