Which type of requests allows for a more fluid user experience in Reactive Web Apps?

Asynchronous requests are integral to achieving a more fluid user experience in Reactive Web Apps because they enable interaction without blocking the main thread of execution. When a web application sends an asynchronous request, it can continue processing user inputs or updating the interface while waiting for the server response. This results in lower latency and a more responsive experience for users, as they are not forced to wait for a task to complete before interacting with the application further.

In contrast, synchronous requests halt the processing until the request completes, leading to a less engaging experience since the application may freeze or become unresponsive during that wait time. Delayed requests introduce unnecessary waiting periods to the application's operations, which can negatively impact usability. Immediate requests might suggest that the application processes requests instantaneously; however, they do not inherently improve user experience if they still block the user interface or lead to long wait times.

In summary, asynchronous requests are crucial in enhancing the user experience in Reactive Web Apps by allowing the application to maintain fluidity and responsiveness, directly contributing to a smoother interaction.