diff --git a/src/main/java/net/server/Server.java b/src/main/java/net/server/Server.java
index 2a3f4c4921..e03a42caf1 100644
--- a/src/main/java/net/server/Server.java
+++ b/src/main/java/net/server/Server.java
@@ -139,7 +139,7 @@ public class Server {
     private final AtomicLong currentTime = new AtomicLong(0);
     private long serverCurrentTime = 0;
 
-    private boolean availableDeveloperRoom = false;
+    private volatile boolean availableDeveloperRoom = false;
     private boolean online = false;
     public static long uptime = System.currentTimeMillis();
 
@@ -827,7 +827,6 @@ public class Server {
     public void init() {
         Instant beforeInit = Instant.now();
         log.info("Cosmic v{} starting up.", ServerConstants.VERSION);
-        final ExecutorService initExecutor = Executors.newFixedThreadPool(10);
 
         if (YamlConfig.config.server.SHUTDOWNHOOK) {
             Runtime.getRuntime().addShutdownHook(new Thread(shutdown(false)));
@@ -853,12 +852,14 @@ public class Server {
             throw new IllegalStateException(sqle);
         }
 
+        final ExecutorService initExecutor = Executors.newFixedThreadPool(10);
         // Run slow operations asynchronously to make startup faster
         final List<Future<?>> futures = new ArrayList<>();
         futures.add(initExecutor.submit(() -> SkillFactory.loadAllSkills()));
         futures.add(initExecutor.submit(() -> CashItemFactory.loadAllCashItems()));
         futures.add(initExecutor.submit(() -> MapleQuest.loadAllQuests()));
         futures.add(initExecutor.submit(() -> MapleSkillbookInformationProvider.loadAllSkillbookInformation()));
+        futures.add(initExecutor.submit(() -> MaplePlayerNPCFactory.loadFactoryMetadata()));
 
         ThreadManager.getInstance().start();
         initializeTimelyTasks();    // aggregated method for timely tasks thanks to lxconan
@@ -877,7 +878,6 @@ public class Server {
             }
             initWorldPlayerRanking();
 
-            MaplePlayerNPCFactory.loadFactoryMetadata();
             loadPlayerNpcMapStepFromDb();
         } catch (Exception e) {
             e.printStackTrace();//For those who get errors
diff --git a/src/main/java/server/life/MaplePlayerNPCFactory.java b/src/main/java/server/life/MaplePlayerNPCFactory.java
index ea8da0658f..e769f52b8a 100644
--- a/src/main/java/server/life/MaplePlayerNPCFactory.java
+++ b/src/main/java/server/life/MaplePlayerNPCFactory.java
@@ -19,17 +19,18 @@
 */
 package server.life;
 
-import java.io.File;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.List;
-import java.util.LinkedList;
 import net.server.Server;
 import provider.MapleData;
 import provider.MapleDataProvider;
 import provider.MapleDataProviderFactory;
 import provider.MapleDataTool;
 
+import java.io.File;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+
 /**
  *
  * @author RonanLana
@@ -41,11 +42,11 @@ public class MaplePlayerNPCFactory {
     private static final Map<Integer, List<MaplePlayerNPC>> dnpcMaps = new HashMap<>();
     private static Integer runningDeveloperOid = 2147483000;  // 647 slots, long enough
     
-    public static boolean isExistentScriptid(int scriptid) {
+    public synchronized static boolean isExistentScriptid(int scriptid) {
         return npcData.getData(scriptid + ".img") != null;
     }
     
-    public static void loadDeveloperRoomMetadata(MapleDataProvider npc) {
+    private static void loadDeveloperRoomMetadata(MapleDataProvider npc) {
         MapleData thisData = npc.getData("9977777.img");
         if(thisData != null) {
             MapleDataProvider map = MapleDataProviderFactory.getDataProvider(new File("wz/Map.wz"));
@@ -65,7 +66,7 @@ public class MaplePlayerNPCFactory {
         }
     }
     
-    public static void loadFactoryMetadata() {
+    public synchronized static void loadFactoryMetadata() {
         MapleDataProvider npc = npcData;
         loadDeveloperRoomMetadata(npc);
 
@@ -134,7 +135,7 @@ public class MaplePlayerNPCFactory {
         }
     }
     
-    public static List<MaplePlayerNPC> getDeveloperNpcsFromMapid(int mapid) {
+    public synchronized static List<MaplePlayerNPC> getDeveloperNpcsFromMapid(int mapid) {
         return dnpcMaps.get(mapid);
     }
 }