Network transfers are much slower than copying a file on your hard drive. Define ridiculously slow.
I have 200MB file on ASUS notebook Win7 (dunno disk speed but is < 1 yr old)
wireless transfer to Linksys router (I expect only g)
ethernet transfer to DLink dual g,n (uses n I am sure)
(probably wireless) transfer to HP Win7 (dunno disk speed but < 1 yr 2 TB disk)
I get 160-250 KB/s, per the Windows progress bar on the ASUS
I was expecting up x10 that