I have an Ubuntu 10.04 server that's going a bit slow. It's very slow to log in via SSH, and it's very slow when making edits via a Mediawiki instance installed on there.
For normal read access to the hosted website, it's fast (I have APC installed, FWIW), and it's also fast with SSH once I'm actually logged in.
What sort of things should I be checking as possible sources of this problem? I need to diagnose it remotely.