Your boot isn't slow for no reason, it just hasn't told you why yet ...
Unless your computer is pretty old, it probably uses UEFI (Unified Extensible Firmware Interface) to boot. The idea is that a bootloader picks up files from an EFI partition and uses them to start ...
For some time now I have gotten a slow but steady volume of requests that I write about UEFI firmware and EFI boot relative to installing and maintaining Linux. As a result of a casual comment I made ...