Yes
The whole thing was done in a couple hours, with just a few back-and-forths
stickfigure on Hacker News
optimized a hot path in some Java code from ~350ms to ~60ms
In the thread “There's no reason for software to be slow anymore”, replying to this comment
Helped: LLM chose profiling tools and built JMH harness; simple prompt sufficed.
… About half of the optimizations were things that I would have figured out on my own; the other half were definitely "wow" moments. The whole thing was done in a couple hours, with just a few back-and-forths. Sans AI, it would have taken a week, with nowhere near the same gain. …