I have noticed this problem on two different servers that we have. It appears that the server.nlm run the CPU up to 75% utilization and holds there. During this time the logins screech to a halt. I fixed the problem last time by simply setting up a new server, however this is impossible to do now. I have compression turned on on this server and I feel like it might have something to do with that. I appreciate any help you guys could give me.