Article ID: 842264
After you install Microsoft Windows XP Service Pack 2 (SP2), you may experience a significant slowdown in network performance and in data throughput on your computer.
This issue may occur because Windows Firewall does not work correctly with Large Send Offload (LSO) if all the following conditions are true:
To work around this issue, disable the Windows Firewall/Internet Connection Sharing service. To do this, follow these steps:
Large Send Offload (LSO) is a technology where the work of segmenting data into network frames is performed by the network adaptor instead of by the TCP/IP stack. With LSO, TCP/IP sends very large data packets down to the network adaptor driver and the network adaptor hardware. The network adaptor breaks up the data into smaller network-sized frames. This both increases the speed of high-end send operations and decreases the computer's CPU usage because the work is performed on the network adaptor itself. LSO must be implemented in the TCP/IP stack, in the network adaptor hardware, and in the network adaptor driver.
For more information about LSO, visit the following Microsoft Web site: