Checked the boot time again since I was surprised by a previous statement of 1:45 "only" but seems to be an exception (or measuring fault), it feels longer and I stopped the time again:
0:30 circling dots
2:15 circling dots gone
2:25 welcome screen (picture)
3:00 Desktop appears !, cursor shows "busy circle" on click event
3:25 Desktop ready to react to mouse events
So, better than the 4,5 minutes weeks ago but still way behind the significantly less than 1 minute before the "upgrade" to PD14.
Technical Report: 301155359