From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: tr7zw <tr7zw@live.de>
Date: Thu, 25 Jun 2020 23:40:12 +0200
Subject: [PATCH] Heavily optimize furnance fuel and recipe lookups

Co-authored-by: Mykyta Komarn <nkomarn@hotmail.com>

diff --git a/src/main/java/net/minecraft/server/TileEntityFurnace.java b/src/main/java/net/minecraft/server/TileEntityFurnace.java
index 76ea1d003b43d822e2b85eec3b8740155efd531a..c1d1ce582c94fd20f42b1979d6edbb6b377adff8 100644
--- a/src/main/java/net/minecraft/server/TileEntityFurnace.java
+++ b/src/main/java/net/minecraft/server/TileEntityFurnace.java
@@ -299,7 +299,10 @@ public abstract class TileEntityFurnace extends TileEntityContainer implements I
                     this.cookTime = MathHelper.clamp(this.cookTime - 2, 0, this.cookTimeTotal);
                 }
             } else {
-                IRecipe irecipe = this.world.getCraftingManager().craft((Recipes<RecipeCooking>) this.c, this, this.world).orElse(null); // Eclipse fail
+                // Yatopia start - used cached recipe if possible, otherwise look up
+                IRecipe irecipe = getCurrentRecipe();
+                if (irecipe == null) irecipe = this.world.getCraftingManager().craft((Recipes<RecipeCooking>) this.c, this, this.world).orElse(null); // Eclipse fail
+                // Yatopia end
 
                 if (!this.isBurning() && this.canBurn(irecipe)) {
                     // CraftBukkit start
@@ -627,4 +630,18 @@ public abstract class TileEntityFurnace extends TileEntityContainer implements I
         }
 
     }
+
+    // Yatopia start - cache recipe
+    private IRecipe cachedRecipe = null;
+
+    @Override
+    public IRecipe getCurrentRecipe() {
+        return cachedRecipe;
+    }
+
+    @Override
+    public void setCurrentRecipe(IRecipe recipe) {
+        cachedRecipe = recipe;
+    }
+    // Yatopia end
 }