What role service should Priscilla install on IIS to enhance Web app loading performance?

To enhance web app loading performance, installing the Web Server Performance role on IIS is the most appropriate option. This role is specifically intended to improve the speed and efficiency of web applications hosted on the Internet Information Services (IIS) platform. It includes features such as dynamic and static content compression, output caching, and request filtering, all of which contribute to faster response times and a smoother user experience.

For instance, dynamic content compression reduces the size of the data being sent to clients, while output caching stores frequently accessed data to reduce processing times for repeat requests. Both of these features play a crucial role in optimizing load times, making content delivery more efficient.

While other roles such as management tools, security, and FTP server may add functionality to IIS, they do not directly impact the performance and speed of web applications in the same way that the Web Server Performance role does. Management tools are primarily for administration, security roles focus on protecting the web server, and FTP functionalities are centered around file transfer rather than enhancing web application performance.