Caching

The practice of storing previously requested data in a small, high-speed data layer and returning it, instead of requesting the data again, is called caching. Caching is a vast and complex topic, so this book will focus on the cheapest wins for your application rather than attempting to cover everything.

Caching both reduces replicated demand for compute and speeds up applications. It is also very useful for reducing serverless backpressure in two ways: first, by reducing the number of requests that hit the backend and second, by reducing the number of requests that hit "weak" resources.

Client-side caching is the easiest way to have an immediate impact on the number of requests you see per second, and also the easiest to understand in terms of requirements. It also immediately improves the performance of your application for your end users, as they receive data much faster. However, client-side caching is frequently done badly or not at all. Serverless has a great way of highlighting...