Web applications have become bigger and more complex day by day. We have a web version of Photoshop now, and there are even more complex applications that exist on the web. The web was not conceived for these kinds of applications. If your application is very big, and you are loading your whole application at the first load, chances are that your application has bad performance. What if you can load only that part of JavaScript that is required for that particular page/view? This is where lazy loading comes in. Lazy loading is the process of loading only part of an application that a user wants to see. You can lazy load not only JavaScript but also CSS.
In Angular, you can do lazy loading using router configuration. ...
