The document discusses performance testing in an agile environment. It outlines some pain points with traditional performance testing approaches and proposes performing performance testing earlier in the development cycle. It then provides an overview of JMeter, an open source performance testing tool, including what it is, who can use it, where and when it can be used, why it should be used, and how to use it. The document also briefly discusses distributed testing, integration with continuous integration tools, and alternatives to JMeter.