From 71f1926723e388cc370e8b45ee1f65836a99cc61 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 13 Apr 2016 00:25:28 -0400
Subject: [PATCH] Remove unused World Tile Entity List

Massive hit to performance and it is completely unnecessary.

diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 0c460b1..0e2176e 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -68,7 +68,7 @@ public abstract class World implements IBlockAccess {
     };
     // Spigot end
     protected final Set<Entity> f = Sets.newHashSet(); // Paper
-    public final List<TileEntity> tileEntityList = Lists.newArrayList();
+    //public final List<TileEntity> tileEntityList = Lists.newArrayList(); // Paper - remove unused list
     public final List<TileEntity> tileEntityListTick = Lists.newArrayList();
     private final List<TileEntity> b = Lists.newArrayList();
     private final Set<TileEntity> tileEntityListUnload = Sets.newHashSet(); // Paper
@@ -1590,7 +1590,7 @@ public abstract class World implements IBlockAccess {
         // CraftBukkit start - From below, clean up tile entities before ticking them
         if (!this.tileEntityListUnload.isEmpty()) {
             this.tileEntityListTick.removeAll(this.tileEntityListUnload);
-            this.tileEntityList.removeAll(this.tileEntityListUnload);
+            //this.tileEntityList.removeAll(this.tileEntityListUnload); // Paper - remove unused list
             this.tileEntityListUnload.clear();
         }
         // CraftBukkit end
@@ -1641,7 +1641,7 @@ public abstract class World implements IBlockAccess {
             if (tileentity.y()) {
                 tilesThisCycle--;
                 this.tileEntityListTick.remove(tileTickPosition--);
-                this.tileEntityList.remove(tileentity);
+                //this.tileEntityList.remove(tileentity); // Paper - remove unused list
                 if (this.isLoaded(tileentity.getPosition())) {
                     this.getChunkAtWorldCoords(tileentity.getPosition()).d(tileentity.getPosition());
                 }
@@ -1679,7 +1679,7 @@ public abstract class World implements IBlockAccess {
                         this.notify(tileentity1.getPosition(), iblockdata, iblockdata, 3);
                         // CraftBukkit start
                         // From above, don't screw this up - SPIGOT-1746
-                        if (!this.tileEntityList.contains(tileentity1)) {
+                        if (true) { // Paper - remove unused list
                             this.a(tileentity1);
                         }
                         // CraftBukkit end
@@ -1699,9 +1699,9 @@ public abstract class World implements IBlockAccess {
     protected void l() {}
 
     public boolean a(TileEntity tileentity) {
-        boolean flag = this.tileEntityList.add(tileentity);
+        boolean flag = true; // Paper - remove unused list
 
-        if (flag && tileentity instanceof ITickable) {
+        if (flag && tileentity instanceof ITickable && !this.tileEntityListTick.contains(tileentity)) { // Paper
             this.tileEntityListTick.add(tileentity);
         }
 
@@ -2135,7 +2135,7 @@ public abstract class World implements IBlockAccess {
         } else {
             if (tileentity != null) {
                 this.b.remove(tileentity);
-                this.tileEntityList.remove(tileentity);
+                //this.tileEntityList.remove(tileentity); // Paper - remove unused list
                 this.tileEntityListTick.remove(tileentity);
             }
 
-- 
2.9.3