i may
very well be mistaken as my knowledge of these things is about next to nill, but wouldn't data copied from one NASdrive to another transit through the computer which sent the copy command? So speed would be limited by both bandwidth and cpu power? if you do not have a gigabit network then 1MB/sec sounds consistent wi someth my experience.
Bizarrely, comp-->NASbox transfers are slow (max 3 MB/s), but NAS-->comp transfers are much quicker (up to 8 MB/s). I therefore always use FTP to get data to the NAS, as I would get speed of about 10-11 MB/s.
I read somewhere that slow comp-->NAs transfers were due to OS X (which I am on) somehow, so on the other hand being under Windows you should not suffer from the same problem.
Do all the mass copies at night
Having said ALL that, i only have NASlite 1.5, and I don;t know if transfers have been improved with release 2.