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As the Internet continues to expand and eCommerce develops, Web applications are becoming increasingly important sources of revenue. A literature survey revealed that users are not tolerant of delays of more than 10 seconds when using applications and only 52% of Web applications meet their performance targets when launched. This paper contains a study of the performance testing of one Web application. It concludes that performance testing can predict performance problems and, if started early in the life cycle, with a close working relationship between the developers and testers, it should enable service-affecting performance problems to be avoided. Simply specifying high-performance hardware or particular software technologies did not result in good user-perceived response times in the case study. [PUBLICATION ABSTRACT]