Performance testing (PT) is not to be construed as features testing even though it has a definite link with the latter. In fact, PT begins from where the feature testing ends. It presupposes successful completion of features testing, meaning that all the desired functional requirements expected from the system are fully met. However, it is worth noting that conducting PT without features testing is often fraught with great difficulties. This is because the residual defects in the system, which otherwise would have been known in features testing, would give misleading results about the performance. Previous chapters emphasized the need for PT and various factors that have impact the performance of Web-based applications. This chapter provides an insight about the technology aspects, including the software languages, necessary for Web development. Needless to add, that technology as well as software languages have a critical impact on the performance of the system.