diff --git a/libraries/optimizer.php b/libraries/optimizer.php
index dbea1aa..77a13e2 100644
--- a/libraries/optimizer.php
+++ b/libraries/optimizer.php
@@ -1,4 +1,5 @@
 <?php
+// todo: make it work correctly on mac & linux (case sensitivity on deletion)
 class optimizer
 {
 	public static function is_default_hitsound(string $path) : bool
@@ -106,47 +107,40 @@ class optimizer
 	{
 		$queue = array();
 		
-		$times_c = array();
-		$time_1 = microtime(true);
 		foreach ($library->get_folders() as $folder)
 		{
-			$time_start = microtime(true);
 			self::build_removand_sublist($queue, $folder, $single_level);
-			$time_end = microtime(true);
-			$times_c[$folder] = $time_end - $time_start;
 		}
-		$time_2 = microtime(true);
-		
-		arsort($times_c);
-		$times_c = array_splice($times_c, 0, 100);
-		
-		$time_3 = $time_2-$time_1;
-		echo "{$time_3}<br />";
-		echo "<pre>";
-		print_r($times_c);
-		echo "</pre>";
 		
 		return $queue;
 	}
 	
-	public static function build_excluded_list(osu_library $library) : array
+	public static function build_excluded_list(osu_library $library, bool $nuke = false) : array
 	{
 		$background_files = $library->get_backgrounds();
 		$video_files = $library->get_videos();
 		$audio_files = $library->get_audiofiles();
 		
-		$storyboard_files = $library->get_storyboards();
-		$hitsound_files = $library->get_hitsounds();
-		
-		// $osu_files = $library->get_osu_files();
-		// $osb_files = $library->get_osb_files();
-		$physical_excluded = $library->get_parsed_files();
-		
 		$essential_excluded = array_merge($background_files, $video_files, $audio_files);
-		// $physical_excluded = array_merge($osb_files, $osu_files);
-		$other_excluded = array_merge($storyboard_files, $hitsound_files);
 		
-		$excluded = array_merge($essential_excluded, $physical_excluded, $other_excluded);
+		if (!$nuke)
+		{
+			$storyboard_files = $library->get_storyboards();
+			$hitsound_files = $library->get_hitsounds();
+			
+			// $osu_files = $library->get_osu_files();
+			// $osb_files = $library->get_osb_files();
+			$physical_excluded = $library->get_parsed_files();
+			
+			// $physical_excluded = array_merge($osb_files, $osu_files);
+			$other_excluded = array_merge($storyboard_files, $hitsound_files);
+			
+			$excluded = array_merge($essential_excluded, $physical_excluded, $other_excluded);
+		}
+		else
+		{
+			$excluded = $essential_excluded;
+		}
 		
 		return $excluded;
 	}
@@ -192,16 +186,14 @@ class optimizer
 		{
 			if (self::is_skinnable_image($file) || self::is_skinnable_other($file))
 			{
-				// if (file_exists($file)) unlink($file);
-				echo $file . "<br />";
+				if (file_exists($file)) unlink($file);
 			}
 		}
-		exit(0); // testing purposes
 	}
 	
 	public static function remove_hitsounds(osu_library $library) : void
 	{
-		$removand = self::build_single_level_removand_list($library, true);
+		$removand = self::build_removand_list($library, true);
 		$exclusions = self::build_excluded_list($library);
 		
 		$junk_files = self::array_diff_ver_peppy($removand, $exclusions);
@@ -215,19 +207,22 @@ class optimizer
 		}
 	}
 	
-	public static function remove_other(osu_library $library) : void
+	public static function full_nuke(osu_library $library) : void
+	{
+		self::remove_other($library, true);
+	}
+	
+	public static function remove_other(osu_library $library, bool $nuke = false) : void
 	{
 		$removand = self::build_removand_list($library);
-		$exclusions = self::build_excluded_list($library);
+		$exclusions = self::build_excluded_list($library, $nuke);
 		
 		$junk_files = self::array_diff_ver_peppy($removand, $exclusions);
 		
 		foreach ($junk_files as $file)
 		{
 			if (self::is_skinnable($file)) continue; // ignore default hitsounds
-			// if (file_exists($file)) unlink($file);
-			echo $file . "<br />";
+			if (file_exists($file)) unlink($file);
 		}
-		exit(0); // testing purposes
 	}
 }
\ No newline at end of file
diff --git a/libraries/osu_cacher.php b/libraries/osu_cacher.php
index 16d1236..365adda 100644
--- a/libraries/osu_cacher.php
+++ b/libraries/osu_cacher.php
@@ -1,6 +1,9 @@
 <?php
 class osu_cacher
 {
+	public static $hash_function = "md5";
+	// public static $hash_function = "crc32";
+	
 	private $root;
 	private $cache_root;
 	
@@ -34,7 +37,7 @@ class osu_cacher
 	public function get_cache(string $path, $hash=false)// : array|bool // see you again in php8
 	{
 		if (!$this->is_cached($path)) return false;
-		
+
 		$raw = file_get_contents($this->get_cached_path($path));
 		$json = json_decode($raw, true);
 		
@@ -51,7 +54,7 @@ class osu_cacher
 		$cache_dir = dirname($cache_path);
 		if (!file_exists($cache_dir)) mkdir($cache_dir, 0777, true);
 		
-		if (!isset($content["hash"])) $content["hash"] = hash_file("md5", $path);
+		if (!isset($content["hash"])) $content["hash"] = hash_file(self::$hash_function, $path);
 		
 		$encoded = json_encode($content);
 		file_put_contents($cache_path, $encoded);
diff --git a/libraries/osu_library.php b/libraries/osu_library.php
index 688ef3a..fe8973d 100644
--- a/libraries/osu_library.php
+++ b/libraries/osu_library.php
@@ -118,13 +118,16 @@ class osu_library
 		$osb_glob = glob(utils::globsafe($folder) . "/*.osb");
 		$glob = array_merge($osu_glob, $osb_glob);
 		
+		
 		$cacher = new osu_cacher($this->get_library_folder(), self::$cache_root);
 		$parser = new osu_parser($cacher);
 		
 		foreach ($glob as $file)
 		{
 			$difficulty_key = basename($file);
+		
 			$difficulty = $parser->parse_osu_file_format($file);
+			
 			$difficulty["key"] = $difficulty_key;
 			$difficulty["path"] = $file;
 				
diff --git a/libraries/osu_parser.php b/libraries/osu_parser.php
index 4543e0f..5e56dc7 100644
--- a/libraries/osu_parser.php
+++ b/libraries/osu_parser.php
@@ -60,7 +60,9 @@ class osu_parser
 		
 		if (!$skip_cache)
 		{
-			$cached = $this->cacher->get_cache($path, hash_file("md5", $path));
+			$hash = hash_file(osu_cacher::$hash_function, $path);
+			
+			$cached = $this->cacher->get_cache($path, $hash);
 			if ($cached !== false) return $cached;
 		}
 		
@@ -215,6 +217,7 @@ class osu_parser
 		$time_end = microtime(true);
 		$parsing_time = $time_end - $time_start;
 		$parsed["parsing_time"] = $parsing_time;
+		if (!empty($hash)) $parsed["hash"] = $hash;
 		
 		if (!$skip_cache)
 		{