1. Functional testing conducted to evaluate the compliance of a system or component with specified performance requirements.

Although performance testing is described as a part of system testing, it can be regarded as a distinct level of testing. Performance testing verifies loads, volumes and response times, as defined by requirements.

2.Performance testing verifies loads, volumes, and response times, as defined by requirements. Although performance testing is a part of system testing, it can be regarded as a distinct level of testing.