If I was to use Parse::RecDescent, would it go faster? Maybe.
(is Parse::RecDescent all in perl?) Yes, but that may be irrelevant.
Before proceeding, you may want to try figuring out exactly where your file parsing script is spending its time. Packages like Devel::Timer and Devel::Profiler can help with that. The thing is that you may be surprised by the results -- the slow part may not be your parsing logic, but something else.
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