Feature Request: Multi-threading

[Chewie9999]

I know this may be a non-trivial request, but it would be great if the program could use more than one CPU.
Obviously one could run multiple commands on different paths (which is what i'm doing right now), but that is still not as efficient as it could be.
It would also be good to have an option to limit how many CPUs it uses so you can control performance a bit.

Thanks!