I've removed the FreeBSD, NetBSD and OpenBSD kernel config files I used to have in /pub/X20, since custom kernels is a great way to shoot oneself in the foot, and the gain in performance is so minimal that it's not worth it.

I've stopped bothering, and so should you — generally.

Go look at solarflux.org/pf/ and optimize your /etc/pf.conf instead, much more fun, much more useful.