My guess is that this blurb is relevant: > rack-mini-profiler runs in the development environment by default in Rails apps. We're going to enable it in product

My guess is that this blurb is relevant: > rack-mini-profiler runs in the development environment by default in Rails apps. We're going to enable it in production, and hide it behind a URL parameter. You can also do things like make it visible only to admin users, etc.