Windows Booting very slow after 2004 update ,

@RoyGray731:" This is something you can easily try on your system.

If you want to turn it off, click on the Windows start prompt and type "Defrag".  Select the Defragment and Optimize Drives app.  For each drive, ensure that Scheduled optimization is turned off."

Many thanks for that interesting and useful observation. That could be one of the many things "getting in the way" and fighting with the "normal" expected performance during normal working of users systems. It is certainly worth trying, as modern disk really should not cause issues if the odd bits of fragmentation are there. In any event, I always thought the NTFS writes were queues and consolidated to reduce fragmentation anyway.

Your suggestion may well help those with your type of configuration.

Because 2004 is a bit immature and the drivers are not available yet for many manufacturers, if you see a similar issue, consider rolling back to 1903/09.

https://www.yourwindowsguide.com/2020/05/uninstall-windows-10-version-2004.html

You did not need to do the other  commands as it is consistent and in sync. I suspect the errors are due to other service dependencies, and it would need to be done from a "safe mode" boot. If you still have a long booting time then it is something else, maybe a large external disk or NAS that it is trying to check out during the blank screen phase?

It's not an external disk, so that's out of the question. Personally, I think we're all huffing and puffing & then the update will slide down the tubes and that will be the end of this conversation. 

Stay healthy man! Thanks for your efforts & helps!

@Robert Mumps - yes, if the first command show it is consistent, that is not the issue. The 2004 Feature Update was a BIG update, and different configs are behaving differently, and the majority (especially those with SSD disks) are OK. I have been prodding the Performance Group (AskPerf) to start topics and dialogue, but I am just a mere user, so don't hold your breath for fixes. It depends on how many users shout loudly at MS of course... (and how much telemetry they get back that shows issues).

I'm one of those who is using an SSD & that's what's making me think as you suggest, a big update brings a lot of lovely griefs with it. Thanks for the reply!