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https://github.com/pydata/xarray/issues/657#issuecomment-156858837 https://api.github.com/repos/pydata/xarray/issues/657 156858837 MDEyOklzc3VlQ29tbWVudDE1Njg1ODgzNw== 1217238 2015-11-15T21:53:30Z 2015-11-15T21:53:30Z MEMBER

Yes, the difference in speed is definitely due to cartopy, which handles the projections. @pelson may be able to clarify whether imshow is always slower than pcolormesh when using cartopy, or if that is specific to particular projections.

We changed the default from imshow to pcolormesh in #608. I would not be opposed to changing the default back, given that we already product essentially equivalent plots with both methods. We did add a performance note to our (currently broken) docs: http://xray.readthedocs.org/en/latest/plotting.html#two-dimensions

@jhamman and/or @clarkfitzg may have some opinions here.

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