Penalty of unnecessary async / await

penalty.js

async function addAwait (a, b) {
  const resolved = await a
  return a + b
}

function addOptimised (a, b) {
  if (a instanceof Promise) {
    return a.then(resolved => resolved + b)
  } else {
    return a + b
  }  
}

async function timeAwaited () {
  const start = Date.now()
  let val = 1
  for (let i = 0; i < 999999; i++) {
    val = addAwait(val, 1)
  }
  await val
  const end = Date.now()
  console.log('time awaited fn - ', end - start)
}

async function timeOptimised () {
  const start = Date.now()
  let val = 1
  for (let i = 0; i < 999999; i++) {
    val = addOptimised(val, 1)
  }
  await val
  const end = Date.now()
  console.log('time optimised fn -', end - start)
}

async function main() {
  timeOptimised()
  console.log('--------')
  await timeAwaited()
}

main()