I was searching in the past (past few weeks) for a program/software which is multithreaded and it is able to extract rarparts using multi threading. What software's i've already tried?

unrar, unrar-nonfree, rar, 7zip

It seemed to me that none of them is multi threaded and therefore they are all slow. The solution would be needed in cli format so if not necessary the no gui. Is someone aware of something like this? I asked on other irc's for suggestions and they told me, that the best is to write one myself. I may be agree with them, but i don't have these type of knowledge to achieve this task.