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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sat, 11 Jan 2020 21:50:56 -0800
Subject: [PATCH] Optimise EntityGetter#getPlayerByUUID

Use the PlayerList map instead of iterating over all players

diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 6351a5560975803fb0b0e915493702f4a837660c..1efc5554e422d4c4c4df3aae768920e06bfd6674 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -328,6 +328,15 @@ public class ServerLevel extends Level implements WorldGenLevel {
     }
     // Paper end
 
+    // Paper start - optimise getPlayerByUUID
+    @Nullable
+    @Override
+    public Player getPlayerByUUID(UUID uuid) {
+        final Player player = this.getServer().getPlayerList().getPlayer(uuid);
+        return player != null && player.level() == this ? player : null;
+    }
+    // Paper end - optimise getPlayerByUUID
+
     // Add env and gen to constructor, IWorldDataServer -> WorldDataServer
     public ServerLevel(MinecraftServer minecraftserver, Executor executor, LevelStorageSource.LevelStorageAccess convertable_conversionsession, PrimaryLevelData iworlddataserver, ResourceKey<Level> resourcekey, LevelStem worlddimension, ChunkProgressListener worldloadlistener, boolean flag, long i, List<CustomSpawner> list, boolean flag1, @Nullable RandomSequences randomsequences, org.bukkit.World.Environment env, org.bukkit.generator.ChunkGenerator gen, org.bukkit.generator.BiomeProvider biomeProvider) {
         // IRegistryCustom.Dimension iregistrycustom_dimension = minecraftserver.registryAccess(); // CraftBukkit - decompile error