From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Paul Sauve <paul@technove.co>
Date: Thu, 4 Feb 2021 23:33:52 -0600
Subject: [PATCH] Reduce chunk loading & lookups

Airplane
Copyright (C) 2020 Technove LLC

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

diff --git a/src/main/java/net/minecraft/world/entity/monster/EnderMan.java b/src/main/java/net/minecraft/world/entity/monster/EnderMan.java
index e1e220b3e4967590a2a77370e2a6ab919ad50eaa..5d371a3e94720e24058d007474355af6aeb7cbdd 100644
--- a/src/main/java/net/minecraft/world/entity/monster/EnderMan.java
+++ b/src/main/java/net/minecraft/world/entity/monster/EnderMan.java
@@ -312,11 +312,17 @@ public class EnderMan extends Monster implements NeutralMob {
     private boolean teleport(double x, double y, double z) {
         BlockPos.MutableBlockPos blockposition_mutableblockposition = new BlockPos.MutableBlockPos(x, y, z);
 
-        while (blockposition_mutableblockposition.getY() > this.level.getMinBuildHeight() && !this.level.getBlockState(blockposition_mutableblockposition).getMaterial().blocksMotion()) {
+        // Airplane start - single chunk lookup
+        net.minecraft.world.level.chunk.LevelChunk chunk = this.level.getChunkIfLoaded(blockposition_mutableblockposition);
+        if (chunk == null) {
+            return false;
+        }
+        // Airplane end
+        while (blockposition_mutableblockposition.getY() > this.level.getMinBuildHeight() && !chunk.getBlockState(blockposition_mutableblockposition).getMaterial().blocksMotion()) { // Airplane
             blockposition_mutableblockposition.move(Direction.DOWN);
         }
 
-        BlockState iblockdata = this.level.getBlockState(blockposition_mutableblockposition);
+        BlockState iblockdata = chunk.getBlockState(blockposition_mutableblockposition); // Airplane
         boolean flag = iblockdata.getMaterial().blocksMotion();
         boolean flag1 = iblockdata.getFluidState().is((Tag) FluidTags.WATER);