Learn in the textbookTest Techniques and Integration/Performance Verification
DefinitionPerformance testing (性能テスト) measures, with figures such as response time (応答時間) and throughput (スループット: the number of items handled in a set time), whether the system can process work at the required speed and volume.
ExplanationHow fast and how much the system can process is one of the non-functional requirements (非機能要件), the conditions other than functions, such as performance and reliability, and this test checks whether their target values are met. Because the measured values depend on the equipment, the test runs in an environment whose hardware and software are close to production. It only means something for the whole system once the components are connected, so developers carry it out mainly at the system testing (システムテスト) stage.
AnalogyIt is like timing a store's new checkout register with a stopwatch: how many seconds one customer's payment takes, and how many customers it can serve in an hour.