Project completion rate vs previous abandonment rate. But mostly time to implement a task vs before.

I used to spent my days writing unit tests. Integration tests. Functional tests. Now I synth the unit tests and adjust I/O to define desired implementation. It’s very effective.

I will say it’s a subjective measure that’s not really general or transferable. Most folks will have marginal gains. I “feel” about 10x more effective, but I’m sure others would disagree.