I found the start-up and reset time short, but not remarkable
bootdelay was 3-4 sec, and OS selection 20 sec.
You can boot OS4 in less than 20 sec. Mine boot in about 12-15, and a soft rebbot takes only 7 seconds.
OS4 is simply the best AmigaOS update ever, from the video you don't see many of the new features of OS4, this was only a show.
AGG imho is quite impressive.
I'm really happy of my A1, AmigaOS PPC was a dream long awaited. The best thing is to try it at a show.
S4 really needs a proper directory lister as found in Windows' Explorer (well, not this particular program, but more the idea behind it ) or DOpus.
Dopus OS4 PPC native is coming.