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My “early-ish” adopter experience with Python 3.14 is…a mixture of profound disappointment and frustration. Lots of stuff is just *broken* with little to no actionable solution.

Ada Lündhé

@adalundhe.dev

The annotation changes break non-Pydantic libraries like msgspec, sub interpreters are cool in theory but have massive incompatibility issues with everything from numpy to Pydantic, there’s notable and unexplained 10-20% performance drops across the board.

11/10/25, 1:13 am0 reposts2 likes

Ada Lündhé

@adalundhe.dev

11 Oct 2025

This feels very, *very* undercooked. New Python version have always had some teething issues, but this is the first time that a release just feels outright unusable and broken. It’s disappointing to say the least.