[Gmsh] GMSH parsing is very slow

[Al Sc]

Dear Sir or Madam,

some gmsh-file of mine (roughly 100000 lines) takes extremely much time to
load: Just the parsing of gmsh (in both version 3.x.x and 4.x.x) takes
about 45 minutes to 1 hour.
However, in contrast, the parsing of the resulting mesh, which is of
similar complexity, takes only some seconds. Since I must mesh many
variants of this structure, that issue is really critical for me.
Are there some general recommendations on how to improve the startup time
of gmsh?

Best regards

A. S.
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