diff --git a/src/utils/routes/cours.rs b/src/utils/routes/cours.rs
index 3259bbd..33ce89e 100644
--- a/src/utils/routes/cours.rs
+++ b/src/utils/routes/cours.rs
@@ -1,5 +1,6 @@
 use std::{cmp::Ordering, path::Path};
 
+use cached::proc_macro::once;
 use regex::Regex;
 use serde::Serialize;
 
@@ -29,10 +30,19 @@ impl PartialOrd for FileNode {
     }
 }
 
+#[once(time = 120)]
 pub fn get_filetree(
     dir_path: &str,
     exclusion_list: &[String],
     exclusion_patterns: &[Regex],
+) -> FileNode {
+    gen_filetree(dir_path, exclusion_list, exclusion_patterns)
+}
+
+fn gen_filetree(
+    dir_path: &str,
+    exclusion_list: &[String],
+    exclusion_patterns: &[Regex],
 ) -> FileNode {
     let mut children: Vec<FileNode> = std::fs::read_dir(dir_path)
         .unwrap()
@@ -54,7 +64,7 @@ pub fn get_filetree(
                 })
             } else {
                 // Exclude empty directories
-                let children_of_children = get_filetree(
+                let children_of_children = gen_filetree(
                     entry_path.to_str().unwrap(),
                     exclusion_list,
                     exclusion_patterns,