After checking out Sio's notes in the Tech Section, I've tweaked my system to what he's recommended, and I can play when there's 16 ppl to a side again, even 18 with some lag. Of course, I'm not seeing corpses, sprays, flashlights, or bullet holes, *but* it has helped my performance overall.

I would recommend it to anyone who has an ancient computer like mine, or is generally suffering from lag.