We can test an entire system for performance; manually by constructing an environment where many users work simultaneously on the system. But it has a lot of limitations.
Manual Performance Testing Limitations:-
➤ it is expensive, requiring large amounts of both personnel and machinery
➤ it is complicated, especially coordinating and synchronizing multiple testers
➤ it involves a high degree of organization, especially to record and analyze
➤ the repeatability of the manual tests is limited