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use 5.20.0;
use warnings;
...
    $row[$_] =~ tr{,}{-} for grep { $csv->is_quoted ($_) } 0..$#row;
    $csv->say ($oh, \@row);
    }

$ time perl test.pl
20.120u 0.156s 0:20.48 98.9%    0+0k 13888+214656io 0pf+0w

use 5.20.0;
use warnings;
...
    $row[1] =~ tr{,}{-};
    $csv->print ($oh, \@row);
    }

$ time perl test2.pl
5.564u 0.144s 0:05.90 96.6%     0+0k 16+214656io 0pf+0w