It is _ridiculously_ slow on first boot after a cleared CMOS due to the extra memory training - as in minutes. 20 seconds to post is the normal time after that initial boot and a decent time at that for these boards.
I wouldn't mind so much if suspend & resume worked.
Not sure why they take so much longer. Zen 3 was definitely faster for me as well. I’m not holding my breath that it’ll get significantly faster but I suppose it’s possible an update could do it.
Its probably just bugs in the 5.15 kernel I'm still running. Full zen 4 support wasn't added until linux 6.0, so I think I'm doing well as it is. Fingers crossed suspend is fixed by a newer kernel.
Given everything else in the system seems to work fine, I'm not too fussed.