Crystal parser very slow on some calcs

While the new crystal parser performs well on most calculations, some are processed extremely slow. This example calc_id=g4uv0JfJhVDonAYjtYnb6Z1udzEs took over 2000s to process (the mainfile is only 200kb). This only happens on a few entries (~200 of 4000).

I remember @himanel1 complaining about slow runs on the dev cluster. Maybe that has the same cause.