About benchmark and actual speed

[hijack]

try using option -O for optimized kernel

benchmark is "best or maximum" speed expected, but you will mostly never reach this 

it seems you are using a plain dict with passes 8 digits in length only, pure wordlist will never reach full speed due to the way hashcat works, inner outer loop, rules could speed up your cracking run depending on your wordlist

if its really digits only you could use a dict with 6 digits only and a ruleset with append 00 to 99, this should speed up your cracking a little bit

Thanks, I am using a complex and changeable password dictionary and most of them have no rules. Can I only use rules to improve the cracking speed?