Need to improve plot generation performance about adf HOT 2 OPEN

For the polar plots, would it be worth looking into gdal or ncremap or other command line language to re-project the data before it gets to the plots? It seems we lose some time when re-projecting as the polar plots are being made in python.

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Do we have data to support the idea that plot generation is slower than NCL? I don't have a good feeling for what makes plotting fast or not. For contours and transforms, there could be actual algorithmic differences. I'm not sure if GDAL would save us from any of those calculations (I don't really understand GDAL). If all the time is being spent rendering (as opposed to calculating), I wonder whether there is a backend issue that could be customized to be faster (could be architecture dependent?)?

A couple things, just to remember to check:

• https://matplotlib.org/stable/users/explain/performance.html
• https://scitools.org.uk/cartopy/docs/latest/ notes we might try PYPROJ_GLOBAL_CONTEXT=ON

Also, if we really get into this, we can explore non-Matplotlib options (e.g., plotly), but I'm not sure whether the mapping capabilities are as good.

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