Hannah Walsh

Data engineer making sure the pipelines feeding the models don't silently break at 3am. Big fan of dbt and bigger fan of testing.

Articles by Hannah Walsh

Tutorials May 31, 2026

Polars vs pandas in 2026: a real 14GB benchmark, not a toy CSV

Every Polars-vs-pandas comparison I've read in the last year uses a 500MB CSV and announces that Polars is faster. I wanted to know what happens on the workload I actually run at work.

Hannah Walsh 4 min read