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Copy file name to clipboardExpand all lines: doc/source/whatsnew/v3.0.0.rst
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@@ -592,6 +592,7 @@ Performance improvements
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- Performance improvement in :meth:`RangeIndex.take` returning a :class:`RangeIndex` instead of a :class:`Index` when possible. (:issue:`57445`, :issue:`57752`)
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- Performance improvement in :func:`merge` if hash-join can be used (:issue:`57970`)
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- Performance improvement in :meth:`CategoricalDtype.update_dtype` when ``dtype`` is a :class:`CategoricalDtype` with non ``None`` categories and ordered (:issue:`59647`)
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- Performance improvement in :meth:`DataFrame.astype` when converting to extension floating dtypes, e.g. "Float64" (:issue:`60066`)
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- Performance improvement in :meth:`to_hdf` avoid unnecessary reopenings of the HDF5 file to speedup data addition to files with a very large number of groups . (:issue:`58248`)
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- Performance improvement in ``DataFrameGroupBy.__len__`` and ``SeriesGroupBy.__len__`` (:issue:`57595`)
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- Performance improvement in indexing operations for string dtypes (:issue:`56997`)
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