Why need to pay more time when access the array at first time?

Yes, I run the code in WSL and get the results above.
While it’s so different when I run it in windows REPL, the results is

  0.069340 seconds
  0.047052 seconds
  0.046383 seconds

  0.069447 seconds
  0.046711 seconds
  0.047232 seconds

  0.069558 seconds
  0.049158 seconds
  0.047343 seconds

  0.070144 seconds
  0.046805 seconds
  0.046005 seconds

  0.070537 seconds
  0.047274 seconds
  0.046166 seconds

  0.069857 seconds
  0.046681 seconds
  0.046450 seconds