Yup, it's still running on the same VPS. I do plan on offloading PDF file serving eventually, to a 'CDN' of sorts that I'm working on, but that's more for storage space reasons (especially cost-wise).

The only real 'optimization' was this classic one:

    server.max-fds = 2048

If you forget that, you're going to have a very bad time when you get hit by a serious traffic surge :)

The full configuration is here: https://gist.github.com/joepie91/e5bd63710b5910d2287a

It's really just a mostly standard config, some things pieced together. PHP is configured in on-demand mode, though - iirc, the default PHP configuration that ships with lighttpd on Debian is not.