[ThomasWaldmann]

I agree that a multithreaded borg could utilise resources better, esp. IF you have a lot of changed / new data to back up.

But OTOH, for many users this is primarily the case for the first backup, but not for their daily / hourly backups when most files are unchanged - for that, I guess speed is I/O bound and all your CPU cores won't help you with that.

So for N-1 backup runs, it just works good enough already for many users. And for that 1 initial backup, some patience helps. :-)

Implementing MT is planned since long, but due to the above, other stuff had higher priority.