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Plymouth is an application that runs very early in the boot process (even before the root filesystem is mounted!) that provides a graphical boot animation while the boot process happens in the background.

you can install plymouth on slackware from plymouth for which i use sbotools which is at sbotools

once plymouth is installed

edit /etc/dracut.conf.d/myflags.conf and add this line

add_dracutmodules+=" plymouth "

edit your /etc/default/grub to include

GRUB_CMDLINE_LINUX_DEFAULT="splash"

themes are in /usr/share/plymouth/themes

to view available themes

plymouth-set-default-theme -l

to set the theme

plymouth-set-default-theme solar

dracut --list-modules

load plymouth module

dracut --add-drivers plymouth

build new initrd

dracut --force /boot/initrd-<kernel-version>.img

update your bootloader to use the new initrd. i use grub2

grub-mkconfig -o /boot/grub/grub.cfg