Avoid quadratic behavior from rebuilding the entire crafting cache for

each interface visited. Instead rebuild it at most once per tick, like
cpu clusters.

This is particularly important when channels are disabled, since in
that case even adding a cable visits every grid node.

src/main/java/appeng/me/cache/CraftingGridCache.java

@@ -114,6 +114,7 @@ public class CraftingGridCache implements ICraftingGrid, ICraftingProviderHelper
 	private IStorageGrid storageGrid;
 	private IEnergyGrid energyGrid;
 	private boolean updateList = false;
+	private boolean updatePatterns = false;
 
 	public CraftingGridCache( final IGrid grid )
 	{
@@ -138,6 +139,12 @@ public class CraftingGridCache implements ICraftingGrid, ICraftingProviderHelper
 			this.updateCPUClusters();
 		}
 
+		if( this.updatePatterns )
+		{
+			this.updatePatterns = false;
+			this.updatePatterns();
+		}
+
 		final Iterator<CraftingLinkNexus> craftingLinkIterator = this.craftingLinks.values().iterator();
 		while( craftingLinkIterator.hasNext() )
 		{
@@ -185,7 +192,7 @@ public class CraftingGridCache implements ICraftingGrid, ICraftingProviderHelper
 		if( machine instanceof ICraftingProvider )
 		{
 			this.craftingProviders.remove( machine );
-			this.updatePatterns();
+			this.updatePatterns = true;
 		}
 	}
 
@@ -219,7 +226,7 @@ public class CraftingGridCache implements ICraftingGrid, ICraftingProviderHelper
 		if( machine instanceof ICraftingProvider )
 		{
 			this.craftingProviders.add( (ICraftingProvider) machine );
-			this.updatePatterns();
+			this.updatePatterns = true;
 		}
 	}
 
@@ -337,7 +344,7 @@ public class CraftingGridCache implements ICraftingGrid, ICraftingProviderHelper
 	@MENetworkEventSubscribe
 	public void updateCPUClusters( final MENetworkCraftingPatternChange c )
 	{
-		this.updatePatterns();
+		this.updatePatterns = true;
 	}
 
 	@Override