The CD-ROM is connected to
ahcisata0 port 4 isn't it. That will be slower than an HDD:
atabus1 at ahcisata0 channel 4
ahcisata0 port 4: device present, speed: 1.5Gb/s
cd0(ahcisata0:4:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133) (using DMA)
unicorn and ACPI should be enabled or disabled?
In the BIOS? Yes. (why would you want to disable this?)
[ 24.896156] /: replaying log to memory
[ 26.566807] /: replaying log to disk
This indicates an unclean stutdown, and while WAPBL should fix any FS issues, I'd would still do
fsck -f /dev/rdk1 in single-user mode just to be safe.