When using Reactive Web Apps, what is a significant feature?

In Reactive Web Apps, a significant feature is their optimization for fast loading by utilizing AJAX (Asynchronous JavaScript and XML). This is crucial because AJAX allows the web application to communicate with the server in the background without requiring a full page reload. This means that parts of the user interface can update dynamically as the user interacts with the application, resulting in a smoother and more responsive user experience.

The use of AJAX enhances performance and reduces wait times for users, making the application feel faster and more efficient. This approach aligns well with modern web development practices, where user experience is a priority. By leveraging AJAX, Reactive Web Apps can maintain a higher level of responsiveness, which is essential in today's fast-paced digital environment.