test-setImmediate-performance-browser.js

var i = 2e5, start = new Date();
void setImmediate(function next(i) {
  if (i > 0)
    setImmediate(next, i - 1);
  else
    console.log((new Date() - start) / 1000);
}, i);

test-setImmediate-performance.js

global.setImmediate = null;
require('./setImmediate');

var i = 3e6;
setImmediate(function next(i) {
  if (i > 0)
    setImmediate(next, i - 1);
}, i);