systemd
systemd is an amalgamation of service managers. It is configured by a number of service manager-specific configuration files in /etc/systemd. Most people are familiar with service-specific files (called unit files), which are located in sub-directories of this directory.
systemd
If a unit file takes too long to start at boot, systemd switches to verbose mode and prints information that may help in diagnosing issues. This setting can be explicitly disabled in /etc/systemd/system.conf.
[Manager] ShowStatus=no