Since upgrading to High Sierra my boot time slowed down considerably (from ~10 seconds to 90 seconds). Googling this problem suggests disabling Trim might work as a solution, which you do via the
sudo trimforce disable command, but it doesn't actually seem to disable Trim.
sudo trimforce disable and pressing
y twice, my Mac automatically reboots but after rebooting,
system_profiler SPSerialATADataType | grep 'TRIM' or System Information->SATA/SATA Express still shows
TRIM Support: Yes
I also tried to disable System Integrity Protection before disabling Trim, and that doesn't seem to work either.
Anyone got any ideas?