diff --git a/src/pocketmine/world/format/Chunk.php b/src/pocketmine/world/format/Chunk.php
index d7af0f314..7fccb58ed 100644
--- a/src/pocketmine/world/format/Chunk.php
+++ b/src/pocketmine/world/format/Chunk.php
@@ -37,12 +37,10 @@ use pocketmine\nbt\tag\CompoundTag;
 use pocketmine\network\mcpe\NetworkBinaryStream;
 use pocketmine\network\mcpe\protocol\types\RuntimeBlockMapping;
 use pocketmine\Player;
-use pocketmine\utils\BinaryStream;
 use pocketmine\world\World;
 use function array_fill;
 use function array_filter;
 use function array_map;
-use function array_values;
 use function assert;
 use function chr;
 use function count;
@@ -50,7 +48,6 @@ use function ord;
 use function pack;
 use function str_repeat;
 use function strlen;
-use function unpack;
 
 class Chunk{
 
@@ -766,116 +763,6 @@ class Chunk{
 		return $stream->getBuffer();
 	}
 
-	/**
-	 * Fast-serializes the chunk for passing between threads
-	 * TODO: tiles and entities
-	 *
-	 * @return string
-	 */
-	public function fastSerialize() : string{
-		$stream = new BinaryStream();
-		$stream->putInt($this->x);
-		$stream->putInt($this->z);
-		$stream->putByte(($this->lightPopulated ? 4 : 0) | ($this->terrainPopulated ? 2 : 0) | ($this->terrainGenerated ? 1 : 0));
-		if($this->terrainGenerated){
-			//subchunks
-			$count = 0;
-			$subStream = new BinaryStream();
-			foreach($this->subChunks as $y => $subChunk){
-				if($subChunk instanceof EmptySubChunk){
-					continue;
-				}
-				++$count;
-
-				$subStream->putByte($y);
-				$layers = $subChunk->getBlockLayers();
-				$subStream->putByte(count($subChunk->getBlockLayers()));
-				foreach($layers as $blocks){
-					$wordArray = $blocks->getWordArray();
-					$palette = $blocks->getPalette();
-
-					$subStream->putByte($blocks->getBitsPerBlock());
-					$subStream->put($wordArray);
-					$subStream->putInt(count($palette));
-					foreach($palette as $p){
-						$subStream->putInt($p);
-					}
-				}
-
-				if($this->lightPopulated){
-					$subStream->put($subChunk->getBlockSkyLightArray());
-					$subStream->put($subChunk->getBlockLightArray());
-				}
-			}
-			$stream->putByte($count);
-			$stream->put($subStream->getBuffer());
-
-			//biomes
-			$stream->put($this->biomeIds);
-			if($this->lightPopulated){
-				$stream->put(pack("v*", ...$this->heightMap));
-			}
-		}
-
-		return $stream->getBuffer();
-	}
-
-	/**
-	 * Deserializes a fast-serialized chunk
-	 *
-	 * @param string $data
-	 *
-	 * @return Chunk
-	 */
-	public static function fastDeserialize(string $data) : Chunk{
-		$stream = new BinaryStream($data);
-
-		$x = $stream->getInt();
-		$z = $stream->getInt();
-		$flags = $stream->getByte();
-		$lightPopulated = (bool) ($flags & 4);
-		$terrainPopulated = (bool) ($flags & 2);
-		$terrainGenerated = (bool) ($flags & 1);
-
-		$subChunks = [];
-		$biomeIds = "";
-		$heightMap = [];
-		if($terrainGenerated){
-			$count = $stream->getByte();
-			for($subCount = 0; $subCount < $count; ++$subCount){
-				$y = $stream->getByte();
-
-				/** @var PalettedBlockArray[] $layers */
-				$layers = [];
-				for($i = 0, $layerCount = $stream->getByte(); $i < $layerCount; ++$i){
-					$bitsPerBlock = $stream->getByte();
-					$words = $stream->get(PalettedBlockArray::getExpectedWordArraySize($bitsPerBlock));
-					$palette = [];
-					for($k = 0, $paletteSize = $stream->getInt(); $k < $paletteSize; ++$k){
-						$palette[] = $stream->getInt();
-					}
-
-					$layers[] = PalettedBlockArray::fromData($bitsPerBlock, $words, $palette);
-				}
-				$subChunks[$y] = new SubChunk(
-					$layers, $lightPopulated ? $stream->get(2048) : "", $lightPopulated ? $stream->get(2048) : "" //blocklight
-				);
-			}
-
-			$biomeIds = $stream->get(256);
-			if($lightPopulated){
-				$heightMap = array_values(unpack("v*", $stream->get(512)));
-			}
-		}
-
-		$chunk = new Chunk($x, $z, $subChunks, null, null, $biomeIds, $heightMap);
-		$chunk->setGenerated($terrainGenerated);
-		$chunk->setPopulated($terrainPopulated);
-		$chunk->setLightPopulated($lightPopulated);
-
-		return $chunk;
-	}
-
 	/**
 	 * Hashes the given chunk block coordinates into a single integer.
 	 *
diff --git a/src/pocketmine/world/format/io/FastChunkSerializer.php b/src/pocketmine/world/format/io/FastChunkSerializer.php
new file mode 100644
index 000000000..b86b05446
--- /dev/null
+++ b/src/pocketmine/world/format/io/FastChunkSerializer.php
@@ -0,0 +1,157 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\world\format\io;
+
+use pocketmine\utils\BinaryStream;
+use pocketmine\world\format\Chunk;
+use pocketmine\world\format\EmptySubChunk;
+use pocketmine\world\format\PalettedBlockArray;
+use pocketmine\world\format\SubChunk;
+use function array_values;
+use function count;
+use function pack;
+use function unpack;
+
+/**
+ * This class provides a serializer used for transmitting chunks between chunks.
+ * The serialization format **is not intended for permanent storage** and may change without warning.
+ */
+final class FastChunkSerializer{
+
+	private function __construct(){
+		//NOOP
+	}
+
+	/**
+	 * Fast-serializes the chunk for passing between threads
+	 * TODO: tiles and entities
+	 *
+	 * @param Chunk $chunk
+	 *
+	 * @return string
+	 */
+	public static function serialize(Chunk $chunk) : string{
+		$stream = new BinaryStream();
+		$stream->putInt($chunk->getX());
+		$stream->putInt($chunk->getZ());
+		$stream->putByte(($chunk->isLightPopulated() ? 4 : 0) | ($chunk->isPopulated() ? 2 : 0) | ($chunk->isGenerated() ? 1 : 0));
+		if($chunk->isGenerated()){
+			//subchunks
+			$count = 0;
+			$subStream = new BinaryStream();
+			foreach($chunk->getSubChunks() as $y => $subChunk){
+				if($subChunk instanceof EmptySubChunk){
+					continue;
+				}
+				++$count;
+
+				$subStream->putByte($y);
+				$layers = $subChunk->getBlockLayers();
+				$subStream->putByte(count($subChunk->getBlockLayers()));
+				foreach($layers as $blocks){
+					$wordArray = $blocks->getWordArray();
+					$palette = $blocks->getPalette();
+
+					$subStream->putByte($blocks->getBitsPerBlock());
+					$subStream->put($wordArray);
+					$subStream->putInt(count($palette));
+					foreach($palette as $p){
+						$subStream->putInt($p);
+					}
+				}
+
+				if($chunk->isLightPopulated()){
+					$subStream->put($subChunk->getBlockSkyLightArray());
+					$subStream->put($subChunk->getBlockLightArray());
+				}
+			}
+			$stream->putByte($count);
+			$stream->put($subStream->getBuffer());
+
+			//biomes
+			$stream->put($chunk->getBiomeIdArray());
+			if($chunk->isLightPopulated()){
+				$stream->put(pack("v*", ...$chunk->getHeightMapArray()));
+			}
+		}
+
+		return $stream->getBuffer();
+	}
+
+	/**
+	 * Deserializes a fast-serialized chunk
+	 *
+	 * @param string $data
+	 *
+	 * @return Chunk
+	 */
+	public static function deserialize(string $data) : Chunk{
+		$stream = new BinaryStream($data);
+
+		$x = $stream->getInt();
+		$z = $stream->getInt();
+		$flags = $stream->getByte();
+		$lightPopulated = (bool) ($flags & 4);
+		$terrainPopulated = (bool) ($flags & 2);
+		$terrainGenerated = (bool) ($flags & 1);
+
+		$subChunks = [];
+		$biomeIds = "";
+		$heightMap = [];
+		if($terrainGenerated){
+			$count = $stream->getByte();
+			for($subCount = 0; $subCount < $count; ++$subCount){
+				$y = $stream->getByte();
+
+				/** @var PalettedBlockArray[] $layers */
+				$layers = [];
+				for($i = 0, $layerCount = $stream->getByte(); $i < $layerCount; ++$i){
+					$bitsPerBlock = $stream->getByte();
+					$words = $stream->get(PalettedBlockArray::getExpectedWordArraySize($bitsPerBlock));
+					$palette = [];
+					for($k = 0, $paletteSize = $stream->getInt(); $k < $paletteSize; ++$k){
+						$palette[] = $stream->getInt();
+					}
+
+					$layers[] = PalettedBlockArray::fromData($bitsPerBlock, $words, $palette);
+				}
+				$subChunks[$y] = new SubChunk(
+					$layers, $lightPopulated ? $stream->get(2048) : "", $lightPopulated ? $stream->get(2048) : "" //blocklight
+				);
+			}
+
+			$biomeIds = $stream->get(256);
+			if($lightPopulated){
+				$heightMap = array_values(unpack("v*", $stream->get(512)));
+			}
+		}
+
+		$chunk = new Chunk($x, $z, $subChunks, null, null, $biomeIds, $heightMap);
+		$chunk->setGenerated($terrainGenerated);
+		$chunk->setPopulated($terrainPopulated);
+		$chunk->setLightPopulated($lightPopulated);
+
+		return $chunk;
+	}
+}
diff --git a/src/pocketmine/world/generator/PopulationTask.php b/src/pocketmine/world/generator/PopulationTask.php
index f599dce8e..76b715e84 100644
--- a/src/pocketmine/world/generator/PopulationTask.php
+++ b/src/pocketmine/world/generator/PopulationTask.php
@@ -25,6 +25,7 @@ namespace pocketmine\world\generator;
 
