Run results for: promise vs callback vs async

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 26_0_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/140.0.7339.122 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 140

Operating system: iOS 26.0.1

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

Test name	Executions per second
✓ callback	1,514,425 Ops/sec
promise	1,197,629 Ops/sec
async	1,027,205 Ops/sec

Tests:

async
async function getData() { return new Promise((resolve, reject) => { setTimeout(() => { const data = 'Some data'; resolve(data); }, 0); }); } async function main() { const data = await getData(); console.log(data); } main();
callback
function getData(callback) { setTimeout(() => { const data = 'Some data'; callback(data); }, 0); } getData((data) => { console.log(data); });
promise
function getData() { return new Promise((resolve, reject) => { setTimeout(() => { const data = 'Some data'; resolve(data); }, 0); }); } getData().then((data) => { console.log(data)})