On a server running heterogeneous CPU-bound tasks of various users it is hardly a realistic expectation, but on a single-user device with a single application i

On a server running heterogeneous CPU-bound tasks of various users it is hardly a realistic expectation, but on a single-user device with a single application in the foreground I would say it is realistic, since most of these running processes are blocked on something most of the time. Hundreds of mostly-idle resident processes are insignificant to a one that puts the CPU through its paces.