ember-cli-build.js

// append at end of ember-cli-build.js
(() => {
  const Instrumentation = require("ember-cli/lib/models/instrumentation");
  let count = 0;

  const start = Instrumentation.prototype.start;
  Instrumentation.prototype.start = function hookedStart(...args) {
    count++;
    console.profile(args[0] + count);
    return Reflect.apply(start, this, args);
  };

  const stopAndReport = Instrumentation.prototype.stopAndReport;
  Instrumentation.prototype.stopAndReport = function hookedStopAndStart(...args) {
    console.profileEnd(args[0] + count);
    return Reflect.apply(stopAndReport, this, args);
  };
})();

start.md

run node --inspect-brk ./node_modules/.bin/ember serve

open chrome://inspect/ in Chrome

click inspect node under Remote Target

unpause break in Sources tab

open Profiler tab and wait for profile to show up

make changes, and wait for next profile to show up