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[jamieburchell]

In my experience and from what I've read, Vista is slow at copying files in general. Performace was improved greatly in Service Pack 2. Are you running that?

[live_strong]

i know im bringing this up for the dead, but i found it via google...

so i was transferring ~10GB of data off my windows 7 laptop to the DNS-323 via a wire connection.
as the OP experience, data transfer started off fine, but then the speed dropped right down to under 3MB/s. 
after logging into the DNS-323 i noticed that Jumbo Frames were enabled, i decided to disable them as recommend in this thread. 
i made the change while copying the files over and i have noticed the transfer rate slowly increase after doing so.
currently the files are moving at 6.80MB/s and the speed keeps increase...7.01 MB/s now (a 0.20MB/s increase in under 30 seconds). 

as a result the estimated time has dropped from 50 minutes to under 10-thanks for the suggestion!

[luckster]

I noticed that the heat build up on the DNS 323 also slows down the system. This is probably the reason why we get high speeds initially and the speed degrades after some time. I opened the front cover and put a fan to help reduce the heat and I noticed about 1MBPS improvement for every 1C drop.