There is no up to date information avaliable, All you have is some posts 10 years ago.
For beginner to get to know this system is very hard task.
Mailing lists don't help with big issues, usually people ask about some network card or some laptop compability.
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I don't see any replies to this tread.
http://marc.info/?l=openbsd-misc&m=134565961307929&w=2
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I did read about some people use it for high traffic servers but not many.
Any way, I'm going to try it and see how it goes.
Thanks.