The growing demand for quality and performance has become a discriminating factor in the field of web applications. Advances in software technology and project management have increased the amount of web applications which are developed under these aspects. At the same time the research in web performance simulation and prediction is focusing on complex modeling methods and techniques rather than providing easy to use tools to test and ensure the performance requirements of today's and tomorrow's web applications. As a tool for these tasks, the automatic web performance simulation and prediction system (AWPS) will be described. The AWPS is capable of (a) automatically creating an online web performance simulation and (b) conducting trend analysis of the system under test.