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Why is copying large files over the Network so slow in Vista?
This is really strange but have you noticed Vista copying large files over network slower than when you did it on XP? This is true in some cases. Well I cannot confirm it as being true in only large files, but it is the most noticeable in large file transfers.
This happens mainly due to Vista's "Auto Tuning" - a smart feature that reacts to changes in the network by tuning the receive packet size (supposedly to increase stability of receiving the data). However this Auto-tune has a mind of its own and sometimes it seems to slow data down for some odd reason. Unfortunately there is no way to tinker around with the auto-tune setting (It is on Auto after all!). So the obvious solution...disable Auto Tuning in Vista.
1. Click on Start button, type in "cmd"in the "Start Search" .

2. Right-click "cmd.exe" , select "Run as Administrator".

3. Once command prompt is open type the following: netsh int tcp set global autotuninglevel=disabled
If in case you need to turn it on again: netsh int tcp set global autotuninglevel=normal
You should get a confirmation.
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