After about a month of having a sticky server, where just every other time, I’d see a blank page here, I finally found out what was the matter: A PLUGIN! Somehow one of the Flickr plugins that provides images for the sidebar was interfering with the normal behavior of the server.
It hasn’t cured all my server problems, yet. But I’m hoping that response times will improve again. If you have any issues, drop me a line at the contact form.