From aa73526a81df5b7120cf6c8384b7a5840c46e00d Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 27 Apr 2016 22:09:52 -0400
Subject: [PATCH] Improve Minecraft Hopper Performance

Removes unnecessary extra calls to .update() that are very expensive
Also reset cooldown each hopper tick that a hopper is full.

diff --git a/src/main/java/net/minecraft/server/TileEntity.java b/src/main/java/net/minecraft/server/TileEntity.java
index f579d28..6962c1b 100644
--- a/src/main/java/net/minecraft/server/TileEntity.java
+++ b/src/main/java/net/minecraft/server/TileEntity.java
@@ -36,6 +36,7 @@ public abstract class TileEntity {
         }
     }
 
+    static boolean IGNORE_TILE_UPDATES = false; // Paper
     public World getWorld() {
         return this.world;
     }
@@ -105,6 +106,7 @@ public abstract class TileEntity {
 
     public void update() {
         if (this.world != null) {
+            if (IGNORE_TILE_UPDATES) return; // Paper
             IBlockData iblockdata = this.world.getType(this.position);
 
             this.h = iblockdata.getBlock().toLegacyData(iblockdata);
diff --git a/src/main/java/net/minecraft/server/TileEntityHopper.java b/src/main/java/net/minecraft/server/TileEntityHopper.java
index 243da36..68d096f 100644
--- a/src/main/java/net/minecraft/server/TileEntityHopper.java
+++ b/src/main/java/net/minecraft/server/TileEntityHopper.java
@@ -185,12 +185,15 @@ public class TileEntityHopper extends TileEntityLootable implements IHopper, ITi
                 }
                 // Paper end
             }
+
+            if (!isCooledDown() && isFull()) { setCooldown(world.spigotConfig.hopperTransfer); } // Paper
             return false;
         } else {
             return false;
         }
     }
 
+    boolean isFull() { return q(); } // Paper // OBFHELPER
     private boolean q() {
         ItemStack[] aitemstack = this.items;
         int i = aitemstack.length;
@@ -485,7 +488,9 @@ public class TileEntityHopper extends TileEntityLootable implements IHopper, ITi
             boolean flag = false;
 
             if (itemstack1 == null) {
+                IGNORE_TILE_UPDATES = true; // Paper
                 iinventory.setItem(i, itemstack);
+                IGNORE_TILE_UPDATES = false; // Paper
                 itemstack = null;
                 flag = true;
             } else if (a(itemstack1, itemstack)) {
@@ -505,7 +510,7 @@ public class TileEntityHopper extends TileEntityLootable implements IHopper, ITi
                         tileentityhopper.setCooldown(tileentityhopper.world.spigotConfig.hopperTransfer); // Spigot
                     }
 
-                    iinventory.update();
+                    //iinventory.update(); // Paper
                 }
 
                 iinventory.update();
@@ -580,6 +585,7 @@ public class TileEntityHopper extends TileEntityLootable implements IHopper, ITi
         this.g = i;
     }
 
+    boolean isCooledDown() { return o(); } // Paper // OBFHELPER
     public boolean o() {
         return this.g > 0;
     }
-- 
2.8.1