Lazy loading is one of the highest-leverage performance techniques in Angular. Done well, it can cut your initial bundle by 40–60%, dramatically improve Time to Interactive, and make your app feel fast even as it grows. Done poorly, it becomes a source of subtle bugs, missed splits, and false confidence. This guide covers everything, from the fundamentals of route-level splitting to @defer blocks, preloading strategies, and bundle auditing, using the patterns that work in Angular 17+ with s...