Native Promises vs Generators vs Async/Await Performance vs Bluebird Promises

generators-vs-asyncawait-vs-native-promises.js

const Benchmark = require('benchmark')
const co = require('co')
const bluebird = require('bluebird')

const suite = new Benchmark.Suite

suite
  .add('co generators', {
    defer: true,
    fn: deferred => {
      co(function*() {
        yield Promise.resolve(1)
        yield Promise.resolve(2)
        deferred.resolve()
      })
    }
  })
  .add('async/await', {
    defer: true,
    fn: deferred => {
      (async () => {
        await Promise.resolve(1)
        await Promise.resolve(2)
        deferred.resolve()
      })()
    }
  })
  .add('native promises', {
    defer: true,
    fn: deferred => {
      Promise.resolve(1)
        .then(() => Promise.resolve(2))
        .then(() => deferred.resolve())
    }
  })
  .add('bluebird promises', {
    defer: true,
    fn: deferred => {
        bluebird.resolve(1)
          .then(() => bluebird.resolve(2))
          .then(() => deferred.resolve())
    }
  })
  .on('cycle', event => {
    const r = event.target

    dd(r)
  })
  .on('complete', () => {
    dd('Fastest is ' + suite.filter('fastest').map('name'))
  })
  .run({
    'async': false
  })

function dd(obj) {
    console.dir(obj, {colors: true})
}

result

co generators x 186,551 ops/sec ±1.20% (76 runs sampled)
async/await x 431,637 ops/sec ±0.93% (82 runs sampled)
native promises x 1,383,370 ops/sec ±0.50% (85 runs sampled)
bluebird promises x 1,896,068 ops/sec ±1.99% (80 runs sampled)
Fastest is bluebird promises

With node v10.8.0 on my local machine MacBook Pro 2016, 2,9 GHz Intel Core i5:

co generators x 279,442 ops/sec ±3.21% (64 runs sampled)
async/await x 408,913 ops/sec ±20.58% (61 runs sampled)
native promises x 2,652,819 ops/sec ±6.96% (63 runs sampled)
bluebird promises x 1,936,632 ops/sec ±8.21% (64 runs sampled)
'Fastest is native promises'

co generators x 532,403 ops/sec ±2.10% (80 runs sampled)
async/await x 730,501 ops/sec ±1.03% (78 runs sampled)
native promises x 4,403,051 ops/sec ±1.01% (81 runs sampled)
bluebird promises x 1,607,709 ops/sec ±0.70% (56 runs sampled)
Fastest is native promises

$ node -v
v11.12.0

'co generators x 436,833 ops/sec ±1.71% (78 runs sampled)'
'async/await x 4,597,435 ops/sec ±0.69% (86 runs sampled)'
'native promises x 5,108,470 ops/sec ±1.20% (84 runs sampled)'
'bluebird promises x 3,126,262 ops/sec ±0.90% (87 runs sampled)'
'Fastest is native promises'

$ node -v
v12.1.0

node v13.14.0

co generators x 328,340 ops/sec ±0.63% (84 runs sampled)
async/await x 3,504,078 ops/sec ±0.68% (84 runs sampled)
native promises x 3,590,390 ops/sec ±0.45% (87 runs sampled)
bluebird promises x 1,840,102 ops/sec ±1.12% (86 runs sampled)
Fastest is native promises

node v14.16.1

co generators x 341,121 ops/sec ±1.11% (82 runs sampled)
async/await x 3,418,420 ops/sec ±0.74% (84 runs sampled)
native promises x 2,605,891 ops/sec ±2.24% (79 runs sampled)
bluebird promises x 1,559,188 ops/sec ±2.71% (85 runs sampled)
Fastest is async/await

node v15.14.0

co generators x 320,900 ops/sec ±1.58% (79 runs sampled)
async/await x 3,384,254 ops/sec ±0.99% (86 runs sampled)
native promises x 3,005,298 ops/sec ±1.28% (86 runs sampled)
bluebird promises x 1,672,506 ops/sec ±0.29% (87 runs sampled)
Fastest is async/await

node v16.0.0

co generators x 329,304 ops/sec ±1.97% (84 runs sampled)
async/await x 3,306,700 ops/sec ±1.20% (87 runs sampled)
native promises x 3,077,731 ops/sec ±0.64% (86 runs sampled)
bluebird promises x 1,559,288 ops/sec ±0.47% (87 runs sampled)
Fastest is async/await