issue_comments: 916837170

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https://github.com/pydata/xarray/pull/5640#issuecomment-916837170 https://api.github.com/repos/pydata/xarray/issues/5640 916837170 IC_kwDOAMm_X842pdMy 3801015 2021-09-10T11:36:35Z 2021-09-10T11:36:35Z CONTRIBUTOR

@spencerkclark

RE perfomance.

Its only a performance issue to attempt to import cftime repeatedly. Having it fail once in the top level import is not a big problem. The issue comes when it does it thousands of times every time you try and .sel or .isel, which then adds up to a huge performance hit. Given xarray takes a while to import anyway, the marginal cost of search ing the full pythonpath 3 times in import is minimal - only an issue when done repeatedly.

I've fixed this for some other cases I've found that were causing me slowness - would like me to changeanythinng else before this can be merged?

 
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