> Recently I noticed that after a longer uptime, shutdown takes a while.
Do you mean `shutdown -r`, `shutdown -h`, argless, or something else? I've seen similar issues on-and-off with -current for the past several months, but it seems to happen way more often with `shutdown -h` and *not* `shutdown -r`. It's unfortunately difficult to reproduce, but it seemed to be vaguely associated with how much file access had occurred, not just uptime.