Hi there.
I have MacBook Pro 2018 with CRAZY over 3000MB/s and boot time was like 30 seconds - and now I got now Mac Mini M2 BASE MODEL which means 1500MB/s and....... boot time is about..... 7-8 SECONDS (from power button click to login screen) - both systems on THE SAME macOS!!! It is nearly the same time as MBP 2018 too to Wake Up !
HOW??!?!
I've asked Google for boot times on MacBook Pro and Air M2 and EVERYONE says average 15 SECONDS