The M1 Pro / M1 Max feature an 8P/2E configuration compared to the M1's 4P/4E.
So the number of efficency cores is halved vs the M1.
1] Are 2 efficiency cores sufficient ?
2] And how many cores does MacOS take to run ?
A couple weeks ago my mid-2010 Mac Pro started getting extremely slow at times. Restarting would temporarily fix it, until one day it wouldn't get past the apple logo progress bar screen. So I took it in and Apple ran a diagnostic and told me that it's unlikely to be the HDD but "something else"...