@dangillmor
I hear ya. My hard drive stayed pinned at 100% for 10 -20 minutes after a restart. It is a "known issue." I fix it but when they patch Windows 10, it breaks again.
It has been going on since 2019. I finally had to buy a Solid State Drive so the computer wouldn't slow to a crawl for 20 minutes (BTW, if this happens to you here is a list of a bunch of fixes. Not all work on all computers it's maddening!)
https://answers.microsoft.com/en-us/windows/forum/all/windows-10-100-disk-usage-fixes-2023/c8156ca3-a295-469f-bb31-c3b7d634cdfc
If only they would bring back a simple OS, like Bob.