If you are not using your PC/laptop as a server, then 99,99% you dont need network at the boot time.
Disabling NetworkManager can speed up your machine.
> sudo systemctl disable NetworkManager
Of course we all need network, so tell your machine to start NetworkManager after your boot process. And you can do that by editing your crontab as root:
> sudo -s # crontab -e
@reboot systemctl start NetworkManager
try this and measure the time you have saved by
before and after .