Chapter 8: Couldn't see the performance difference in Department List ViewController Tests

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Hi, I just test the DepartmentListViewControllerTests in simulator, iPhone7Plus, iPhone6s, iPhone5s, and the time difference between testTotalEmployeesPerDepartment() and testTotalEmployeesPerDepartmentFast() is really small, wonder why this happen?

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@duckmole Have you also tested the chapter’s sample project?

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Yes, I tested the final project with simulator and iPhone7Plus.

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The tests run pretty fast. You would need a bigger data set, not just 50 employees in 6 departments, to really notice the difference. Try 5000 employees and 60 departments and it would probably be pretty obvious.

This was on the XR simulator:

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