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The Ajax model of Web applications development has rapidly gained popularity because it promises to bring the richness and responsiveness of desktop applications to the Web. Ajax implementations differ fundamentally from other Web implementations - mainly in making asynchronous requests for parts of a Webpage. Techniques routinely used for performance testing traditional Web applications must be modified and enhanced to suit the needs of Ajax-based applications. Using a general example, the authors of this article examine the unique challenges of carrying out performance testing for Ajax-based applications and offer approaches and tools for overcoming them.