diff --git a/libraries/osu_cacher.php b/libraries/osu_cacher.php
index eca44a2..16d1236 100644
--- a/libraries/osu_cacher.php
+++ b/libraries/osu_cacher.php
@@ -8,6 +8,7 @@ class osu_cacher
 	{
 		$this->root = $root;
 		$this->cache_root = $cache_root;
+		if (!file_exists($cache_root)) mkdir($cache_root, 0777, true);
 	}
 	
 	public function get_root() : string
@@ -30,21 +31,29 @@ class osu_cacher
 		return file_exists($this->get_cached_path($path));
 	}
 	
-	public function get_cached(string $path, $hash=false)// : array|bool // see you again in php8
+	public function get_cache(string $path, $hash=false)// : array|bool // see you again in php8
 	{
-		if (!is_cached($path)) return false;
+		if (!$this->is_cached($path)) return false;
 		
 		$raw = file_get_contents($this->get_cached_path($path));
 		$json = json_decode($raw, true);
 		
-		if ($hash !== false && $hash != $json["hash"]) return false; // hash check failed
+		if (empty($json)) return false; // cache had empty save
+		
+		if ($hash !== false && $hash != ($json["hash"] ?? false)) return false; // hash check failed
 		
 		return $json;
 	}
 	
 	public function set_cache(string $path, array $content) : void
 	{
+		$cache_path = $this->get_cached_path($path);
+		$cache_dir = dirname($cache_path);
+		if (!file_exists($cache_dir)) mkdir($cache_dir, 0777, true);
+		
+		if (!isset($content["hash"])) $content["hash"] = hash_file("md5", $path);
+		
 		$encoded = json_encode($content);
-		file_put_contents($this->get_cached_path($path), $encoded);
+		file_put_contents($cache_path, $encoded);
 	}
 }
\ No newline at end of file
diff --git a/libraries/osu_library.php b/libraries/osu_library.php
index b77a894..e610ae1 100644
--- a/libraries/osu_library.php
+++ b/libraries/osu_library.php
@@ -6,6 +6,7 @@ class osu_library
 {
 	private static $song_library_folder = "Songs";
 	private static $db_file_location = "session/optimizer_data.json";
+	private static $cache_root = "session/cache";
 	
 	private $db;
 	
@@ -22,7 +23,11 @@ class osu_library
 		
 		$this->set_root($root); // update db entry
 		
-		foreach(glob($this->get_library_folder() . "/*", GLOB_ONLYDIR) as $folder)
+		$this->clear_library();
+		$glob = glob($this->get_library_folder() . "/*", GLOB_ONLYDIR);
+		
+		natsort($glob); // i like wasting your processing power
+		foreach($glob as $folder)
 		{
 			$this->scan_add_folder($folder);
 		}
@@ -30,11 +35,11 @@ class osu_library
 	
 	public function rescan_library(string $root) : void
 	{
-		$this->clear_library_cache();
+		$this->clear_library();
 		$this->scan_library($root);
 	}
 	
-	private function clear_library_cache() : void
+	private function clear_library() : void
 	{
 		unset($this->db["library"]);
 	}
@@ -50,9 +55,12 @@ 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)
 		{
-			$difficulty = osu_parser::parse_osu_file_format($file);
+			$difficulty = $parser->parse_osu_file_format($file);
 			$difficulty["key"] = basename($file);
 			$difficulty["path"] = $file;
 			
@@ -71,7 +79,9 @@ class osu_library
 		
 		// if (!isset($this->db["library"])) $this->db["library"] = array();
 		
-		$this->db["library"] = array(); // init or reset
+		// init empty
+		if (!isset($this->db["library"])) $this->db["library"] = array();
+		
 		$this->db["library"][$key] = $entry;
 	}
 	
diff --git a/libraries/osu_old_parser.php b/libraries/osu_old_parser.php
index b2d157b..c30834f 100644
--- a/libraries/osu_old_parser.php
+++ b/libraries/osu_old_parser.php
@@ -20,7 +20,7 @@ class osu_old_parser
 		foreach ($file as $key => $line)
 		{
 			
