I'm curious. What are people here using OpenBSD for? In which scenarios would you consider using OpenBSD over Linux?
Even with top end hardware, we could not go past ~5Gb/s with simple pf rules and after a lot of tweaking. With FreeBSD or Linux, we got the 10Gb/s out of the box with similar rules.
That's for the network part.
As for userland application, it's also slower than Linux or FreeBSD, I remember benching some OpenSSL/LibreSSL based application. On the same hardware I was at 200 transaction/s (transaction ~= RSA signature) with Linux/FreeBSD, with OpenBSD I was at 150 transaction/s, so significantly slower.
Yes, those things work. You'll want to select hardware that is well supported though for the best experience.