In case of normal Perl IO, i.e, <FH>, every character is looked at twice -- first by Perl to figure out where each line ends, then by the code itself to split everything into separate fields. That's why you're seeing a ~50% increase in performance.
I disagree. The "looking at each character" is relatively cheap. Making a new string out of each line, however, is more expensive. The sysread() approach places less load on Perl's memory management.
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