issue_comments: 326867685

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https://github.com/pydata/xarray/issues/1521#issuecomment-326867685 https://api.github.com/repos/pydata/xarray/issues/1521 326867685 MDEyOklzc3VlQ29tbWVudDMyNjg2NzY4NQ== 1217238 2017-09-04T05:13:59Z 2017-09-04T05:20:50Z MEMBER

The problem is these lines in combine.py: https://github.com/pydata/xarray/blob/78ca20a6ea1a42eb637ae2ef09189f481cfda9a2/xarray/core/combine.py#L158-L168

We inspect compare coordinates for equality in order to decide whether to ignore redundant coordinates or stack them up. This happens if coords='different'. That is the default choice, which was convenient before we supported dask, but is now a source of performance trouble as you point out.

 
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