Comment 103 for bug 1594023

Every machine is different. Here's the grub that I use on 'doorstop' machines:

# If you change this file, run 'update-grub' afterwards to update
GRUB_DEFAULT="0"
GRUB_TIMEOUT_STYLE="true"
GRUB_TIMEOUT="10"
GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null || echo Debian`"
GRUB_CMDLINE_LINUX_DEFAULT="elevator=deadline quiet splash plymouth.enable=0 libahci.ignore_sss=1 noefi"
GRUB_CMDLINE_LINUX="libata.force=noncq"
GRUB_GFXMODE="1920x1200x24

It knocks a few seconds off of boot times, and shuts them down in a heartbeat.

Here's the 'systemd-analyze time' result on my Dell Dimension 3000 box, circa 2004:

Startup finished in 3.650s (kernel) + 7.044s (userspace) = 10.694s
graphical.target reached after 7.008s in userspace

No joke...