The most exciting thing for me is it has changed the cost structure of studying code for refinement.

I’d never done half as much code profiling & experimenting before. Now that generating one-shot code is cheap, I can send the agent off on a mission to find slow code and attempt to speed it up. This way, only once it has shown speedup is there and reasonably attainable do I need to think about how to speed the code up “properly”. The expected value was too low when the experimenting was expensive.