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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-375010010 https://api.github.com/repos/pydata/xarray/issues/2004 375010010 MDEyOklzc3VlQ29tbWVudDM3NTAxMDAxMA== 1217238 2018-03-21T16:38:59Z 2018-03-21T16:38:59Z MEMBER

Here's a simpler case that gets at the essence of the problem: ```python import xarray as xr import numpy as np

source = xr.DataArray(np.zeros((100, 12000)), dims=['time', 'x']) source.to_netcdf('test.nc', format='NETCDF4') reopened = xr.open_dataarray('test.nc')

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

CPU times: user 1.35 ms, sys: 6.77 ms, total: 8.12 ms

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

CPU times: user 371 ms, sys: 1.33 s, total: 1.7 s

```

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