papermc/CraftBukkit-Patches/0031-Faster-UUID-for-entities.patch

From 25514a2f378763e974783799c57dee62c67c1d20 Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Sun, 17 Mar 2013 19:02:50 +1100
Subject: [PATCH] Faster UUID for entities

It is overkill to create a new SecureRandom on each entity create and then use it to make a new Entity ID for every entity instance created. Instead we will just use a pseudo random UUID based off the random instance we already have.

diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 401edcc..a2a4f5a 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -154,7 +154,7 @@ public abstract class Entity {
         this.ai = false;
         this.as = 0;
         this.invulnerable = false;
-        this.uniqueID = UUID.randomUUID();
+        this.uniqueID = new UUID(random.nextLong(), random.nextLong()); // Spigot
         this.at = EnumEntitySize.SIZE_2;
         this.world = world;
         this.setPosition(0.0D, 0.0D, 0.0D);
-- 
1.8.1.2