Have all Half-Life 2 mods that have come out have lag issues? That's all I ever hear about.
Without being too technical about that question: The problem is that most of the teams have a bunch of beta testers to check the game out, report bugs, etc. One thing you really can't test is a so called "stress test" for the servers. Which means run the game and the server under public conditions. Cause you need alot of players to do so. Especially at that point you release your mod to the public and let them "test" it. That is why performance problems show up after the first release. Really not a big deal, cause all that can be fixed. We at ES had the lag problems, which is going to be fixed. And I am sure those guys at Iron Grip use your feedback, too, and fix the bugs that have been reported.