I find this hilarious. Are people so impatient that 2 minutes is an eternity. If you want faster you should go beyond upgrades and get a machine with at least 4-6 core processor, 12+ gb ram and nvme storage. Complaining about and attempting to improve an old computer's boot time, which is limited by the hardware not the os, is counterproductive. I remember waiting 3 to 5 minutes for windows to boot (95c and 98). 2000 and xp improved upon that somewhat, but boot times have come a long way.
Zorin 16, after boot, is still the fastest Ubuntu based distro available today. If you want to speed it up further, drop gnome and move to Cinnamon DE or better yet for your hardware, install XFCE and enjoy lite before it's released... only thing missing is the Zorin official layouts. You can get either here on the forum from the Tutorials & Guides category:
https://forum.zorin.com/t/top-x-1-things-to-do-after-installing-zorin-os-16/5938/24