Run results for: jQuery AJAX vs Fetch API

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 14

Operating system: iOS 14.5.1

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
jQuery test case	32589.1 Ops/sec
Vanilla JS test case	127250.8 Ops/sec

HTML Preparation code:

<script src='https://code.jquery.com/jquery-3.6.0.min.js'></script>

Tests:

jQuery test case
$.ajax({ type: 'POST', url: "http://vanilla-js.com/path/to/api", data: {'banana': 'yellow'}, success: (data) = {}, });
Vanilla JS test case
const sendAjax = (url, data, callback) => { fetch(url, { method: 'POST', body: new URLSearchParams(data), }).then((response) => { const contentType = response.headers.get("content-type"); if (contentType && contentType.indexOf("application/json") !== -1) { return response.json().then(data => {callback(data)}); } else { return response.text().then(text => {callback(text)}); } }); } sendAjax('http://vanilla-js.com/path/to/api', {'banana': 'yellow'}, (data) => {});