Anybody know of some software that will optimize the IP settings on an XP system for sustained network streaming?

I hear that by default it has some kind of 20% cap or something.

Don't have a link but I've used two tools:

Dr. TCP and TCPOptimizer

You shouldn't have any problem finding downloads to them.

This thread has some info

Okay, I downloaded TCPOptimizer and ran it, using the "optimal" settings it discovered.

I also disabled the Quality Of Service Packet Scheduler.

Should that eliminate any possible bandwidth limitations?

That's all I did when I set up DVArchive as well, and it's always worked well.

I don't think anyone can say that alone will eliminate the possibility of bandwidth limitations, however.

That story has grown to almost urban legend quality, I used to hear about it at least weekly. (I work as a network admin, but also do some support for some users)

Think of it this way, 100 mbs is more than enough to stream video, the trick is to keep the rate of packets low, so you want the size of your XP packets to match whatever you are sending to, otherwise your packets might get split into two, doubling the traffic caused by tcp headers...

most optimizers are going to optimize that for ISP connection, not the replay. (although I'm not saying they are different though...)

XP Bandwidth explained