GRUB is a "bootloader" responsible for instructing your computer to run Linux (or BSD, Windows, or whatever) when it turns on. Whilst possibly asking which installed OS you want to run & how.
Since it starts up without an OS running, it needs to implement enough of one itself to render a user interface. Which takes a lot of code to get anywhere!
And I haven't quite got my head around how its organized.
I'll be studying it over the next month or so, starting today with its "boot" system.
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@alcinnz i wonder if it is grub but my desktops bringup and boot process is rediculously slow, time to show Apple Logo, takes a while, afterwards it takes again a lot of time to show the grub menu, then on kernel select it takes forever to show the ubuntu encryption unlock screen - in contrast decrypting my entire lvm and time to show ubuntu login screen, and launch ubuntu desktop after logging in is way faster. i surprised i am the only one complaining about grub speed
@goatwildernesscollective If it takes a while to show the Apple logo, its not *just* GRUB.
Its entirely possible that GRUB's part of the issue, but from those symptoms I'd say that there's an issue in your BIOS. Which unfortunately is not an easy fix.