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 6f9e0560101662012a332c560ce51c00500ce20b..29509d3ae956fd4da2bf12c6a352ab115fc75f5c 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -277,13 +277,13 @@ public class CraftWorld extends CraftRegionAccessor implements World {
 
     @Override
     public boolean isChunkLoaded(int x, int z) {
-        return this.world.getChunkSource().isChunkLoaded(x, z);
+        return this.world.getChunkSource().getChunkAtIfLoadedImmediately(x, z) != null; // Paper
     }
 
     @Override
     public boolean isChunkGenerated(int x, int z) {
         try {
-            return this.isChunkLoaded(x, z) || this.world.getChunkSource().chunkMap.read(new ChunkPos(x, z)) != null;
+            return this.world.getChunkSource().getChunkAtIfCachedImmediately(x, z) != null || this.world.getChunkSource().chunkMap.read(new ChunkPos(x, z)) != null; // Paper (TODO check if the first part can be removed)
         } catch (IOException ex) {
             throw new RuntimeException(ex);
         }