In case no one familiar with the internals shows up, here are some pointers if you want to dig: the configuration man page[0] has a prefork option, and nothing

In case no one familiar with the internals shows up, here are some pointers if you want to dig: the configuration man page[0] has a prefork option, and nothing thread-related: prefork number When using relays, run the specified number of processes to handle relayed connections. This increases the performance and prevents delays when connecting to a relay. relayd(8) runs 3 relay processes by default and every process will handle all configured relays. The source[1] seems to be quite clear; relayd(8)[2] describes the main notions ("entities": relay, protocol, etc.) involved in the configuration/source. [0]: https://man.openbsd.org/relayd.conf.5 https://man.openbsd.org/relayd.conf.5 [1]: http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/relayd/ http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/relayd... [2]: https://man.openbsd.org/relayd.8 https://man.openbsd.org/relayd.8