Exactly what is happening?

lagggg with online multiplayer. i can play a lot of other games fine. Dawn of War, Counter Strike Source, all with high graphic settings. Battle for Middle Earth 2 runs fine single player, its the multiplay that is laggy. I have the same problem with Age of Empires 3. Keep in mind I don't have all of these games instaled and my computer is or should be in working order. Arg...

The best thing I could tell you to do would be to search the FAQ's on those individual sites for any tweaking issues.