I ran A9LH on five 3DS as of now, 3 new and 2 old, booting time is more noticeable on old than new obviously, but splash screen lasts always at least a bit more on EmuNAND, and it's on purpose as there isn't any additional delay to boot the system. If you want to have a fixed time with the splash you can still add a delay and compile the sources.Well, most of people here has a UHS-1 microSD. I've a 32GB and about 10-15 CIA games, and the splash screen on EmuNAND is as fast as SysNAND for me.