text: var graph = require('ngraph.generators').grid(20, 20);
  
  var Benchmark = require('benchmark');
  var suite = new Benchmark.Suite;
  
  // add tests
  suite.add('Run default', function() {
    var layout = require('../')(graph);
    for (var i = 0; i < 20; ++i) {
      layout.step();
    }
  })
  .on('cycle', function(event) {
    console.log(String(event.target));
  })
  .on('complete', function() {
    console.log('Fastest is ' + this.filter('fastest').pluck('name'));
  })
  // run async
  .run({ 'async': true });
  