 use pocketmine\scheduler\AsyncTask;
 use pocketmine\world\format\Chunk;
+use pocketmine\world\format\io\FastChunkSerializer;
 use pocketmine\world\SimpleChunkManager;
 use pocketmine\world\World;
 
@@ -48,10 +49,10 @@ class PopulationTask extends AsyncTask{
 	public function __construct(World $world, Chunk $chunk){
 		$this->state = true;
 		$this->worldId = $world->getId();
-		$this->chunk = $chunk->fastSerialize();
+		$this->chunk = FastChunkSerializer::serialize($chunk);
 
 		foreach($world->getAdjacentChunks($chunk->getX(), $chunk->getZ()) as $i => $c){
-			$this->{"chunk$i"} = $c !== null ? $c->fastSerialize() : null;
+			$this->{"chunk$i"} = $c !== null ? FastChunkSerializer::serialize($c) : null;
 		}
 
 		$this->storeLocal(self::TLS_KEY_WORLD, $world);
@@ -70,7 +71,7 @@ class PopulationTask extends AsyncTask{
 		/** @var Chunk[] $chunks */
 		$chunks = [];
 
-		$chunk = Chunk::fastDeserialize($this->chunk);
+		$chunk = FastChunkSerializer::deserialize($this->chunk);
 
 		for($i = 0; $i < 9; ++$i){
 			if($i === 4){
@@ -82,7 +83,7 @@ class PopulationTask extends AsyncTask{
 			if($ck === null){
 				$chunks[$i] = new Chunk($chunk->getX() + $xx, $chunk->getZ() + $zz);
 			}else{
-				$chunks[$i] = Chunk::fastDeserialize($ck);
+				$chunks[$i] = FastChunkSerializer::deserialize($ck);
 			}
 		}
 
