True, but that's expected with MS operating systems. For the servers I maintain, 2000 has been night-and-day better than NT 4. We didn't deploy 2000 until SP2 was out. We're just now rolling out Server 2003 in a major way, since SP2 has been released.
You'll love the new IIS if you're using it, with different web sites and different worker processes, each easily tuned for resource usage. Watch out, SSI is implemented very differently since the previous version was Swiss cheese for security.