its not the CPU, my friend runs a CS server, and at lan parties its fine, when half the people are on a lan and half are coming in throught the cable modem. But if it gets to more than 12 people on cable it gets real slow. Its a k6-2/400 with 128mb running win2k advanced server, its more of a bandwith thing, you are gonna need 384kb/sec upload speeds for 20 people.