To CobraBlade! Many thanks for your great help! I rendered the scene with my iMac/P11 and stopped after an hour (approx. a third of time, right side of my picture). Then I rendered with my usual settings (left side) 10 minutes but a lot poorer quality. So my decision is to try the MacMini even when I wait a bit for new developments of Mac (M2/MX). Thanks also to the other participants of the discussion, though it's less helpful if I ask about an Ford-car experience and you tell me about a Mercedes. I think it's a little bit about two partys (PC against Mac). But it was nice too and without Parallels it's sometimes not as easy as in the PC-world. I watch it. Kind regards and once more many many thanks.