diff --git a/playbooks/templates/replayer@.service b/playbooks/templates/replayer@.service
index bc3af20..f73827f 100644
--- a/playbooks/templates/replayer@.service
+++ b/playbooks/templates/replayer@.service
@@ -1,14 +1,16 @@
 [Unit]
 Description=Kafka to Cassandra replayer
 After=network.target
 Requires=swh-storage-cassandra@%i.service
 
 [Service]
 Type=simple
 ExecStart=/bin/bash -c 'sleep $(( RANDOM % 60 )); exec /home/{{ansible_user}}/.local/bin/swh journal --config-file /home/{{ansible_user}}/replayer_%i.yml replay --broker esnode1.internal.softwareheritage.org --group-id vlorentz-cassandra-test-0'
 Restart=on-failure
 Environment=PYTHONUNBUFFERED=1
 SyslogIdentifier=replayer-%i
 
+Nice=10
+
 [Install]
 WantedBy=default.target