diff --git a/src/pocketmine/level/format/io/region/RegionLoader.php b/src/pocketmine/level/format/io/region/RegionLoader.php
index 15b868bf1..082476a93 100644
--- a/src/pocketmine/level/format/io/region/RegionLoader.php
+++ b/src/pocketmine/level/format/io/region/RegionLoader.php
@@ -198,81 +198,6 @@ class RegionLoader{
 		}
 	}
 
-	public function doSlowCleanUp() : int{
-		for($i = 0; $i < 1024; ++$i){
-			if($this->locationTable[$i][0] === 0 or $this->locationTable[$i][1] === 0){
-				continue;
-			}
-			fseek($this->filePointer, $this->locationTable[$i][0] << 12);
-			$chunk = fread($this->filePointer, $this->locationTable[$i][1] << 12);
-			$length = Binary::readInt(substr($chunk, 0, 4));
-			if($length <= 1){
-				$this->locationTable[$i] = [0, 0, 0]; //Non-generated chunk, remove it from index
-			}
-
-			try{
-				$chunk = zlib_decode(substr($chunk, 5));
-			}catch(\Throwable $e){
-				$this->locationTable[$i] = [0, 0, 0]; //Corrupted chunk, remove it
-				continue;
-			}
-
-			$chunk = chr(self::COMPRESSION_ZLIB) . zlib_encode($chunk, ZLIB_ENCODING_DEFLATE, 9);
-			$chunk = Binary::writeInt(strlen($chunk)) . $chunk;
-			$sectors = (int) ceil(strlen($chunk) / 4096);
-			if($sectors > $this->locationTable[$i][1]){
-				$this->locationTable[$i][0] = $this->lastSector + 1;
-				$this->lastSector += $sectors;
-			}
-			fseek($this->filePointer, $this->locationTable[$i][0] << 12);
-			fwrite($this->filePointer, str_pad($chunk, $sectors << 12, "\x00", STR_PAD_RIGHT));
-		}
-		$this->writeLocationTable();
-		$n = $this->cleanGarbage();
-		$this->writeLocationTable();
-
-		return $n;
-	}
-
-	private function cleanGarbage() : int{
-		$sectors = [];
-		foreach($this->locationTable as $index => $data){ //Calculate file usage
-			if($data[0] === 0 or $data[1] === 0){
-				$this->locationTable[$index] = [0, 0, 0];
-				continue;
-			}
-			for($i = 0; $i < $data[1]; ++$i){
-				$sectors[$data[0]] = $index;
-			}
-		}
-
-		if(count($sectors) === ($this->lastSector - 2)){ //No collection needed
-			return 0;
-		}
-
-		ksort($sectors);
-		$shift = 0;
-		$lastSector = 1; //First chunk - 1
-
-		fseek($this->filePointer, 8192);
-		$sector = 2;
-		foreach($sectors as $sector => $index){
-			if(($sector - $lastSector) > 1){
-				$shift += $sector - $lastSector - 1;
-			}
-			if($shift > 0){
-				fseek($this->filePointer, $sector << 12);
-				$old = fread($this->filePointer, 4096);
-				fseek($this->filePointer, ($sector - $shift) << 12);
-				fwrite($this->filePointer, $old, 4096);
-			}
-			$this->locationTable[$index][0] -= $shift;
-			$lastSector = $sector;
-		}
-		ftruncate($this->filePointer, ($sector + 1) << 12); //Truncate to the end of file written
-		return $shift;
-	}
-
 	protected function loadLocationTable(){
 		fseek($this->filePointer, 0);
 		$this->lastSector = 1;