Do you have any studies in the last 6 months showing performance decreases?

March 2026:

https://www.faros.ai/blog/ai-acceleration-whiplash-takeaways

Faros would tell you shops are shipping 16% more PRs with heavy AI use.

https://unessays.substack.com/p/talk-is-cheap

I think that's wrong because it doesn't adequately account for the quality and rework their data show.