Sometimes a systemd service has a big value for the variable "TimeoutStartSec" for example systemd's networking service. If systemd has a problem to raise up the network interfaces then the boot of a Linux system needs more time because systemd try to configure the network interfaces again till the TimeoutStartSec has reached the value. I set the variable "TimeoutStartSec" to 2 seconds and after a reboot the delay of initialisation of the network devices are gone.
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nano /etc/systemd/system/network-online.target.wants/networking.service
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TimeoutStartSec=2
Christian