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Windows XP: Increase TCP/IP Widnow Size to boost download performance 

Dr. Xi
Joined:
04/09/2007
Posts:
753

June 26, 2009 23:34:54    Last update: July 03, 2009 02:27:31
This registry key determines the number of bytes a sender may transmit without receiving an acknowledgment. If left unset, the default size is 8760 (2238 hex). For reliable networks, this size is almost always too small. I increased it to 65535 (FFFF hex) and my download speed for a big file increased from about 450Kbps to about 8Mbps! 

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]
"TcpWindowSize"=dword:0000ffff


Note:
This hack doesn't work for Windows Vista.
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