diff --git a/src/pocketmine/block/Bed.php b/src/pocketmine/block/Bed.php
index b9fb1e060..fccd98fcc 100644
--- a/src/pocketmine/block/Bed.php
+++ b/src/pocketmine/block/Bed.php
@@ -36,7 +36,11 @@ class Bed extends Transparent{
 	}
 
 	public function getBoundingBox(){
-		return new AxisAlignedBB(
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x,
 			$this->y,
 			$this->z,
diff --git a/src/pocketmine/block/Block.php b/src/pocketmine/block/Block.php
index d53602eb0..d7ca18d93 100644
--- a/src/pocketmine/block/Block.php
+++ b/src/pocketmine/block/Block.php
@@ -513,6 +513,7 @@ class Block extends Position implements Metadatable{
 	protected $name = "Unknown";
 	protected $breakTime = 0.20;
 	protected $hardness = 10;
+	protected $boundingBox = null;
 	public $hasEntityCollision = false;
 	public $isActivable = false;
 	public $breakable = true;
@@ -820,6 +821,7 @@ class Block extends Position implements Metadatable{
 		$this->y = (int) $v->y;
 		$this->z = (int) $v->z;
 		$this->level = $v->level;
+		$this->boundingBox = null;
 	}
 
 	/**
@@ -898,7 +900,11 @@ class Block extends Position implements Metadatable{
 	 * @return AxisAlignedBB
 	 */
 	public function getBoundingBox(){
-		return new AxisAlignedBB(
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x,
 			$this->y,
 			$this->z,
diff --git a/src/pocketmine/block/Cactus.php b/src/pocketmine/block/Cactus.php
index 9d2b1e401..e2eaa2d06 100644
--- a/src/pocketmine/block/Cactus.php
+++ b/src/pocketmine/block/Cactus.php
@@ -43,7 +43,11 @@ class Cactus extends Transparent{
 	}
 
 	public function getBoundingBox(){
-		return new AxisAlignedBB(
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x + 0.0625,
 			$this->y,
 			$this->z + 0.0625,
diff --git a/src/pocketmine/block/Cake.php b/src/pocketmine/block/Cake.php
index bd7e5145c..0f98dc373 100644
--- a/src/pocketmine/block/Cake.php
+++ b/src/pocketmine/block/Cake.php
@@ -38,9 +38,13 @@ class Cake extends Transparent{
 	}
 
 	public function getBoundingBox(){
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
 		$f = (1 + $this->getDamage() * 2) / 16;
 
-		return new AxisAlignedBB(
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x + $f,
 			$this->y,
 			$this->z + 0.0625,
diff --git a/src/pocketmine/block/Carpet.php b/src/pocketmine/block/Carpet.php
index 1786ce36a..dc51e0e63 100644
--- a/src/pocketmine/block/Carpet.php
+++ b/src/pocketmine/block/Carpet.php
@@ -54,7 +54,11 @@ class Carpet extends Flowable{
 	}
 
 	public function getBoundingBox(){
-		return new AxisAlignedBB(
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x,
 			$this->y,
 			$this->z,
diff --git a/src/pocketmine/block/Chest.php b/src/pocketmine/block/Chest.php
index c127ed952..d053f4d1b 100644
--- a/src/pocketmine/block/Chest.php
+++ b/src/pocketmine/block/Chest.php
@@ -43,7 +43,11 @@ class Chest extends Transparent{
 	}
 
 	public function getBoundingBox(){
-		return new AxisAlignedBB(
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x + 0.0625,
 			$this->y,
 			$this->z + 0.0625,
diff --git a/src/pocketmine/block/Door.php b/src/pocketmine/block/Door.php
index 88db0adf6..a28598740 100644
--- a/src/pocketmine/block/Door.php
+++ b/src/pocketmine/block/Door.php
@@ -53,6 +53,10 @@ abstract class Door extends Transparent{
 	}
 
 	public function getBoundingBox(){
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
 		$f = 0.1875;
 		$damage = $this->getFullDamage();
 
