>>105674308
>how many CPU cores do you have?

You should know that only PHYSICAL cores do really matter in this memory intensive application.

In my case, the single CPU has 8 physical cores which is doubled by so called hyper-threading to 16.

I get 3.90 tnk/s on 8 cores and 8 threads
4.05 tkn/s on 16 cores and 16 threads.

Any attempt to use more threads than available cores, or to use the second CPU make the genning speed decrease under 1 tkn/s

As I said before, it is an old used HP Z840 from 2017 with DDR4-2400