-			if (strpos($line, "[") === 0 && strpos($line, "]") === (strlen($line)-1))
+			if (mb_strpos($line, "[") === 0 && mb_strpos($line, "]") === (strlen($line)-1))
 			{
 				$current_section = str_replace([ "[", "]" ], "", $line);
 				if (!isset($osu[$current_section]))
@@ -73,15 +73,15 @@ class osu_old_parser
 			if ($skip) continue;
 			
 			
-			if (strpos($line, "//") === 0) // there were commented files that broke my script
+			if (mb_strpos($line, "//") === 0) // there were commented files that broke my script
 			{
 			}
 			else if ($section_type == "key-value pairs")
 			{
-				$delimiter_position = strpos($line, $delimiter);
+				$delimiter_position = mb_strpos($line, $delimiter);
 				
-				$value = substr($line, $delimiter_position + strlen($delimiter_position));
-				$osu[$current_section][substr($line, 0, $delimiter_position)] = $value;
+				$value = mb_substr($line, $delimiter_position + strlen($delimiter_position));
+				$osu[$current_section][mb_substr($line, 0, $delimiter_position)] = $value;
 			}
 			else if ($section_type == "lists")
 			{
@@ -90,7 +90,7 @@ class osu_old_parser
 				// group events by type and start time
 				if ($current_section == "Events")
 				{
-					if (strpos($line, " ") === 0) continue; // skip storyboard details lines
+					if (mb_strpos($line, " ") === 0) continue; // skip storyboard details lines
 					
 					// event types: https://github.com/ppy/osu/blob/master/osu.Game/Beatmaps/Legacy/LegacyEventType.cs
 					$list[0] = str_replace(
@@ -199,7 +199,7 @@ class osu_old_parser
 		$current_section = "UnofficialComments";
 		foreach ($file as $key => $line)
 		{
-			if (strpos($line, "[") === 0 && strpos($line, "]") === (strlen($line)-1))
+			if (mb_strpos($line, "[") === 0 && mb_strpos($line, "]") === (strlen($line)-1))
 			{
 				$current_section = str_replace([ "[", "]" ], "", $line);
 				continue;
diff --git a/libraries/osu_parser.php b/libraries/osu_parser.php
index 2213f6a..184f004 100644
--- a/libraries/osu_parser.php
+++ b/libraries/osu_parser.php
@@ -48,7 +48,7 @@ class osu_parser
 		$parsed = array();
 		
 		// file format declaration
-		if (stripos($file[0], "osu file format ") === false)
+		if (stripos($file[0], "osu file format ") !== false)
 		{
 			// the ranker script had a bug where random "ZERO WIDTH NO-BREAK SPACE"
 			// characters were at beginning of the .osu files
@@ -61,17 +61,19 @@ class osu_parser
 		}
 		
 		$current_section = false;
+		$section_type = false;
+		$delimiter = false;
 		$needed_sections = [ "General", "Metadata", "Difficulty", "Events" ];
 		foreach ($file as $key => $line)
 		{
-			if (strpos($line, "[") === 0 && strpos($line, "]") === (strlen($line)-1))
+			if (mb_strpos($line, "[") === 0 && mb_strpos($line, "]") === (strlen($line)-1))
 			{
 				list($current_section, $section_type, $delimiter) = self::parse_osu_file_section_header($line, $needed_sections);
 				
 				continue; // this line has been analyzed
 			}
 			
-			if (strpos($line, "//") === 0 || // the editor puts hella lot of comments in the files
+			if (mb_strpos($line, "//") === 0 || // the editor puts hella lot of comments in the files
 				$section_type === false)
 			{
 			}
@@ -80,20 +82,24 @@ class osu_parser
 				// init empty array
 				if (!isset($parsed[$current_section])) $parsed[$current_section] = array();
 				
-				$delimiter_position = strpos($line, $delimiter);
+				$delimiter_position = mb_strpos($line, $delimiter);
 				