@@ -195,7 +199,7 @@ abstract class Door extends Transparent{
 			}
 		}
 
-		return $bb;
+		return $this->boundingBox = $bb;
 	}
 
 	public function onUpdate($type){
diff --git a/src/pocketmine/block/EndPortal.php b/src/pocketmine/block/EndPortal.php
index 7a12da12a..46eaefeb6 100644
--- a/src/pocketmine/block/EndPortal.php
+++ b/src/pocketmine/block/EndPortal.php
@@ -30,7 +30,11 @@ class EndPortal extends Solid{
 	}
 
 	public function getBoundingBox(){
-		return new AxisAlignedBB(
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x,
 			$this->y,
 			$this->z,
diff --git a/src/pocketmine/block/Farmland.php b/src/pocketmine/block/Farmland.php
index 49c3217c1..ec170171a 100644
--- a/src/pocketmine/block/Farmland.php
+++ b/src/pocketmine/block/Farmland.php
@@ -31,7 +31,11 @@ class Farmland extends Solid{
 	}
 
 	public function getBoundingBox(){
-		return new AxisAlignedBB(
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x,
 			$this->y,
 			$this->z,
diff --git a/src/pocketmine/block/Fence.php b/src/pocketmine/block/Fence.php
index aff403b33..5ff6694b0 100644
--- a/src/pocketmine/block/Fence.php
+++ b/src/pocketmine/block/Fence.php
@@ -32,6 +32,10 @@ class Fence extends Transparent{
 	}
 
 	public function getBoundingBox(){
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
 		$flag = $this->canConnect($this->getSide(2));
 		$flag1 = $this->canConnect($this->getSide(3));
 		$flag2 = $this->canConnect($this->getSide(4));
@@ -42,7 +46,7 @@ class Fence extends Transparent{
 		$f2 = $flag ? 0 : 0.375;
 		$f3 = $flag1 ? 1 : 0.625;
 
-		return new AxisAlignedBB(
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x + $f,
 			$this->y,
 			$this->z + $f2,
diff --git a/src/pocketmine/block/FenceGate.php b/src/pocketmine/block/FenceGate.php
index 9e144b55c..2d8f6a235 100644
--- a/src/pocketmine/block/FenceGate.php
+++ b/src/pocketmine/block/FenceGate.php
@@ -39,13 +39,17 @@ class FenceGate extends Transparent{
 
 
 	public function getBoundingBox(){
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
 		if(($this->getDamage() & 0x04) > 0){
 			return null;
 		}
 
 		$i = ($this->getDamage() & 0x03);
 		if($i === 2 and $i === 0){
-			return new AxisAlignedBB(
+			return $this->boundingBox = new AxisAlignedBB(
 				$this->x,
 				$this->y,
 				$this->z + 0.375,
@@ -54,7 +58,7 @@ class FenceGate extends Transparent{
 				$this->z + 0.625
 			);
 		}else{
-			return new AxisAlignedBB(
+			return $this->boundingBox = new AxisAlignedBB(
 				$this->x + 0.375,
 				$this->y,
 				$this->z,
diff --git a/src/pocketmine/block/Ladder.php b/src/pocketmine/block/Ladder.php
index 71cf358a0..3ce78534e 100644
--- a/src/pocketmine/block/Ladder.php
+++ b/src/pocketmine/block/Ladder.php
@@ -44,10 +44,14 @@ class Ladder extends Transparent{
 	}
 
 	public function getBoundingBox(){
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
 		$f = 0.125;
 
 		if($this->meta === 2){
-			return new AxisAlignedBB(
+			return $this->boundingBox = new AxisAlignedBB(
 				$this->x,
 				$this->y,
 				$this->z + 1 - $f,
@@ -56,7 +60,7 @@ class Ladder extends Transparent{
 				$this->z + 1
 			);
 		}elseif($this->meta === 3){
-			return new AxisAlignedBB(
+			return $this->boundingBox = new AxisAlignedBB(
 				$this->x,
 				$this->y,
 				$this->z,
@@ -65,7 +69,7 @@ class Ladder extends Transparent{
 				$this->z + $f
 			);
 		}elseif($this->meta === 4){
-			return new AxisAlignedBB(
+			return $this->boundingBox = new AxisAlignedBB(
 				$this->x + 1 - $f,
 				$this->y,
 				$this->z,
@@ -74,7 +78,7 @@ class Ladder extends Transparent{
 				$this->z + 1
 			);
 		}elseif($this->meta === 5){
-			return new AxisAlignedBB(
+			return $this->boundingBox = new AxisAlignedBB(
 				$this->x,
 				$this->y,
 				$this->z,
diff --git a/src/pocketmine/block/Lava.php b/src/pocketmine/block/Lava.php
index b1bcbadb6..726844205 100644
--- a/src/pocketmine/block/Lava.php
+++ b/src/pocketmine/block/Lava.php
@@ -36,10 +36,6 @@ class Lava extends Liquid{
 		$this->hardness = 0;
 	}
 
