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our @array = (0..1000000);

...
  'Step 2' => 'step2(500000, @::array)',
  'Step 3' => 'step3(500000, @::array)'
});

Benchmark: running Step 1, Step 2, Step 3 for at least 10 CPU seconds.
+..
  Step 1: 10 wallclock secs (10.17 usr +  0.00 sys = 10.17 CPU) @  5.1
+1/s (n=52)
  Step 2: 10 wallclock secs (10.00 usr +  0.00 sys = 10.00 CPU) @  5.1
+0/s (n=51)
  Step 3: 11 wallclock secs (10.72 usr +  0.00 sys = 10.72 CPU) @  0.4
+7/s (n=5)