From 60296cc1c22442741c5d031180253ba0d3c285d8 Mon Sep 17 00:00:00 2001
From: Alfie Cleveland <alfeh@me.com>
Date: Wed, 5 Jul 2017 16:09:01 +0100
Subject: [PATCH] Target selection optimizations


diff --git a/src/main/java/net/minecraft/server/EntityCreature.java b/src/main/java/net/minecraft/server/EntityCreature.java
index 3810671e6..4af862210 100644
--- a/src/main/java/net/minecraft/server/EntityCreature.java
+++ b/src/main/java/net/minecraft/server/EntityCreature.java
@@ -63,6 +63,11 @@ public abstract class EntityCreature extends EntityInsentient {
     }
     // Poweruser end
 
+    // MineHQ start
+    private long lastRayTraceTick = -1L;
+    private boolean lastRayTraceResult = false;
+    // MineHQ end
+
     public EntityCreature(World world) {
         super(world);
     }
@@ -106,7 +111,14 @@ public abstract class EntityCreature extends EntityInsentient {
         } else if (this.target.isAlive()) {
             float f1 = this.target.e((Entity) this);
 
-            if (this.hasLineOfSight(this.target)) {
+            // MineHQ start - don't constantly ray trace
+            if (this.lastRayTraceTick + 50 < this.ticksLived) {
+                this.lastRayTraceTick = this.ticksLived;
+                this.lastRayTraceResult = this.hasLineOfSight(this.target);
+            }
+
+            if (this.lastRayTraceResult) {
+            // MineHQ end
                 this.a(this.target, f1);
             }
         } else {
diff --git a/src/main/java/net/minecraft/server/EntityMonster.java b/src/main/java/net/minecraft/server/EntityMonster.java
index df54f1424..123cc0d83 100644
--- a/src/main/java/net/minecraft/server/EntityMonster.java
+++ b/src/main/java/net/minecraft/server/EntityMonster.java
@@ -41,7 +41,15 @@ public abstract class EntityMonster extends EntityCreature implements IMonster {
         return "game.hostile.swim.splash";
     }
 
+    private long lastTargetSearchTick = -1L; // MineHQ
     protected Entity findTarget() {
+        // MineHQ start
+        if (this.lastTargetSearchTick + 50 < this.ticksLived) {
+            this.lastTargetSearchTick = this.ticksLived;
+        } else {
+            return null;
+        }
+        // MineHQ end
         EntityHuman entityhuman = this.world.findNearbyVulnerablePlayer(this, 16.0D);
 
         return entityhuman != null && this.hasLineOfSight(entityhuman) ? entityhuman : null;
-- 
2.13.3