Sped up teleporting even more, + fixed isSneaking

src/main/java/net/minecraft/server/PlayerManager.java

@@ -127,27 +127,16 @@ public class PlayerManager {
             int j1 = j - l;
 
             // Craftbukkit start
-            if (!this.a(i, j, k, l)) {
-                this.a(i, j, true).a(entityplayer);
-            }
-
-            if (!this.a(i - i1, j - j1, i, j)) {
-                PlayerInstance playerinstance = this.a(i - i1, j - j1, false);
-
-                if (playerinstance != null) {
-                    playerinstance.b(entityplayer);
-                }
+            if (i1 > 10 || i1 < -10 || j1 > 10 || j1 < -10) {
+                b(entityplayer);
+                a(entityplayer);
+                return;
             }
             // Craftbukkit end
 
             if (i1 != 0 || j1 != 0) {
                 for (int k1 = i - 10; k1 <= i + 10; ++k1) {
                     for (int l1 = j - 10; l1 <= j + 10; ++l1) {
-                        // Craftbukkit start
-                        if ((k1 == i) && (l1 == j)) {
-                            continue;
-                        }
-                        // Craftbukkit end
                         if (!this.a(k1, l1, k, l)) {
                             this.a(k1, l1, true).a(entityplayer);
                         }

src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java

@@ -170,9 +170,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
             entity.a.e = newEntity;
             entity = newEntity;
         } else {
-            oldWorld.manager.b(entity);
             entity.a.a(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
-            newWorld.manager.a(entity);
         }
     }
 
@@ -181,7 +179,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     }
 
     public boolean isSneaking() {
-        return entity.J();
+        return entity.U();
     }
     
     public void updateInventory() {