promiseラップするとどれくらい遅くなるか

exec.md

$ node -v
v12.12.0

$ node promise.js
pure: 4.863ms
promise: 47.649ms

promise.js

const len = 10000

function pure() {
  console.time('pure')
  const get = () => {
    return { foo: 'bar' }
  }
  for (let i = 0; i < len; i++) {
    get()
  }
  console.timeEnd('pure')
}

async function promise() {
  console.time('promise')
  const get = () => {
    return Promise.resolve({ foo: 'bar' })
  }
  for (let i = 0; i < len; i++) {
    await get()
  }
  console.timeEnd('promise')
}

async function main() {
  pure()
  await promise()
}

main().catch(e => {
  console.error(e)
})