HDD performance on Windows just died after some Windows 10 update. Sure, it took two minutes to boot 7 of an HDD, but once it was going, Explorer ran fine, and Firefox would run fine after that (probably cached after boot).

Same goes for day one Windows 10 (they probably didn't touch the relevant parts). I remember having to deal with a Windows 10 machine on an HDD, and it was mostly fine after it booted, but even clean installs on more recent version are just horrible. There's probably been some optimisation done which works fine on SSDs but just thrash HDDs, and HDDs as boot drives just aren't a thing anymore (within margin of error), so it didn't matter.

The fact that they've managed to throw so much bloat on top that even SSDs start struggling though, that really is something.