From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: NONPLAYT <76615486+NONPLAYT@users.noreply.github.com>
Date: Sun, 14 Jan 2024 14:50:10 +0300
Subject: [PATCH] vmp: use linked map for entity trackers for faster iteration

Original code by RelativityMC, licensed under MIT
You can find the original code on https://github.com/RelativityMC/VMP-fabric (Yarn mappings)

diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index ecd02b10c4120a7d7342b12ec95be0ee56318333..f5dd325b755beefa159957864ef0d3a381b3af86 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -12,6 +12,7 @@ import com.mojang.datafixers.DataFixer;
 import com.mojang.logging.LogUtils;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectLinkedOpenHashMap; // DivineMC - vmp: use linked map for entity trackers for faster iteration
 import it.unimi.dsi.fastutil.longs.Long2ByteMap;
 import it.unimi.dsi.fastutil.longs.Long2ByteOpenHashMap;
 import it.unimi.dsi.fastutil.longs.Long2LongMap;
@@ -204,7 +205,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
         this.toDrop = new LongOpenHashSet();
         this.tickingGenerated = new AtomicInteger();
         this.playerMap = new PlayerMap();
-        this.entityMap = new Int2ObjectOpenHashMap();
+        this.entityMap = new Int2ObjectLinkedOpenHashMap<>(); // DivineMC - vmp: use linked map for entity trackers for faster iteration
         this.chunkTypeCache = new Long2ByteOpenHashMap();
         this.chunkSaveCooldowns = new Long2LongOpenHashMap();
         // Paper - rewrite chunk system