-	public function getBoundingBox(){
-		return null;
-	}
-
 	public function onEntityCollide(Entity $entity){
 		$entity->fallDistance *= 0.5;
 		$ev = new EntityDamageByBlockEvent($this, $entity, EntityDamageEvent::CAUSE_LAVA, 4);
diff --git a/src/pocketmine/block/Liquid.php b/src/pocketmine/block/Liquid.php
index 4813f4aaf..96c173939 100644
--- a/src/pocketmine/block/Liquid.php
+++ b/src/pocketmine/block/Liquid.php
@@ -414,4 +414,8 @@ abstract class Liquid extends Transparent{
 			}
 		}
 	}
+
+	public function getBoundingBox(){
+		return null;
+	}
 }
\ No newline at end of file
diff --git a/src/pocketmine/block/Slab.php b/src/pocketmine/block/Slab.php
index 76137e929..241f62d80 100644
--- a/src/pocketmine/block/Slab.php
+++ b/src/pocketmine/block/Slab.php
@@ -48,8 +48,12 @@ class Slab extends Transparent{
 	}
 
 	public function getBoundingBox(){
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
 		if(($this->meta & 0x08) > 0){
-			return new AxisAlignedBB(
+			return $this->boundingBox = new AxisAlignedBB(
 				$this->x,
 				$this->y + 0.5,
 				$this->z,
@@ -58,7 +62,7 @@ class Slab extends Transparent{
 				$this->z + 1
 			);
 		}else{
-			return new AxisAlignedBB(
+			return $this->boundingBox = new AxisAlignedBB(
 				$this->x,
 				$this->y,
 				$this->z,
diff --git a/src/pocketmine/block/SoulSand.php b/src/pocketmine/block/SoulSand.php
index 9e4f6cd71..cde302304 100644
--- a/src/pocketmine/block/SoulSand.php
+++ b/src/pocketmine/block/SoulSand.php
@@ -31,7 +31,11 @@ class SoulSand extends Solid{
 	}
 
 	public function getBoundingBox(){
-		return new AxisAlignedBB(
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x,
 			$this->y,
 			$this->z,
diff --git a/src/pocketmine/block/Stair.php b/src/pocketmine/block/Stair.php
index f84a0d9e9..74afea529 100644
--- a/src/pocketmine/block/Stair.php
+++ b/src/pocketmine/block/Stair.php
@@ -114,8 +114,12 @@ abstract class Stair extends Transparent{
 	*/
 
 	public function getBoundingBox(){
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
 		if(($this->getDamage() & 0x04) > 0){
-			return new AxisAlignedBB(
+			return $this->boundingBox = new AxisAlignedBB(
 				$this->x,
 				$this->y + 0.5,
 				$this->z,
@@ -124,7 +128,7 @@ abstract class Stair extends Transparent{
 				$this->z + 1
 			);
 		}else{
-			return new AxisAlignedBB(
+			return $this->boundingBox = new AxisAlignedBB(
 				$this->x,
 				$this->y,
 				$this->z,
diff --git a/src/pocketmine/block/StillLava.php b/src/pocketmine/block/StillLava.php
index 978d0db15..57195c2ac 100644
--- a/src/pocketmine/block/StillLava.php
+++ b/src/pocketmine/block/StillLava.php
@@ -27,8 +27,4 @@ class StillLava extends Lava{
 		$this->hardness = 500;
 	}
 
-	public function getBoundingBox(){
-		return null;
-	}
-
 }
\ No newline at end of file
diff --git a/src/pocketmine/block/StoneWall.php b/src/pocketmine/block/StoneWall.php
index 23f758c97..8abf9688a 100644
--- a/src/pocketmine/block/StoneWall.php
+++ b/src/pocketmine/block/StoneWall.php
@@ -37,6 +37,10 @@ class StoneWall extends Transparent{
 	}
 
 	public function getBoundingBox(){
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
 		$flag = $this->canConnect($this->getSide(2));
 		$flag1 = $this->canConnect($this->getSide(3));
 		$flag2 = $this->canConnect($this->getSide(4));
@@ -58,7 +62,7 @@ class StoneWall extends Transparent{
 			$f3 = 0.6875;
 		}
 
