I use one of these as a firewall (running OPNSense) and they're very nice but the CPU is indeed _slow_. It's plenty good enough for everything the firewall does but booting it up takes minutes and that's saying something for FreeBSD.
Odd. I run openbsd on a similar one, and booting is reasonably fast. I even have a linux vm running on it in vmd, and haven’t noticed performance issues with that either.