[Bleeding] Changed event system into a new, much faster design. Huge thanks to @zml2008 & @lahwran.

src/main/java/org/bukkit/event/entity/CreatureSpawnEvent.java

@@ -4,6 +4,7 @@ import org.bukkit.entity.CreatureType;
 import org.bukkit.entity.Entity;
 import org.bukkit.Location;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 
 /**
  * Called when a creature is spawned into a world.
@@ -12,6 +13,7 @@ import org.bukkit.event.Cancellable;
  */
 @SuppressWarnings("serial")
 public class CreatureSpawnEvent extends EntityEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
 
     private Location location;
     private boolean canceled;
@@ -60,6 +62,15 @@ public class CreatureSpawnEvent extends EntityEvent implements Cancellable {
         return spawnReason;
     }
 
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+
     /**
      * An enum to specify the type of spawning
      */