BTW, you might want to check the speed of the network interfaces and router
being used. I was seeing very slow file transfer speeds with rsync
(hint: use --progress). When I investigated I found that the speed limit
on the wired network interface on my current computer was set to 100
Mb/sec. I enabled Allow auto-negotiation on the adapter and reconnected
it to the network, which allowed it to connect at 1 Gb/sec, rather than 100
Mb/s.