gm-2346-test.user.js

// ==UserScript==
// @name        GM_getResourceText Test
// @namespace   https://github.com/arantius
// @include     *
// @version     2
// @grant       GM_getResourceText
// @resource    t https://github.com/greasemonkey/greasemonkey/issues/2346
// @require     http://cdnjs.cloudflare.com/ajax/libs/mathjs/2.7.0/math.min.js
// ==/UserScript==

var NUM = 250;
console.log('Running GM_getResourceText test; NUM =', NUM);
performance.setResourceTimingBufferSize(NUM + 25);


performance.mark('absoluteStart');
for (var i = 1; i <= NUM; i++) {
  performance.mark('sampleStart');
  GM_getResourceText('t');
  performance.mark('sampleEnd');
  performance.measure('sample', 'sampleStart', 'sampleEnd');
  performance.clearMarks('sampleStart');
  performance.clearMarks('sampleEnd');

}
performance.mark('absoluteEnd');
performance.measure('absolute', 'absoluteStart', 'absoluteEnd');


var absoluteMeasure = performance.getEntriesByName('absolute')[0];
var samples = [];
for (var i = 0, es = performance.getEntriesByName('sample'); e = es[i]; i++) {
  samples.push(e.duration);
}
console.log('Over', NUM, 'samples', absoluteMeasure.duration, 'total time.');
console.log(
    'min =', math.min(samples),
    'max =', math.max(samples),
    'mean =', math.mean(samples),
    'median =', math.median(samples),
    'std =', math.std(samples)
    );