Configuring Puma, Unicorn and Passenger for Maximum Efficiency

In Ruby, web application servers are like gasoline in a car: the fancy stuff won’t make your car go any faster, but the nasty stuff will bring you grinding to a halt. Application servers can’t actually make your app significantly faster - no, they’re all pretty much the same and changing from one to the other won’t improve your throughput or response times by much. But it is easy to shoot yourself in the foot with a bad setting or misconfigured server. It’s one of the most common problems I see on client applications.