Mac版で0.282secのコード。http://gigazine.net/news/20160208-working-clicker/

work_clicker.js

var names = [
  'shikaku',
  'affiliate',
  'kabu',
  'tochi',
  'programming'
];
function main() {
  var i;
  var currentJob = 1;
  var workCount = 40;/* Record 0.282s when '40' */
  start();
  for (;;) {
    for (i = 0;i < workCount;i++) {
      work();
    }
    if (cash > getPrice(currentJob)) {
      purchase(currentJob);
      currentJob = updateJob(currentJob);
    }
    if (cash > 100000000) {
      print("Finish!");
      break;
    }
  }
}
function getPrice(index) {
  var name = names[index];
  // print(index + "," + names[index] + "," + name + "," + prices[name]);
  return prices[name];
}
function updateJob(current) {
  var minPrice = prices[0];
  var minJob = 0;
  for (var i=1;i<=3;i++) {
    if (minPrice > prices[i]) {
      minPrice = prices[names[i]];
      minJob = i;
    }
  }
  return minJob;
}

main();