I would like my CB2 to run as fast as possible. It does not matter whether I boot from NAND, SD, or HDD. For the kernel to run the fastest in the long term, where would be the best place for the OS to run from... I assume it will either be NAND or HDD.
Never worked with the NAND. If SHOULD be fast, but limited.
SSD is always fastest. HDD comes a close second.
Thing is not only reads but also writes for all the logging unless you have an OS that you turn off all logging.
Read the posts on SATA booting to see how to boot directly from SATA.