I had a fiddle with using jumbo frames on my gigabit network, to try and speed up transferring data from my NAS. I read up a bit about it and gather it lowers cpu overhead, so can help with NAS devices especially.
Results below transferring a 1.6GB file from the NAS to my desktop (Win 7):
1500 MTU - 22-23MB/sec (default)
4000 MTU - 34-35MB/sec
9000 MTU - 39-40MB/sec
Pretty good result and worth doing if your kit supports it.
http://www.maximumpc.com/article/howtos/how_enable_jumbo_frames
Results below transferring a 1.6GB file from the NAS to my desktop (Win 7):
1500 MTU - 22-23MB/sec (default)
4000 MTU - 34-35MB/sec
9000 MTU - 39-40MB/sec
Pretty good result and worth doing if your kit supports it.
http://www.maximumpc.com/article/howtos/how_enable_jumbo_frames