Player move optimization.

api/src/main/java/net/jitse/npclib/internal/SimpleNPC.java

@@ -13,6 +13,7 @@ import net.jitse.npclib.api.events.NPCShowEvent;
 import net.jitse.npclib.api.skin.Skin;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
+import org.bukkit.World;
 import org.bukkit.entity.Player;
 import org.bukkit.util.Vector;
 
@@ -104,6 +105,11 @@ public abstract class SimpleNPC implements NPC, PacketHandler {
         return location;
     }
 
+    @Override
+    public World getWorld() {
+        return location != null ? location.getWorld() : null;
+    }
+
     public int getEntityId() {
         return entityId;
     }