Comment (by Gabriele Bozzola):

If I did reach a final conclusion, I forgot about it. I see I have a commit about it: https://bitbucket.org/Sbozzolo/einsteinanalysis/commits/69b64606b6a1ac35405a2361b84fef4a2ca87a1b

I think I claim that this is (marginally) faster in production runs.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2626/multipole-is-not-openmp-parallelized