There's an underlying element that isn't explored in this enough: constraint is many times useful (rephrasing of Necessity is the mother of all invention). The

There's an underlying element that isn't explored in this enough: constraint is many times useful (rephrasing of Necessity is the mother of all invention). The prevailing sentiment these days seems to be that developers don't need to reason about performance "because we can just scale it." It might be useful, or at least informative, to start with "make your app run well on a Raspberry PI" or equivalent low-power system, and then consider your performance from there.