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From https://mailman.astron.com/pipermail/file/2022-March/000685.html:

rpm(1) and rpmlint(1) and probably other applications are using
libmagic to mass-determine the filetype
of files to process into a package. While looking at that, I noticed
that libmagic is quite slow when
it is processing large text-like files. This is because of many
complicated regexps being processed,
and the regexes are compiled repeatedly. regexp compilation is very
time consuming compared to regexp matching,
so it helps to do that only once and cache the result for further processing.

On a 64bit host this adds about 200kb of RAM usage, but it improves
matching speed by factor 2 - 4, which
is very noticeable when processing a larger directory of files.

follow-ups:
(0) https://mailman.astron.com/pipermail/file/2022-March/000685.html
(0) https://github.com/file/file/commit/4c8a4d8dbab1e73bfb30e391dcec49fcf269f84
    (0.1)  https://mailman.astron.com/pipermail/file/2022-March/000705.html
    (0.1) https://github.com/file/file/commit/7d438e28c16773e28a3707935c8e5d9927a515a7
    (0.2) https://mailman.astron.com/pipermail/file/2022-April/000718.html
    (0.2) https://github.com/file/file/commit/d1a00ae92b2cf09298615cf3aba474d8fec7380f
    (0.3) https://mailman.astron.com/pipermail/file/2022-April/000720.html
    (0.3) https://github.com/file/file/commit/4254a0afecfd2ae200c694dfcf93f4b4ac21652e

(1) https://mailman.astron.com/pipermail/file/2022-March/000688.html
(1) https://github.com/file/file/commit/a4b3abc4104d8a4eeb84a6242f2f1a830204a539
(2) https://mailman.astron.com/pipermail/file/2022-March/000693.html
(2) https://github.com/file/file/commit/d17d8e9ff8ad8e95fdf66239ccdcc2133d1ce5ce
(3) https://mailman.astron.com/pipermail/file/2022-March/000684.html
(3) https://github.com/file/file/commit/14b5d7aa0b55275969809fdf84e8a8caee857c0f

Version-Release number of selected component (if applicable):
file-5.39-8.el9

All this changes are already in fedora-37 from file-5.42-4.fc37

This Bugzilla was created to ensure backporting of these commits into RHEL-9.1.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (file bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:8406