I don’t measure req/sec here, but at one point, I had 2.8k visitors in an hour. Before rescaling, it was running on Hetzner’s CPX11—2 vCPU cores shared with a few other Rails apps. (I didn’t expect it to go viral at all)

I forgot to mention that yes, it's built with Rails. https://weuserails.com/ruby-on-rails-websites/we-use-rails