From 991a1ae6922a3bfab70d43eccec3d5843c80088d 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 1f3e89b..b2122a9 100644
--- a/src/main/java/net/minecraft/server/TileEntity.java
+++ b/src/main/java/net/minecraft/server/TileEntity.java
@@ -33,6 +33,7 @@ public abstract class TileEntity {
         return (MinecraftKey) TileEntity.f.b(oclass);
     }
 
+    static boolean IGNORE_TILE_UPDATES = false; // Paper
     public World getWorld() {
         return this.world;
     }
@@ -111,6 +112,7 @@ 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.g = 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 f12bc70..4ebcf47 100644
--- a/src/main/java/net/minecraft/server/TileEntityHopper.java
+++ b/src/main/java/net/minecraft/server/TileEntityHopper.java
@@ -455,7 +455,9 @@ public class TileEntityHopper extends TileEntityLootable implements IHopper, ITi
             boolean flag1 = iinventory1.w_();
 
             if (itemstack1.isEmpty()) {
+                IGNORE_TILE_UPDATES = true; // Paper
                 iinventory1.setItem(i, itemstack);
+                IGNORE_TILE_UPDATES = false; // Paper
                 itemstack = ItemStack.a;
                 flag = true;
             } else if (a(itemstack1, itemstack)) {
@@ -486,7 +488,7 @@ public class TileEntityHopper extends TileEntityLootable implements IHopper, ITi
                     }
                 }
 
-                iinventory1.update();
+                //iinventory1.update(); // Paper
             }
         }
 
@@ -558,6 +560,7 @@ public class TileEntityHopper extends TileEntityLootable implements IHopper, ITi
         this.f = i;
     }
 
+    boolean isCooledDown() { return J(); } // Paper - OBFHELPER
     private boolean J() {
         return this.f > 0;
     }
-- 
2.10.2