What is a loading waterfall in the context of lazy loading, and why is it problematic?
A loading waterfall in lazy loading is a sequential chain of dependent lazy-loaded modules that block each other. This occurs when one lazy-loaded component imports another lazy-loaded component, which perhaps imports yet another, creating a cascade of sequential network requests. This is problematic because each request must complete before the next one starts, significantly increasing the total loading time. To avoid waterfalls, you should structure your code to allow parallel loading of independent chunks and carefully manage dependencies between lazy-loaded components.