So, noisy neighbors mean that you can't get predictable performance from shared dynos; simple math indicates that even one lagging dyno out of 20 will kill your

So, noisy neighbors mean that you can't get predictable performance from shared dynos; simple math indicates that even one lagging dyno out of 20 will kill your 95th percentile response times. The trouble with the dedicated dynos is that you need at least two for high availability (to not miss requests on dyno crashes / restarts). That puts the minimum cost per service at $500/mo. Not necessarily an issue with monolithic apps, but quickly untenable with microservices.