It's not really UEFI issue, but what modules were loaded, how it was configured/wired up - and sometimes it ends up serializing on slow boot of some components (like DDR5 memory), and weird crappy add-ons from manufacturer.
yeah,
DDR5 training is a huge (UX) issues wrt. boot times (mainly on desktop systems).
sure only "once" if your system is correctly setup, but I have seen too many cases of buggy motherboards not properly handling this
and the biggest issue is the transparency, i.e. you don't see that it does DDR5 "training"/"parameter self adaption". It looks like it's "just stuck" in early EFI.
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I wasn't aware of DD5 training being expected to take that long often. That would explain why the box that is my current home-lab taking so long to boot when I first put it together (and on one other occasion) but behaving normally every other time. Every day is a school day!
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