I decided not to comment on it directly because it is part of a long list of supposed reasons why Surface supposedly sucks, many of which are spurious at best, I was just going to assume it was an exaggeration, and not a request for help diagnosing why Windows8 has a 90x slowdown in network file copy speeds compared to Linux, particularly since I know from experience that copying large files is an inherently disk and network bound task and that the code for copying network files in Windows RT is the ostensibly the same as copying network files in Windows 7, which the op himself says is fast.
Maybe it's specific to Windows RT or Surface RT?
Regardless, rjdohnert gave props to W8 and Metro; why would you think he was being disingenuous about the file copy? He's been a C9 member since 2004 and I haven't seen him flooding the forum with negativity about Microsoft. Why are you always so dismissive of any issue or complaint about Microsoft's technology?