JSI Tip 9731. You experience slow network performance using ADSL on Windows 2000 or Windows XP?

You have a high bandwidth and high delay network connection, like ADSL (Asymmetric Digital Subscriber Line). When you perform a network related task, like viewing this site on the Internet, the site appears slowly.

This behavior can be the result of having a TcpWindowSize that is set to low.

To workaround this behavior, set the TcpWindowSize Value Name, a REG_DWORD data type, at HKEY_LOCAL_MACHINESystemCurrentControlSetServicesTcpipParameters, to a higher number. The default is 8760, and the maximum is 65535.

NOTE: You can use REG.EXE, built into Windows XP, or installed on Windows 2000 from the Support Tools on the operating system CD-ROM:

REG ADD HKLMSystemCurrentControlSetServicesTcpipParameters /V TcpWindowSize /T REG_DWORD /F /D

NOTE: See Windows 2000 does not use TCPWindowSize when accepting a connection?