So, not only AI assistant are making you 19% slower on non bullshit tasks, they also make you believe that you are 20% faster.
From what looks like a serious study (with a small set of 16 people, but the set-up seems good):
"Measuring the Impact of Early-2025 AI on Experienced Open-Source Developer Productivity"
GenAI is a master bullshiter, the kind raising cults
we find that when developers use AI tools, they take 19% longer than without—AI makes them slower
This gap between perception and reality is striking: developers expected AI to speed them up by 24%, and even after experiencing the slowdown, they still believed AI had sped them up by 20%.
