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AI coders think they’re 20% faster — but they’re actually 19% slower
(pivot-to-ai.com)
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this post was submitted on 12 Jul 2025
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Programming
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Reading the paper, AI did a lot better than I would expect. It showed experienced devs working on a familiar code base got 19% slower. It's telling that they thought they had been more productive, but the result was not that bad tbh.
I wish we had similar research for experienced devs on unfamiliar code bases, or for inexperienced devs, but those would probably be much harder to measure.
1% slowdown is pretty bad. You'd still do better just not using it. 19% is huge!