While this won't be faster, you can replace the entire loop with the following one-liner: 
"_${_}_" =~ /(.{1,5})(?{$$ngram {$^N} ++})(?!)/ for @large_wordlist;

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Abigail

In reply to Re: Fasten up NGram generation code? by Abigail-II
in thread Fasten up NGram generation code? by PetaMem

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