After replacing DVD-ROOM with SSD with rack from Taobao, below are the optimization applied,
The first part reduce the unnecessary write,
- disable atime
- disable journaling
- less sleep
sudo pmset -a hibernatemode 2
Move seldom used files to the original hard disk.
- ~/Library/Application Support/MobileSync (? iDevice ???)
- /Library/Application Support/GarageBand (1.4GB)
The cost is around HKD 200. The result is the boot time is shorter compared with my Macbook Air, subjectively.