From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Tue, 21 May 2019 02:34:04 +0100
Subject: [PATCH] improve CraftWorld#isChunkLoaded

getChunkAt will request the chunk using vanillas chunk loading system,
which while we're not going to load the chunk, does involve the server
waiting for the execution queue to get to our request; We can just query
the chunk status and get a response now, vs having to wait

diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 3757ab5a2a0c6282d822c22415cc2861eba2f236..1a198ad238fb92c22a971e6fe540e9834eb65056 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -414,13 +414,13 @@ public class CraftWorld implements World {
 
     @Override
     public boolean isChunkLoaded(int x, int z) {
-        return world.getChunkProvider().isChunkLoaded(x, z);
+        return world.getChunkProvider().getChunkAtIfLoadedImmediately(x, z) != null; // Paper
     }
 
     @Override
     public boolean isChunkGenerated(int x, int z) {
         try {
-            return isChunkLoaded(x, z) || world.getChunkProvider().playerChunkMap.read(new ChunkCoordIntPair(x, z)) != null;
+            return world.getChunkProvider().getChunkAtIfCachedImmediately(x, z) != null || world.getChunkProvider().playerChunkMap.read(new ChunkCoordIntPair(x, z)) != null; // Paper (TODO check if the first part can be removed)
         } catch (IOException ex) {
             throw new RuntimeException(ex);
         }