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html_url issue_url id node_id user created_at updated_at author_association body reactions performed_via_github_app issue
https://github.com/pydata/xarray/issues/2004#issuecomment-375020977 https://api.github.com/repos/pydata/xarray/issues/2004 375020977 MDEyOklzc3VlQ29tbWVudDM3NTAyMDk3Nw== 1217238 2018-03-21T17:08:15Z 2018-03-21T17:08:15Z MEMBER

The culprit appears to be netCDF4-python and/or netCDF-C: ``` f = netCDF4.Dataset('test.nc')

%time f['xarray_dataarray_variable'][:, ::10]

CPU times: user 313 ms, sys: 1.23 s, total: 1.54 s

```

When I try doing the same operation with h5netcdf, it runs very quickly: ```python reopened = xr.open_dataarray('test.nc', engine='h5netcdf')

%time reopened[::1, ::10].compute()

CPU times: user 6.11 ms, sys: 3.63 ms, total: 9.74 ms

```

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