-				$kv_key = substr($line, 0, $delimiter_position);
-				$kv_value = substr($line, $delimiter_position + strlen($delimiter_position));
-				
-				// after some thinking, keeping the original names was a good idea
-				$parsed[$current_section][$kv_key] = $kv_value;
+				// old maps had random lines and lines with different delimiters (why?)
+				if ($delimiter_position !== false)
+				{
+					$kv_key = mb_substr($line, 0, $delimiter_position);
+					$kv_value = mb_substr($line, $delimiter_position + strlen($delimiter));
+					
+					// after some thinking, keeping the original names was a good idea
+					$parsed[$current_section][$kv_key] = $kv_value;
+				}
 			}
 			else if ($section_type == "lists")
 			{
 				$list = explode($delimiter, $line);
 				if ($current_section == "Events") // saving the whole thing would take up too much space
 				{
-					if (strpos($line, " ") === 0 || strpos($line, "_") === 0) continue; // skip storyboard details lines
+					if (mb_strpos($line, " ") === 0 || mb_strpos($line, "_") === 0) continue; // skip storyboard details lines
 					
 					list($event_type, $source_files) = self::gather_source_files($list);
 					
@@ -136,6 +142,10 @@ class osu_parser
 		}
 		unset($file); // remove the memory leak
 		
+		$time_end = microtime(true);
+		$parsing_time = $time_end - $time_start;
+		$parsed["parsing_time"] = $parsing_time;
+		
 		if (!$skip_cache)
 		{
 			$this->cacher->set_cache($path, $parsed);
@@ -146,7 +156,7 @@ class osu_parser
 	
 	public static function gather_source_files(array $list) : array
 	{
-		$list[0] = convert_event_type($list[0]);
+		$list[0] = self::convert_event_type($list[0]);
 		$event_type = $list[0];
 		
 		if (!in_array($event_type, [ "0", "1", "4", "5", "6" ]))
diff --git a/main.php b/main.php
index 58036e0..b542732 100644
--- a/main.php
+++ b/main.php
@@ -2,6 +2,7 @@
 // todo: whitelist / blacklist
 // todo: repack osz file
 set_time_limit(300000);
+ini_set('memory_limit', '1024M');
 
 require_once "libraries/osu_library.php";
 require_once "libraries/optimizer.php";
@@ -67,10 +68,10 @@ foreach ($lib->get_library() as $set)
 {
 	foreach ($set["difficulties"] as $map)
 	{
-		$proc_time += $map["process_time"];
+		$proc_time += $map["parsing_time"] ?? 0;
 	}
 }
-echo "<h3>Process time: " . $proc_time . " seconds</h3>";
+echo "<h3>Parse time: " . $proc_time . " seconds</h3>";
 // foreach ($lib->get_library() as $mapset)
 // {
 	// echo '<div class="beatmapset">';
@@ -80,8 +81,8 @@ echo "<h3>Process time: " . $proc_time . " seconds</h3>";
 	// echo '</h2>';
 	// foreach ($mapset["difficulties"] as $beatmap)
 	// {
-		// $beatmap["format-2"] = substr($beatmap["format"] ?? "v1", 1);
-		// if (is_numeric(substr($beatmap["format"] ?? "v1", 1)))
+		// $beatmap["format-2"] = mb_substr($beatmap["format"] ?? "v1", 1);
+		// if (is_numeric(mb_substr($beatmap["format"] ?? "v1", 1)))
 		// {
 			// echo '<div class="beatmap">';
 			// echo '<h3>Title: ' . $beatmap["title"];
diff --git a/resources/start.html b/resources/start.html
index 267584f..cb608c9 100644
--- a/resources/start.html
+++ b/resources/start.html
@@ -2,5 +2,6 @@
 <head>
 	<title>osu! Optimizer by Thayol</title>
 	<style>{{ STYLE }}</style>
+	<meta charset="UTF-8">
 </head>
 <body id="body">
\ No newline at end of file