diff --git a/php/get.php b/php/get.php
index 4b573d3..e322614 100644
--- a/php/get.php
+++ b/php/get.php
@@ -65,7 +65,8 @@ function create_thumbnail(string $category, string $file): string | null {
 
 	$path = add_seperator_ab("/", $category, $file);
 	$original_file = ROOT_DIR.IMG_DIR.$path;
-	$hash = hash_file("sha1", $original_file);
+	# use fast hashing algo, see: https://github.com/Cyan4973/xxHash
+	$hash = hash_file("xxh3", $original_file);
 
 	$thumbnail_directory = ROOT_DIR.THUMBNAIL_DIR;
 	$thumbnail_name = "$hash.jpg";