New
#31
Sorry for getting back late. Had to shutdown for a while during some "thunderboomers". Last week was a soaker for the entire region. This was another short round.
It could be that because of the AHCI change, it's allowing more I/O to happen and the CPU isn't waiting as much for the drive. I would leave it at AHCI for the time being and keep monitoring stability and speed. Your image in Post #13 was beneficial in determining the backup.
Next up:
What AV products are you using?