Comment (by Roland Haas):

@Steven R. Brandt will you have time to look into this before the next release? It makes the CST stage quite a bit slower. For the non-rdwr.pl parts the slowness was deemed bad enough that the parsed syntax tree is beeing cached in between CST runs.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2374/rdwrpl-re-parses-ccl-files