Software performance testing helps prevent performance problems by detecting bottlenecks before a system deployment or upgrade. Performance testing software helps you test a broad range of applications, including Web 2.0, ERP/CRM, and legacy applications to helps identify and reduce performance bottlenecks and obtain an accurate picture of end-to-end system performance before going live, so you can verify that applications meet specified application performance testing requirements and avoid issues in production.
Application performance testing is the process of testing performed to determine how a software application performs in terms of responsiveness and stability under a particular workload. It can also serve to investigate, measure, validate or verify other quality attributes of the system, such as scalability, reliability and resource usage.
Software Performance testing is a subset of performance engineering, an emerging computer science practice which strives to build performance into the design and architecture of a system.