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use Benchmark;
Benchmark::cmpthese(shift, {
...
        $b[$j] .= "b" for 1 .. 10000;
    },
});

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Benchmark: running a, b for at least 1 CPU seconds...
         a:  1 wallclock secs ( 1.03 usr +  0.01 sys =  1.04 CPU) @ 12
+4.04/s (n=129)
...
   Rate    a    b
a 124/s   -- -35%
b 192/s  55%   --