pixelfed.social is running on a single 16G intel optimized droplet, with an 8G database server (and another potential replica)
we should have no problem accommodating a few thousand new users, last nov we peaked at more than double current MAU
that being said, I'm ready to scale out, and laravel supports read replicas via easy config (and horizon is scalable)!
pixelfed federation is highly optimized (inbox and async concurrent outgoing), as are most APIs except the home feed, which I'm fixing