Benchmark and find out. Or use the self-loading alternative. Or split the initialisation from the actual use. 
require Text::Unidecode if $asciify;

while ($line = <F>) {
  chomp($line);
  $line = Text::Unidecode::unidecode($line) if $asciify;
  ...
}

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In reply to Re^7: Use module only if it is in use by ikegami
in thread Use a module only if it is in use by vitoco

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