User script benchmark for GM_getValue() and GM_setValue().

gistfile1.txt

// ==UserScript==
// @name        Benchmark: getValue/setValue
// @namespace   test
// @include     http*
// @version     1
// @grant       GM_getValue
// @grant       GM_setValue
// ==/UserScript==

var iters = 40;

if (window === top) {
  console.log('Starting set benchmark ...');
  var start = new Date().valueOf();
  for (var i = 0; i < iters;) {
    GM_setValue('i', i++); GM_setValue('i', i++);
    GM_setValue('i', i++); GM_setValue('i', i++);
    GM_setValue('i', i++); GM_setValue('i', i++);
    GM_setValue('i', i++); GM_setValue('i', i++);
    GM_setValue('i', i++); GM_setValue('i', i++);
  }
  var end = new Date().valueOf();
  console.log(i, 'set calls took', (end - start));
    
  console.log('Starting get benchmark ...');
  var start = new Date().valueOf();
  for (var i = 0; i < iters; i+=10) {
    GM_getValue('i'); GM_getValue('i');
    GM_getValue('i'); GM_getValue('i');
    GM_getValue('i'); GM_getValue('i');
    GM_getValue('i'); GM_getValue('i');
    GM_getValue('i'); GM_getValue('i');
  }
  var end = new Date().valueOf();
  console.log(i, 'get calls took', (end - start));
    
  console.log('Starting get/set benchmark ...');
  var start = new Date().valueOf();
  for (var i = 0; i < iters; ) {
    GM_getValue('i'); GM_setValue('i', i++);
    GM_getValue('i'); GM_setValue('i', i++);
    GM_getValue('i'); GM_setValue('i', i++);
    GM_getValue('i'); GM_setValue('i', i++);
    GM_getValue('i'); GM_setValue('i', i++);
    GM_getValue('i'); GM_setValue('i', i++);
    GM_getValue('i'); GM_setValue('i', i++);
    GM_getValue('i'); GM_setValue('i', i++);
    GM_getValue('i'); GM_setValue('i', i++);
    GM_getValue('i'); GM_setValue('i', i++);
  }
  var end = new Date().valueOf();
  console.log(i, 'get/set calls took', (end - start));
}

Hello Sir, I copied this code in a Greasemonkey script. Can you please tell me how to see the result of this script. I'm not getting any result on loading the web-page.