From ab8e9ba312df771c66db2e4a84895c8ffde3d9ad 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 0328eadf27..4e1fd76bbd 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -382,8 +382,7 @@ public class CraftWorld implements World {
 
     @Override
     public boolean isChunkLoaded(int x, int z) {
-        net.minecraft.server.Chunk chunk = world.getChunkProvider().getChunkAt(x, z, false);
-        return chunk != null;
+        return world.getChunkProvider().getChunkAtIfLoadedImmediately(x, z) != null; // Paper
     }
 
     @Override
-- 
2.21.0