test.js

var async = require('async');
var fs    = require('fs');

console.time('timeout');
setTimeout(function() {
  console.timeEnd('timeout');
}, 500);

console.time('async.times');
async.times(100000, function(n, next) {
  fs.readFile(__filename, function() { next(); });
}, function() {
  console.timeEnd('async.times');
});