id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
1490160140,PR_kwDOAMm_X85FGOVk,7374,Improve performance for backend datetime handling,14371165,closed,0,,,3,2022-12-11T16:01:05Z,2023-01-18T22:45:36Z,2023-01-13T14:50:53Z,MEMBER,,0,pydata/xarray/pulls/7374,"Was hunting some low-hanging performance fruits when reading in files.

* Use Variable(..., fastpath=True) for cases when a Variable has been unpacked and modified slightly.
* Don't check if variable is variable in decode_cf_variable
* Don't import DataArray until necessary in as_compatible_data.
* Add typing to touched files to make sure only Variables are used.

- [ ] Closes #xxxx
- [ ] Tests added
- [ ] User visible changes (including notable bug fixes) are documented in `whats-new.rst`
- [ ] New functions/methods are listed in `api.rst`
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