issue_comments: 706640151

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https://github.com/pydata/xarray/issues/4498#issuecomment-706640151 https://api.github.com/repos/pydata/xarray/issues/4498 706640151 MDEyOklzc3VlQ29tbWVudDcwNjY0MDE1MQ== 1217238 2020-10-11T02:32:25Z 2020-10-11T02:32:36Z MEMBER

resample uses the same machinery in xarray as other grouped aggregations.

Right now, grouped aggregations are very slow when there are many groups (like in resample) because we use a Python loop over groups.

Probably the most obvious way to speed this up would be to wrap the "numpy-groupies" package in xarray: https://github.com/pydata/xarray/issues/4473

 
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