My second computer gets double latency of my main computer, even when soloboxing.

[Freddie]

Is it possible to ping your WoW server from (say) the Windows command line? That would give you an idea of how low the latency could be.

How would I do that?

To ping a server, you open a commmand prompt box and type "ping" followed by the IP address of the server. But there are lots of forum posts that say Blizzard's servers do not return ping requests so this probably won't work.

Anyway I think that Vista has the TCPNoDelay feature off by default. I don't think it's kept in the registry, either.

If MSMQ is off, then presumably TCPNoDelay has no effect. But the absence of a registry setting for TCPNoDelay may not mean anything because -- well, check out the last line on this page where Microsoft documents TCPNoDelay:

http://technet.microsoft.com/en-us/l.../cc783904.aspx

It says, "This entry does not exist in the registry by default. You can add it by using the registry editor Regedit.exe." That means that even when MSMQ is on, Windows doesn't put that item in the registry. You have to enter it yourself.

All of this is pretty interesting because the web is full of posts and articles advising people that TCPNoDelay is a global setting for Nagle. Apparently they are wrong. It also looks like Microsoft hasn't provided any way to turn Nagle off globally.

If those things are true, there's an opportunity for some clever programmer to write an app that sets TCP_NODELAY on sockets that belong to other programs.