Profiling Ruby on Rails Applications with Rails Debugbar

When you're building Rails apps and having fun building new features, it's easy to lose track of what's actually happening behind the scenes. You don't always know what queries are being run, how long they're taking, or how many objects Rails is allocating during a single request. We often don't notice these issues during development, as we typically work with small data. However, in production, where you are working with larger datasets, all these problems can lead to slow page loads, wasted memory, and a frustrating user experience. When performance starts to drag, the blame often lands on the framework itself: "Rails doesn’t scale.".