issue_comments: 760114285

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https://github.com/pydata/xarray/issues/4804#issuecomment-760114285 https://api.github.com/repos/pydata/xarray/issues/4804 760114285 MDEyOklzc3VlQ29tbWVudDc2MDExNDI4NQ== 5700886 2021-01-14T10:44:19Z 2021-01-14T10:44:19Z CONTRIBUTOR

I'd also add that https://github.com/pydata/xarray/blob/master/xarray/core/computation.py#L1320_L1330 which is essentially python ((x - x.mean()) * (y - y.mean())).mean() is inferior to python (x * y).mean() - x.mean() * y.mean() because it leads to Dask holding all chunks of x in memory (see, e.g., https://github.com/dask/dask/issues/6674 for details).

 
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