diff --git a/confs/ovh3/systemd/system/sync_images_s3@.service b/confs/ovh3/systemd/system/sync_images_s3@.service
index 9044f872..22bed9ee 100644
--- a/confs/ovh3/systemd/system/sync_images_s3@.service
+++ b/confs/ovh3/systemd/system/sync_images_s3@.service
@@ -8,6 +8,8 @@ OnFailure=email-failures@sync_images_s3__%i.service
 Type=oneshot
 User=off
 Group=off
+IOSchedulingClass=best-effort
+IOSchedulingPriority=7
 # Warning: this script doesn't work currently with non-off product type
 ExecStart=/home/off/.cargo/bin/uv run /opt/openfoodfacts-infrastructure/scripts/ovh3/sync-s3-images/sync_s3_images.py /rpool/off/images/products
 KillMode=process