I checked my Windows Update Driver history and System Restore. The CPU appeared to be used by the HD Audio Background Process. Rebooted and the time jumped from ~ 10 seconds to ~ 90 seconds. I noticed about a week ago that my fans were ramping up while watching youtube and the cpu was pegging. Running Win10 Home 21H1 without fast-startup, and my system usually boots in ~ 10 seconds. I run a lean XPS 8930 without a lot of installed software and a SSD boot drive. I came to the same conclusion and fixed the issue by rolling to the Microsoft High Definition Audio device driver. I can confirm this same thing has happened to two other 8930 systems in the past week! Not sure why everyone isn't seeing it, but more people may run into this issue as Win10 Windows Update is now pushing this update out as forced non-optional on some systems.
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