diff --git a/shell/oauth2_latency b/shell/oauth2_latency
new file mode 100755
index 0000000..0d18ef6
--- /dev/null
+++ b/shell/oauth2_latency
@@ -0,0 +1,15 @@
+#!/usr/bin/sh
+# Copyright (C) 2018-2025 by BDE ENS-Paris-Saclay
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# use this script for reduce latency with oauth2_provider (cf. https://gitlab.crans.org/bde/nk20/issues/134)
+
+# Tested with django-oauth2-toolkit version 3.0.1
+
+sed -i -e "s/get_all_scopes()/get_all_scopes(scopes=scopes)/g" /var/www/note_kfet/env/lib/python3.11/site-packages/oauth2_provider/views/base.py
+
+sed -i -e '/get_all_scopes()/{N;s/\(.*\)\n\(.*\)/\2\n\1/;s/get_all_scopes()/get_all_scopes(scopes=token_scopes)/}' /var/www/note_kfet/env/lib/python3.11/site-packages/oauth2_provider/models.py
+
+sed -i -e '/get_all_scopes()/{N;s/\(.*\)\n\(.*\)/\2\n\1/;s/get_all_scopes()/get_all_scopes(scopes=read_write_scopes)/}' /var/www/note_kfet/env/lib/python3.11/site-packages/oauth2_provider/views/mixins.py
+
+sed -i -e '/get_all_scopes()/{N;s/\(.*\)\n\(.*\)/\2\n\1/;s/get_all_scopes()/get_all_scopes(scopes=read_write_scopes)/}' /var/www/note_kfet/env/lib/python3.11/site-packages/oauth2_provider/decorators.py