JSFiddle - React, Tailwind, and code Playground

HTML

<div>Correct order run took <span id='o'></span> msec.</div>
<div>Incorrect order run took <span id='no'></span> msec.</div>

CSS

body { background-color: #247; }
div { color: #fff; }

JavaScript

const size = 5000;
const measure = function(id, func) {
	const t0 = performance.now();
  func();
  const t1 = performance.now();
  document.getElementById(id).innerText = Math.floor(t1 - t0);
};
const matrix = [];
for(i = 0; i < size; i++) {
  matrix[i] = [];
  for(j = 0; j < size; j++) {
    matrix[i][j] = 1;
  }
};


measure("o", function() { 
  for(i = 0; i < size; i++) {
    for(j = 0; j < size; j++) {
      matrix[i][j] = matrix[i][j] * 2;
    }
  }
});
measure("no", function() { 
  for(i = 0; i < size; i++) {
    for(j = 0; j < size; j++) {
      matrix[j][i] = matrix[j][i] * 2;
    }
  }
});