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use Benchmark 'cmpthese';
my $str = "this is the best end";
cmpthese(-5, {
...
         Rate extra plain
extra 12019/s    --  -76%
plain 49616/s  313%    --

use Benchmark 'cmpthese';
my $str = "this is the best end";
cmpthese(-5, {
...
extra 11712/s    --  -35%  -76%
uroll 17986/s   54%    --  -64%
plain 49329/s  321%  174%    --