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            Serial    threads  MCE::Hobo  MCE::Loop  MCE::Child

...
   threads is slow on Cygwin, so stopped due to taking too long.
   My FreeBSD has an older Thread::Queue missing the ->end method.

use strict;
use warnings;
...
printf "duration: %0.03f seconds\n", time - $start;
print scalar(keys %result), "\n"; # 16900

use strict;
use warnings;
...
    $done->enqueue(0,0);
}

use strict;
use warnings;
...
    $done->enqueue(0,0);
}

use strict;
use warnings;
...
printf "duration: %0.03f seconds\n", time - $start;
print scalar(keys %result), "\n"; # 16900

use strict;
use warnings;
...
    return \%result;
}