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Line-at-a-time, default layers
  100.0 MB in 12.012 sec, 8.3 MB/sec
...

Slurp into scalar with sysopen/sysread (single read)
  100.0 MB in 0.034 sec, 2976.2 MB/sec

#!/usr/bin/perl
use strict;
...
    my $secs = $end_time - $start_time;
    return ($secs, $size);
}