async.js

async function asyncFoo(i) {
  return Promise.resolve(i);
}

async function main() {
  console.log(`Start`);
  const start = Date.now()

  let total = 0
  for (let i = 0;i < 550000; i++) {
    total += await asyncFoo(i);
  }
  const end = Date.now()
  console.log(`Total: ${ total }`)
  console.log(`Time Taken: ${ end - start }`)
}

main();