Developers often face challenges with app performance, particularly with slow loading times, and lazy loading in Ionic Angular offers a solution by optimizing load times through dynamically loading JavaScript bundles. This technique involves downloading only the necessary HTML, CSS, and JavaScript for the initial route and loading additional components as needed, which is especially beneficial for larger apps that would otherwise require extensive initial downloads. Lazy loading is enabled by default in new Ionic Angular 4.0 apps, and different pre-loading strategies can be implemented to further enhance performance, such as the PreloadAllModules strategy, which preloads all modules once the initial module is loaded, or custom strategies tailored to specific app needs. These strategies aim to maintain a balance between load speed and resource efficiency, ensuring that users have a responsive experience without unnecessary bandwidth usage. While lazy loading effectively speeds up initial page loads, careful consideration is required to manage the loading of subsequent pages, especially in larger applications, which can be achieved through custom selective pre-loading strategies using Angular's PreloadingStrategy class. This approach allows developers to strategically preload routes that are likely to be accessed next, enhancing the user experience by reducing delays in navigation.