Spring Roo appears to be a great framework with true order of magnitude productivity improvements. However I am reading that Roo aims mainly at rapid prototyping or smaller applications.
My question is, whether Spring Roo has proved to be suited also for larger, production-ready web applications, subject to important scalability and performance requirements.
Spring Roo is a development tool, it is not a framework.
There has no sense querying about if Spring Roo has been proved for scalability and performance for any production web app because it is not a runtime framework, it is a development tool for development time.
Spring Roo creates web apps based on Spring Framework, Spring MVC, and other frameworks that have been proved to be suited for larger production-ready web applications.