Speeding up Vista's network speed

If your using Vista and you have poor network performance, it could be the addition of a new feature called "Receive Window Auto-Tuning" in the TCP/IP stack.

To check the status of this feature, from a command prompt run:
netsh interface tcp show global

You should see something like:

Querying active state…

TCP Global Parameters
———————————————-
Receive-Side Scaling State : enabled
Chimney Offload State : enabled
Receive Window Auto-Tuning Level : disabled
Add-On Congestion Control Provider : none
ECN Capability : disabled
RFC 1323 Timestamps : disabled

In this example, you can see I have it disabled. The default is "Normal" on a 100mbit network, when I disabled this "feature", I went from 3mb/s to almost 5mb/s.

These need to be run from an Administrator Command Prompt (Right click on the command prompt, click on "Run as administrator" for a pretty picture see http://www.geekstogo.com/forum/Windows_Vista_run_command_prompt_as_administrator-t146674.html)

To disable it, run: "netsh interface tcp set global autotuning=disabled"
To enable it, run: "netsh interface tcp set global autotuning=normal"

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