issue_comments: 334212532

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https://github.com/pydata/xarray/issues/659#issuecomment-334212532 https://api.github.com/repos/pydata/xarray/issues/659 334212532 MDEyOklzc3VlQ29tbWVudDMzNDIxMjUzMg== 25231875 2017-10-04T16:27:21Z 2017-10-04T16:27:21Z NONE

In case anyone gets here by Googling something like "xarray groupby slow" and you loaded data from a netCDF file, be aware that slowness you see in groupby aggregation on a Dataset or DataArray may actually be due not to this issue but to the lazy loading that's done by default. This can be fixed by calling .load() on the Dataset or DataArray. See the Tip about lazy loading at http://xarray.pydata.org/en/stable/io.html#netcdf. 

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