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I am using the async LaTeX preview branch and org-persist-write-all
takes a lot of time to finish executing due to the use of pp when saving
the index file.  Changing org-persist-write:index to not pass a non-nil
PP argument to org-persist--write-elisp-file changes the execution time
of org-persist-write-all from 62 secs to just 8 secs.  For reference,

    (length org-persist--index) ;; ⇒ 1504

I have attached the profiler report for org-persist--index of much
smaller length but if required I can reproduce a report for the full one
too.

Please let me know if more information is required from my side.  Thank
you.