The initcwnd change is helpful on any host that has more than 2 segments worth of data ready to send at the beginning of the connection. So a client that wants

The initcwnd change is helpful on any host that has more than 2 segments worth of data ready to send at the beginning of the connection. So a client that wants to send lots of data would benefit from the change. For 99% of web browsing, the client's request fits in one or two segments and so would not benefit from the change.