I've scaled a single rails server to 50k concurrent, and so if Rails is the theoretical bottleneck there, and we base it off scaling my meager efforts, that's o

I've scaled a single rails server to 50k concurrent, and so if Rails is the theoretical bottleneck there, and we base it off scaling my meager efforts, that's only 20 servers for 1 mil concurrent, or around $1000/mo at the price point I was paying (heroku). Rails these days isn't the top of the speed meters but it's not that slow either.