In this episode, Bob sits down with Arthur, a Python engineer based in France and the creator of CodSpeed, to dig into a problem many teams don’t notice until it’s too late: performance regressions. Arthur shares the story behind building CodSpeed, starting with real-world pain points from robotics and machine-learning pipelines where small slowdowns quietly piled up and broke systems in production. 

We discuss how CodSpeed fits into everyday developer workflows and why treating performance checks like tests or coverage changes how teams ship code. Arthur also shares how open source shaped the product’s mission, the surprising environmental impact of avoiding tiny regressions at scale, and why AI-driven coding makes performance guardrails more important than ever.

Reach out to Arthur on LinkedIn: https://www.linkedin.com/in/arthurpastel/ 

Arthur's website: https://apas.tel/

Check out Codspeed: https://codspeed.io/ 

Github: https://github.com/CodSpeedHQ/codspeed

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