issue_comments: 285052725

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https://github.com/pydata/xarray/issues/1301#issuecomment-285052725 https://api.github.com/repos/pydata/xarray/issues/1301 285052725 MDEyOklzc3VlQ29tbWVudDI4NTA1MjcyNQ== 743508 2017-03-08T14:20:30Z 2017-03-08T14:20:30Z CONTRIBUTOR

My 2cents - I've found that with big files any %prun tends to show method 'acquire' of '_thread.lock' as one of the highest time but it's not necessarily indicative of where the perf issue comes from because it's effectively just waiting for IO which is always slow. One thing that helps get a better profile is setting dask backend to the non-parallel sync option which gives cleaner profiles. 

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