A Rails dyno isn't what it used to be. In mid-2010, Heroku quietly redesigned its routing system, and the change — nowhere documented, nowhere instrumented — radically degraded throughput on the platform. Dollar for dollar a dyno became worth a fraction of its former self.
James is one of the best writers out there, always read when you see his byline. I remember enjoying this kerfuffle on Hacker News back when it was happening, so I thought I'd share it here as a blast from the past. It feels like there used to be more companies like Rap Genius, with eccentric founders, engineering blog with an attitude, that threw a rails app up on heroku and blew up. I'm nostalgic!