From e8130f30b3ccaa96576a1a9f8ab34ec9e01ff0eb Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 22 Mar 2016 00:33:47 -0400
Subject: [PATCH] Use a Shared Random for Entities

Reduces memory usage and provides ensures more randomness, Especially since a lot of garbage entity objects get created.

diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index e16579116..c0367df20 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -50,6 +50,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
 
     // CraftBukkit start
     private static final int CURRENT_LEVEL = 2;
+    public static Random SHARED_RANDOM = new Random(); // Paper
     static boolean isLevelAtLeast(NBTTagCompound tag, int level) {
         return tag.hasKey("Bukkit.updateLevel") && tag.getInt("Bukkit.updateLevel") >= level;
     }
@@ -182,7 +183,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
         this.length = 1.8F;
         this.aA = 1.0F;
         this.aB = 1.0F;
-        this.random = new Random();
+        this.random = SHARED_RANDOM; // Paper
         this.fireTicks = -this.getMaxFireTicks();
         this.justCreated = true;
         this.uniqueID = MathHelper.a(this.random);
-- 
2.18.0