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use Benchmark 'cmpthese';

...
shift  435374/s     --   -14%
assign 505471/s    16%     --

for (1..100) { ++$x; $x+=$y+=$z }

Benchmark: running assign, shift, each for at least 1 CPU seconds...
...
         Rate assign  shift
assign 7588/s     --    -0%
shift  7592/s     0%     --