
The most significant parameter for TCP/IP tuning is the TCP Receive Window (RWIN). Most other tuning attempts usually do little or no benefit and may actually cripple proper TCP/IP connectivity as exemplified by so called MTUTweak programs that aim to optimize the line for dial-up use. If you have previously used one of these programs, I suggest you remove the registry changes done by them. Typically, these programs lower your MTU (maximum transmission unit) to 576, reduce TCP Window Size to as low as 2144 (an absolute no no for broadband connections)
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