merge dictionary or not?

hi,
thank to the hashcat team for your beautiful app.
my question is: to have better performance we should merge dictionarys or not?
according to mask file, when i use 10 mask in mask file we get better performance (faster) instead of use 10 mask attack in same hardware. i think initialize time is reason of this.
now for dictionary attack what we should do? for example we have 3 dictionary. is it better to merge them? and why?


have a good time...