issue_comments: 296111630

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https://github.com/pydata/xarray/issues/1379#issuecomment-296111630 https://api.github.com/repos/pydata/xarray/issues/1379 296111630 MDEyOklzc3VlQ29tbWVudDI5NjExMTYzMA== 1217238 2017-04-21T07:42:45Z 2017-04-21T07:42:45Z MEMBER

Alignment and broadcasting means that xarray.concat is inherently going to be slower than np.concatenate. But little effort has gone into optimizing it, so it is quite likely that performance could be improved with some effort.

My guess is that some combination of automatic alignment and/or broadcasting in concat is causing the issue with exploding memory usage here. See https://github.com/pydata/xarray/issues/1354 for related discussion -- contributions would certainly be welcome here.

 
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