From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: violetc <58360096+s-yh-china@users.noreply.github.com>
Date: Mon, 15 Aug 2022 17:17:24 +0800
Subject: [PATCH] Skip cloning loot parameters

This patch is Powered by Pufferfish(https://github.com/pufferfish-gg/Pufferfish)

diff --git a/src/main/java/net/minecraft/world/level/storage/loot/LootContext.java b/src/main/java/net/minecraft/world/level/storage/loot/LootContext.java
index 35f9b11a3a61976c952a2c1c64bb2a932538f54f..5d678cfca0a39aeed0881c3a38828fdc4bf2d524 100644
--- a/src/main/java/net/minecraft/world/level/storage/loot/LootContext.java
+++ b/src/main/java/net/minecraft/world/level/storage/loot/LootContext.java
@@ -41,8 +41,15 @@ public class LootContext {
         this.level = world;
         this.lootTables = tableGetter;
         this.conditions = conditionGetter;
-        this.params = ImmutableMap.copyOf(parameters);
-        this.dynamicDrops = ImmutableMap.copyOf(drops);
+        // Leaves start - use unmodifiable maps instead of immutable ones to skip the copy
+        if (top.leavesmc.leaves.LeavesConfig.skipCloneLootParameters) {
+            this.params = java.util.Collections.unmodifiableMap(parameters);
+            this.dynamicDrops = java.util.Collections.unmodifiableMap(drops);
+        } else {
+            this.params = ImmutableMap.copyOf(parameters);
+            this.dynamicDrops = ImmutableMap.copyOf(drops);
+        }
+        // Leaves end - use unmodifiable maps instead of immutable ones to skip the copy
     }
 
     public boolean hasParam(LootContextParam<?> parameter) {
diff --git a/src/main/java/top/leavesmc/leaves/LeavesConfig.java b/src/main/java/top/leavesmc/leaves/LeavesConfig.java
index 111787b63f67b1fdcac559faf1cc0eb7d6f0984e..1e7b428f4e8fef77bdc8eae43216fe113484fdcc 100644
--- a/src/main/java/top/leavesmc/leaves/LeavesConfig.java
+++ b/src/main/java/top/leavesmc/leaves/LeavesConfig.java
@@ -293,6 +293,11 @@ public final class LeavesConfig {
         throttleInactiveGoalSelectorTick = getBoolean("settings.performance.inactive-goal-selector-disable", throttleInactiveGoalSelectorTick);
     }
 
+    public static boolean skipCloneLootParameters = true;
+    private static void skipCloneLootParameters() {
+        skipCloneLootParameters = getBoolean("settings.performance.skip-clone-loot-parameters", skipCloneLootParameters);
+    }
+
     public static final class WorldConfig {
 
         public final String worldName;