I was suffering from slow ssh logins — it’d take 20 seconds to get a login prompt. I noticed this process, kdm_greet, running. Google found a posting message that said the problem is kdm_greet is having to examine a bunch of fonts:

kdm_greet takes a long time to run due to out-of-date font-cache

It didn’t seem reasonable but I went ahead and ran:

Login was so fast I thought at first nothing happened.

Well, it started to get slow again. I monitored what was happening and it looks like sshd was taking a long time (30 seconds). That made me think of reverse DNS lookups. I checked

and it had an out-of-date nameserver entry. Removed it and things are fast again.