nanobsd is incredibly slow to save
Since upgrading to 2.1 snapshots the web interface is incredibly slow to save any settings. The pages load quickly enough however clicking any save button across the web interface results in it taking ~45 seconds to complete. "Apply" buttons don't have this effect. During the save, the router still routes but is inaccessible via ssh. I remounted the filesystem as RW to add some debug to the php to determine the cause, and this act of remounting instantly fixed the slowness issue.