One of the devs mentioned that the biggest draw on server resources is the direct web interaction, and loading pages, not the behind-the-scenes federation, where the database queries are simpler and the actions can be queued up and retried as needed. (I think apps would have the same issue since the server’s going to be doing the same kind of massive database queries to build your feed.)

If your comment takes a few minutes to get from your home server to another one when the site’s overloaded, it’s not a huge deal, but if your comment takes a few minutes to get from your browser to your server, the site’s basically down.

So moving yourself to a new server takes over the entire real-time load you would have been using, and the additional background load of sending threads to/from your server is a lot smaller.