Optimizing for a 120 kbps Network That Drops: Do Less, Cache with Boundaries, Survive Offline

Reality check first: median fixed-connection download in Cuba is 3.48 Mbps vs 104.43 Mbps worldwide (Ookla via DataReportal), and the working condition is closer to 120 kbps, dropping at any moment. The wrong question is "how do I make my app faster?". The right one: How much work does my app actually need? Optimization starts by not doing: not...