-		return new AxisAlignedBB(
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x + $f,
 			$this->y,
 			$this->z + $f2,
diff --git a/src/pocketmine/block/Thin.php b/src/pocketmine/block/Thin.php
index 3ee911a14..dd621ec7a 100644
--- a/src/pocketmine/block/Thin.php
+++ b/src/pocketmine/block/Thin.php
@@ -30,6 +30,10 @@ abstract class Thin extends Transparent{
 	public $isSolid = false;
 
 	public function getBoundingBox(){
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
 		$f = 0.4375;
 		$f1 = 0.5625;
 		$f2 = 0.4375;
@@ -62,7 +66,7 @@ abstract class Thin extends Transparent{
 			$f3 = 1;
 		}
 
-		return new AxisAlignedBB(
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x + $f,
 			$this->y,
 			$this->z + $f2,
diff --git a/src/pocketmine/block/Trapdoor.php b/src/pocketmine/block/Trapdoor.php
index 71719bb61..d6093df8c 100644
--- a/src/pocketmine/block/Trapdoor.php
+++ b/src/pocketmine/block/Trapdoor.php
@@ -38,6 +38,10 @@ class Trapdoor extends Transparent{
 	}
 
 	public function getBoundingBox(){
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
 		$damage = $this->getDamage();
 
 		$f = 0.1875;
@@ -104,7 +108,7 @@ class Trapdoor extends Transparent{
 			}
 		}
 
-		return $bb;
+		return $this->boundingBox = $bb;
 	}
 
 	public function place(Item $item, Block $block, Block $target, $face, $fx, $fy, $fz, Player $player = null){
diff --git a/src/pocketmine/block/Vine.php b/src/pocketmine/block/Vine.php
index d7b2e5ba3..f58196204 100644
--- a/src/pocketmine/block/Vine.php
+++ b/src/pocketmine/block/Vine.php
@@ -44,6 +44,10 @@ class Vine extends Transparent{
 	}
 
 	public function getBoundingBox(){
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
 		$f1 = 1;
 		$f2 = 1;
 		$f3 = 1;
@@ -92,7 +96,7 @@ class Vine extends Transparent{
 			$f6 = 1;
 		}
 
-		return new AxisAlignedBB(
+		return $this->boundingBox = new AxisAlignedBB(
 			$this->x + $f1,
 			$this->y + $f2,
 			$this->z + $f3,
diff --git a/src/pocketmine/block/Water.php b/src/pocketmine/block/Water.php
index 1881a0e0f..e80d1e3a4 100644
--- a/src/pocketmine/block/Water.php
+++ b/src/pocketmine/block/Water.php
@@ -30,10 +30,6 @@ class Water extends Liquid{
 		parent::__construct(self::WATER, $meta, "Water");
 		$this->hardness = 500;
 	}
-
-	public function getBoundingBox(){
-		return null;
-	}
 	
 	public function onEntityCollide(Entity $entity){
 		$entity->fallDistance = 0;
diff --git a/src/pocketmine/block/WoodSlab.php b/src/pocketmine/block/WoodSlab.php
index 73e180adf..e3d38d964 100644
--- a/src/pocketmine/block/WoodSlab.php
+++ b/src/pocketmine/block/WoodSlab.php
@@ -46,8 +46,12 @@ class WoodSlab extends Transparent{
 	}
 
 	public function getBoundingBox(){
+		if($this->boundingBox !== null){
+			return $this->boundingBox;
+		}
+
 		if(($this->meta & 0x08) > 0){
-			return new AxisAlignedBB(
+			return $this->boundingBox = new AxisAlignedBB(
 				$this->x,
 				$this->y + 0.5,
 				$this->z,
@@ -56,7 +60,7 @@ class WoodSlab extends Transparent{
 				$this->z + 1
 			);
 		}else{
-			return new AxisAlignedBB(
+			return $this->boundingBox = new AxisAlignedBB(
 				$this->x,
 				$this->y,
 				$this->z,