Major performance improvements.

src/main/java/com/songoda/ultimatestacker/entity/EntityStackManager.java

@@ -25,7 +25,7 @@ public class EntityStackManager {
 
     public EntityStack addStack(UUID uuid, int amount) {
         EntityStack stack = new EntityStack(uuid, amount);
-        stacks.put(uuid, new EntityStack(uuid, amount));
+        stacks.put(uuid, stack);
         return stack;
     }
 
@@ -36,7 +36,7 @@ public class EntityStackManager {
             if (!name.contains(":")) return null;
             String split = name.split(":")[0];
             int amount = Methods.isInt(split) ? Integer.parseInt(split) : 0;
-            addStack(entity, amount);
+            return addStack(entity, amount);
         }
         return null;
     }

src/main/java/com/songoda/ultimatestacker/utils/CachedChunk.java

@@ -2,7 +2,9 @@ package com.songoda.ultimatestacker.utils;
 
 import org.bukkit.Bukkit;
 import org.bukkit.Chunk;
+import org.bukkit.Location;
 import org.bukkit.World;
+import org.bukkit.entity.Entity;
 
 import java.util.Objects;
 
@@ -16,6 +18,10 @@ public class CachedChunk {
         this(chunk.getWorld().getName(), chunk.getX(), chunk.getZ());
     }
 
+    public CachedChunk(Location location) {
+        this(location.getWorld().getName(), (int)location.getX() >> 4, (int)location.getZ() >> 4);
+    }
+
     public CachedChunk(String world, int x, int z) {
         this.world = world;
         this.x = x;
@@ -41,6 +47,13 @@ public class CachedChunk {
         return world.getChunkAt(this.x, this.z);
     }
 
+    public Entity[] getEntities() {
+        if (!Bukkit.getWorld(world).isChunkLoaded(x, z)) {
+            return new Entity[0];
+        }
+        return getChunk().getEntities();
+    }
+
     @Override
     public boolean equals(Object o) {
         if (o instanceof Chunk) {