Swifter

Swifter is a Python package designed to significantly speed up `apply` operations on pandas DataFrames and Series. It achieves this by automatically determining the fastest available method for applying a function, leveraging vectorized pandas operations, Dask for parallel processing, or multi-threading/multi-processing. Swifter integrates directly into pandas objects, offering a seamless way to optimize user-defined functions without extensive code changes. The current version is 1.4.0, released in July 2023, and the project maintains an active development and release cadence.