webPerfMeasure.js

// https://hackernoon.com/measuring-web-performance-its-really-quite-simple-adeda8f7f39e

function logTimes(message) {
  performance.mark(message); // this one is for WebPageTest
  console.timeStamp(message); // this is for the Performance tab in Chrome DevTools
  console.info(message, performance.now()); // this is for the console, duh

  // this here is for Google Analytics
  ga('send', {
    hitType: 'timing',
    timingCategory: 'Performance',
    timingVar: message,
    timingValue: performance.now(),
  });
}

// use it like so
bindAllMyEventsOrWhateverGetsThePageReady();

logTimes('The page is really ready');