One thing is sure - performance matters! Blocking the main thread of an application, causing frame drops, is one of the most efficient ways to get rid of a significant portion of our users. Fortunately, the day could be saved, thanks to functional programming. Coming with, at first, abstract ideas, functional programming brings the concepts of immutability and purity, which combined together can dramatically improve the rendering performance of our application. In this talk, we'll apply concepts from functional programming in the face of pure components, pure pipes and persistent data structures. This presentation demonstrates in details how we can use them to build high-performant Angular applications.