PaperMC/CraftBukkit-Patches/0020-Faster-UUID-for-entities.patch

From 91fc1d0f8ae1695094f95e8a3bfc4c3975623bc5 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 3e3d935..a3a8750 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -138,7 +138,7 @@ public abstract class Entity {
         this.random = new Random();
         this.maxFireTicks = 1;
         this.justCreated = true;
-        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);
-- 
1.8.3.2