# Show hidden startup apps.
sudo sed -i "s/NoDisplay=true/NoDisplay=false/g" /etc/xdg/autostart/*.desktop

# Analyze startup times.
systemd-analyze
systemd-analyze blame

# Reduce wrong password delay to 0.5 s.
sudo vim /etc/pam.d/login
auth       optional   pam_faildelay.so  delay=500000