issue_comments: 577737475

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https://github.com/pydata/xarray/pull/3545#issuecomment-577737475 https://api.github.com/repos/pydata/xarray/issues/3545 577737475 MDEyOklzc3VlQ29tbWVudDU3NzczNzQ3NQ== 2448579 2020-01-23T15:41:33Z 2020-01-23T15:41:33Z MEMBER

the most time consuming part is the expand_dims for every dataset, which accounts for roughly 80% overall concat runtime.

Hmmm... maybe we need a short-circuit version of expand_dims?

 
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