diff --git a/systemd/tray-apps/protonmail-bridge.service b/systemd/tray-apps/protonmail-bridge.service
index f1f8809..34bfc54 100644
--- a/systemd/tray-apps/protonmail-bridge.service
+++ b/systemd/tray-apps/protonmail-bridge.service
@@ -5,6 +5,8 @@ PartOf=tray-apps.target
 After=tray-apps.target
 
 [Service]
+# Prevent lag when syncing
+Nice=15
 ExecStart=/usr/bin/protonmail-bridge --no-window
 
 [Install]