Here is the presentation which provides more context than the slides alone: https://www.youtube.com/watch?v=3E9ga-CylWQ

I've watched it before and it is compelling; however, at the end of the day, an OS that tries to take security seriously is probably better than one that doesn't. The OpenBSD code is small and I suspect that the defects/KLOC is far less than other projects capable of routing. I'd love to hear more critiques for using it as a home router though.

Yeah, the whole Spectre/ Meltdown was handled very badly by Intel. Illumos, OpenBSD and others basically found out from the media/ mailing lists of other projects where people were told under NDA. Not a great position to be in, they did, what they could in the shortest time possible.

Yes. If you need 10x less performance, you'd choose OpenBSD. Otherwise you'd go for DragonFly

I have no doubt that DragonFly could handle higher throughput but for a home router at 1GbE or less, OpenBSD seems ideal assuming it doesn't add additional latency. Benchmarks are hard to find; if you know of any, please let me know.