JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/benchmark/1.0.0/benchmark.min.js"></script>
See the developer console for results!

JavaScript

function s() {
  return 1;
}
function ordinary_loop() {
  var count = 0;
  for (var i = 0; i < 10; i++) {
    count += s();
  }
}

function unrolled_loop() {
  var count = 0;
  count += s();
  count += s();
  count += s();
  count += s();
  count += s();
  count += s();
  count += s();
  count += s();
  count += s();
  count += s();
}

// Run benchmark:
var suite = new Benchmark.Suite;
suite
.add('ordinary loop', ordinary_loop)
.add('unrolled loop', unrolled_loop)
.on('cycle', function(event) {
  console.log(event.target.toString());
})
.on('complete', function() {
  console.log('Fastest is ' + this.filter('fastest').pluck('name'));
})
.run({'async': false});