Windows Performance Tuning

1) Recommended by many sites. For all type of roles (simple pc to mail server...etc..).
KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\TCPIP\Parameters
TcpTimedWaitDelay REG_DWORD
Set the value to decimal 30, which is Hex 0x0000001e. This value sets the wait time to 30 seconds.
Default value: 0xF0, which sets the wait time to 240 seconds (4 minutes).
Recommended value: A minimum value of 0x1E, which sets the wait time to 30 seconds.

If you run the command netstat -an you will see network connections in the TIME_WAIT state. The previous parameter indicates how long these connections can stay in that state before being recouped by the server.