issue_comments: 1350738301

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https://github.com/pydata/xarray/issues/7376#issuecomment-1350738301 https://api.github.com/repos/pydata/xarray/issues/7376 1350738301 IC_kwDOAMm_X85QgqF9 4160723 2022-12-14T09:40:57Z 2022-12-14T09:40:57Z MEMBER

Thanks for the report @ravwojdyla.

Since #5692, multi-indexes level have each their own coordinate variable so copying takes a bit more time as we need to create more variables. Not sure what's happening with _maybe_cast_to_cftimeindex, though.

The real issue here, however, is the same than in #6836. In your example, .groupby("i1") creates 400 000 groups whereas it should create only 4 groups.

 
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