This morning I got to watch my 13.3 (ZFS zroot)desktop take 14 minutes to rsync about 21GB of data to a locally attached UFS disk with a steady 85%-88% CPU usage. Both parameters double last week's typical run. I have a BE to "fall back to" but this morning's boot gave the attached message prior to mounting the UFS backup disk. I answered "y" because this was the UFS disk and not the only one. To be honest I've not yet read anything about the benefits of this mapping but it's modified the UFS system; only the UFS disk hopefully. The performance was disappointing. The machine is ancient but performed better at this task before than today. Data itself is on a server so nothing is lost, and I have a second disk which I won't touch until next week's backup where there's actually new data to rsync. Perhaps this event was caused by the initial remapping of the UFS disk. General desktop performance appears to be fine. I rebooted into 13.2-p10 to post; so far that's fine too. I don't know what changes took place in using the new Open-ZFS in .3 but assume they're hard written to the system disk block structure. If time allows I'll use another disk and try the backup without agreeing to updating the UFS filesystem but that would be a new dump of 800GB and would take more time than I'm inclined to devote. Still nice to see a new release.