diff --git a/src/pocketmine/level/format/Chunk.php b/src/pocketmine/level/format/Chunk.php
index 4c3349c15..dd6fa64ec 100644
--- a/src/pocketmine/level/format/Chunk.php
+++ b/src/pocketmine/level/format/Chunk.php
@@ -887,20 +887,31 @@ class Chunk{
 		$stream = new BinaryStream();
 		$stream->putInt($this->x);
 		$stream->putInt($this->z);
-		$count = 0;
-		$subChunks = "";
-		foreach($this->subChunks as $y => $subChunk){
-			if($subChunk instanceof EmptySubChunk){
-				continue;
+		$stream->putByte(($this->lightPopulated ? 4 : 0) | ($this->terrainPopulated ? 2 : 0) | ($this->terrainGenerated ? 1 : 0));
+		if($this->terrainGenerated){
+			//subchunks
+			$count = 0;
+			$subChunks = "";
+			foreach($this->subChunks as $y => $subChunk){
+				if($subChunk instanceof EmptySubChunk){
+					continue;
+				}
+				++$count;
+				$subChunks .= chr($y) . $subChunk->getBlockIdArray() . $subChunk->getBlockDataArray();
+				if($this->lightPopulated){
+					$subChunks .= $subChunk->getBlockSkyLightArray() . $subChunk->getBlockLightArray();
+				}
+			}
+			$stream->putByte($count);
+			$stream->put($subChunks);
+
+			//biomes
+			$stream->put($this->biomeIds);
+			if($this->lightPopulated){
+				$stream->put(pack("v*", ...$this->heightMap));
 			}
-			++$count;
-			$subChunks .= chr($y) . $subChunk->fastSerialize();
 		}
-		$stream->putByte($count);
-		$stream->put($subChunks);
-		$stream->put(pack("v*", ...$this->heightMap) .
-			$this->biomeIds .
-			chr(($this->lightPopulated ? 4 : 0) | ($this->terrainPopulated ? 2 : 0) | ($this->terrainGenerated ? 1 : 0)));
+
 		return $stream->getBuffer();
 	}
 
@@ -916,19 +927,36 @@ class Chunk{
 
 		$x = $stream->getInt();
 		$z = $stream->getInt();
+		$flags = $stream->getByte();
+		$lightPopulated = (bool) ($flags & 4);
+		$terrainPopulated = (bool) ($flags & 2);
+		$terrainGenerated = (bool) ($flags & 1);
+
 		$subChunks = [];
-		$count = $stream->getByte();
-		for($y = 0; $y < $count; ++$y){
-			$subChunks[$stream->getByte()] = SubChunk::fastDeserialize($stream->get(10240));
+		$biomeIds = "";
+		$heightMap = [];
+		if($terrainGenerated){
+			$count = $stream->getByte();
+			for($y = 0; $y < $count; ++$y){
+				$subChunks[$stream->getByte()] = new SubChunk(
+					$stream->get(4096), //blockids
+					$stream->get(2048), //blockdata
+					$lightPopulated ? $stream->get(2048) : "", //skylight
+					$lightPopulated ? $stream->get(2048) : "" //blocklight
+				);
+			}
+
+			$biomeIds = $stream->get(256);
+			if($lightPopulated){
+				$heightMap = array_values(unpack("v*", $stream->get(512)));
+			}
 		}
-		$heightMap = array_values(unpack("v*", $stream->get(512)));
-		$biomeIds = $stream->get(256);
 
 		$chunk = new Chunk($x, $z, $subChunks, [], [], $biomeIds, $heightMap);
-		$flags = $stream->getByte();
-		$chunk->lightPopulated = (bool) ($flags & 4);
-		$chunk->terrainPopulated = (bool) ($flags & 2);
-		$chunk->terrainGenerated = (bool) ($flags & 1);
+		$chunk->setGenerated($terrainGenerated);
+		$chunk->setPopulated($terrainPopulated);
+		$chunk->setLightPopulated($lightPopulated);
+
 		return $chunk;
 	}
 }
diff --git a/src/pocketmine/level/format/EmptySubChunk.php b/src/pocketmine/level/format/EmptySubChunk.php
index 7d8c22544..1e137ae05 100644
--- a/src/pocketmine/level/format/EmptySubChunk.php
+++ b/src/pocketmine/level/format/EmptySubChunk.php
@@ -126,8 +126,4 @@ class EmptySubChunk implements SubChunkInterface{
 	public function networkSerialize() : string{
 		return "\x00" . str_repeat("\x00", 6144);
 	}
-
-	public function fastSerialize() : string{
-		throw new \BadMethodCallException("Should not try to serialize empty subchunks");
-	}
 }
diff --git a/src/pocketmine/level/format/SubChunk.php b/src/pocketmine/level/format/SubChunk.php
index 33ce57d6b..650a566c5 100644
--- a/src/pocketmine/level/format/SubChunk.php
+++ b/src/pocketmine/level/format/SubChunk.php
@@ -222,23 +222,6 @@ class SubChunk implements SubChunkInterface{
 		return "\x00" . $this->ids . $this->data;
 	}
 
-	public function fastSerialize() : string{
-		return
-			$this->ids .
-			$this->data .
-			$this->skyLight .
-			$this->blockLight;
-	}
-
-	public static function fastDeserialize(string $data) : SubChunk{
-		return new SubChunk(
-			substr($data,    0, 4096), //ids
-			substr($data, 4096, 2048), //data
-			substr($data, 6144, 2048), //sky light
-			substr($data, 8192, 2048)  //block light
-		);
-	}
-
 	public function __debugInfo(){
 		return [];
 	}
diff --git a/src/pocketmine/level/format/SubChunkInterface.php b/src/pocketmine/level/format/SubChunkInterface.php
index f777b67ec..e7d4cde8b 100644
--- a/src/pocketmine/level/format/SubChunkInterface.php
+++ b/src/pocketmine/level/format/SubChunkInterface.php
@@ -202,9 +202,4 @@ interface SubChunkInterface{
 	 * @return string
 	 */
 	public function networkSerialize() : string;
-
-	/**
-	 * @return string
-	 */
-	public function fastSerialize() : string;
 }