This seems awfully contrived.
Issue 1: It's very difficult to tell if your contribution got 50% improvement in performance because there were 10 other devs pushing in features and bug fixes. This is the attribution problem
Issue 2: This happens over time. It's very unlikely that your 50% improvement happens every year or month. Because, think for your self, this is compounding with large rates. It grows quickly. 1.5x improvement in 6 cycles (months or years) is 10x. This essentially is the time problem
Issue 3: even if you deliver the results you did, in a large company there's a large bureaucracy and no one person has the ability to increase your salary by that much. This is the control problem.
