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
930925407,MDExOlB1bGxSZXF1ZXN0Njc4NTEyNTU5,5541,Faster transpose,14371165,closed,0,,,4,2021-06-27T13:00:21Z,2021-06-27T19:58:14Z,2021-06-27T19:29:58Z,MEMBER,,0,pydata/xarray/pulls/5541,"Make the transpose faster.
* `get_axis_num` seems slow, avoid triggering it unnecessarily for example when using 1d arrays.
* .copy(deep=False) is the bottleneck for 1d arrays. Not sure if it can be dealt with though.



<!-- Feel free to remove check-list items aren't relevant to your change -->

- [ ] Closes #xxxx
- [ ] Tests added
- [ ] Passes `pre-commit run --all-files`
- [ ] User visible changes (including notable bug fixes) are documented in `whats-new.rst`
- [ ] New functions/methods are listed in `api.rst`
","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/5541/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull