Rails is known for many things but memory effectiveness is not one of them. By default, it loads all gems, used and unused, which contributes to the overall memory footprint. Fortunately, we can easily eliminate this waste without touching the app.
Single-page apps are all the rage nowadays. Many praise their vague technical benefits while ignoring tremendous development costs.
The larger the test suite the slower it gets. This is an obvious yet annying truth. In this article, I present a simple and generic technique for improving test suite performance (almost five-fold in my case) without touching the code base at all.