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Actionable Techniques for Finding Performance Regressions

2025-09-25 · PyData Amsterdam 2025

talk

by Thijs Nieuwdorp (VodafoneZiggo) , Dr. Jeroen Janssens (Posit)

Bash Data Science Git Polars Python

Ever been burned by a mysterious slowdown in your data pipeline? In this session, we'll reveal how a stealthy performance regression in the Polars DataFrame library was hunted down and squashed. Using git bisect, Bash scripting, and uv, we automated commit compilation and benchmarking across two repos to pinpoint a commit that degraded multi-file Parquet loading. This led to challenging assumptions and rethinking performance monitoring for the Python data science library Polars.