From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Martijn Muijsers <martijnmuijsers@live.nl>
Date: Wed, 30 Nov 2022 21:02:43 +0100
Subject: [PATCH] Replace class map with optimized collection

License: LGPL-3.0 (https://www.gnu.org/licenses/lgpl-3.0.html)
Gale - https://galemc.org

This patch is based on the following mixin:
"me/jellysquid/mods/lithium/mixin/collections/entity_by_type/TypeFilterableListMixin.java"
By: 2No2Name <2No2Name@web.de>
As part of: Lithium (https://github.com/CaffeineMC/lithium-fabric)
Licensed under: LGPL-3.0 (https://www.gnu.org/licenses/lgpl-3.0.html)

diff --git a/src/main/java/net/minecraft/util/ClassInstanceMultiMap.java b/src/main/java/net/minecraft/util/ClassInstanceMultiMap.java
index 038710ba934a9a57815dfe9f414b98223b848385..f1a288b6a29f3ba31e2364a9bc412c5e939b6ef7 100644
--- a/src/main/java/net/minecraft/util/ClassInstanceMultiMap.java
+++ b/src/main/java/net/minecraft/util/ClassInstanceMultiMap.java
@@ -14,7 +14,7 @@ import java.util.Map.Entry;
 import net.minecraft.Util;
 
 public class ClassInstanceMultiMap<T> extends AbstractCollection<T> {
-    private final Map<Class<?>, List<T>> byClass = Maps.newHashMap();
+    private final Map<Class<?>, List<T>> byClass = new it.unimi.dsi.fastutil.objects.Reference2ReferenceOpenHashMap<>(2); // Gale - Lithium - replace class map with optimized collection
     private final Class<T> baseClass;
     private final List<T> allInstances = Lists.newArrayList();