@@ -110,7 +111,7 @@ class PopulationTask extends AsyncTask{
 		$chunk->populateSkyLight();
 		$chunk->setLightPopulated();
 		$chunk->setPopulated();
-		$this->chunk = $chunk->fastSerialize();
+		$this->chunk = FastChunkSerializer::serialize($chunk);
 
 		$manager->setChunk($chunk->getX(), $chunk->getZ(), null);
 
@@ -133,7 +134,7 @@ class PopulationTask extends AsyncTask{
 				continue;
 			}
 
-			$this->{"chunk$i"} = $chunks[$i] !== null ? $chunks[$i]->fastSerialize() : null;
+			$this->{"chunk$i"} = $chunks[$i] !== null ? FastChunkSerializer::serialize($chunks[$i]) : null;
 		}
 	}
 
@@ -145,7 +146,7 @@ class PopulationTask extends AsyncTask{
 				$world->registerGeneratorToWorker($this->worker->getAsyncWorkerId());
 			}
 
-			$chunk = Chunk::fastDeserialize($this->chunk);
+			$chunk = FastChunkSerializer::deserialize($this->chunk);
 
 			for($i = 0; $i < 9; ++$i){
 				if($i === 4){
@@ -153,7 +154,7 @@ class PopulationTask extends AsyncTask{
 				}
 				$c = $this->{"chunk$i"};
 				if($c !== null){
-					$c = Chunk::fastDeserialize($c);
+					$c = FastChunkSerializer::deserialize($c);
 					$world->generateChunkCallback($c->getX(), $c->getZ(), $this->state ? $c : null);
 				}
 			}
diff --git a/src/pocketmine/world/light/LightPopulationTask.php b/src/pocketmine/world/light/LightPopulationTask.php
index 1c1e7c7e8..2583f138d 100644
--- a/src/pocketmine/world/light/LightPopulationTask.php
+++ b/src/pocketmine/world/light/LightPopulationTask.php
@@ -26,6 +26,7 @@ namespace pocketmine\world\light;
 use pocketmine\block\BlockFactory;
 use pocketmine\scheduler\AsyncTask;
 use pocketmine\world\format\Chunk;
+use pocketmine\world\format\io\FastChunkSerializer;
 use pocketmine\world\World;
 
 class LightPopulationTask extends AsyncTask{
@@ -35,7 +36,7 @@ class LightPopulationTask extends AsyncTask{
 
 	public function __construct(World $world, Chunk $chunk){
 		$this->storeLocal(self::TLS_KEY_WORLD, $world);
-		$this->chunk = $chunk->fastSerialize();
+		$this->chunk = FastChunkSerializer::serialize($chunk);
 	}
 
 	public function onRun() : void{
@@ -43,13 +44,13 @@ class LightPopulationTask extends AsyncTask{
 			BlockFactory::init();
 		}
 		/** @var Chunk $chunk */
-		$chunk = Chunk::fastDeserialize($this->chunk);
+		$chunk = FastChunkSerializer::deserialize($this->chunk);
 
 		$chunk->recalculateHeightMap();
 		$chunk->populateSkyLight();
 		$chunk->setLightPopulated();
 
-		$this->chunk = $chunk->fastSerialize();
+		$this->chunk = FastChunkSerializer::serialize($chunk);
 	}
 
 	public function onCompletion() : void{
@@ -57,7 +58,7 @@ class LightPopulationTask extends AsyncTask{
 		$world = $this->fetchLocal(self::TLS_KEY_WORLD);
 		if(!$world->isClosed()){
 			/** @var Chunk $chunk */
-			$chunk = Chunk::fastDeserialize($this->chunk);
+			$chunk = FastChunkSerializer::deserialize($this->chunk);
 			$world->generateChunkCallback($chunk->getX(), $chunk->getZ(), $chunk);
 		}
 	}