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doc/source/whatsnew/v0.23.0.txt

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@@ -666,6 +666,7 @@ Performance Improvements
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- Improved performance of pairwise ``.rolling()`` and ``.expanding()`` with ``.cov()`` and ``.corr()`` operations (:issue:`17917`)
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- Improved performance of :func:`DataFrameGroupBy.rank` (:issue:`15779`)
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- Improved performance of variable ``.rolling()`` on ``.min()`` and ``.max()`` (:issue:`19521`)
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- Improved performance of :func:`GroupBy.ffill` and :func:`GroupBy.bfill` (:issue:`11296`)
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.. _whatsnew_0230.docs:
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