How resource intensive is the federation part of running a lemmy server?
I ask generally out of curiosity. I was just thinking that as big social media fractures, old school isolated forums might become "cool again", and that one of the achievements of lemmy might be as a nice platform for simply running a forum for whatever community you want all without needing to worry about federation.
If it turns out that work of federating data is a substantial part of the resource overhead, and that an isolated server would actually be quite efficient, that'd be quite a nice feather in the lemmy cap I'd say. Hexbear seems to have been using lemmy this way for a while and it seems to have been successful too.
The Lemmy Easy Deploy script available at GitHub supports Arm64 in theory. In practice, some required binary refused to run on my Pi 4 so I think it's still a WIP.