PERF: pandas.core.sorting.compress_group_index for already sorted values #53806
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doc/source/whatsnew/v2.1.0.rst
file if fixing a bug or adding a new feature.This improves performance for a number of
MultiIndex
/multi-column operations (e.g. sorting, groupby, unstack) where the index/column values are already sorted.Checked a few existing ASVs: