Fedora 25 - Change grub timeout

Recently I wanted to speed up system boot by decreasing GRUB timeout. I’ve changed it from 5 to 0 seconds so at the moment GRUB doesn’t take 5 seconds before the system boots. It’s a very simple operation:

1. Edit GRUB configuration file - /etc/default/grub
2. Change GRUB_TIMEOUT value from 5 to 0
3. Rebuild GRUB.

sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

Done.