Run results for: jQuery 3.3.1 selector vs jQuery 2.1.4 vs document.querySelector vs document.getElementById length

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.2 Safari/605.1.15

Browser: Safari 14

Operating system: Mac OS X 10.15.6

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
jQuery 3.3.1	1754599.0 Ops/sec
jQuery 2.1.4	1824167.0 Ops/sec
Vanilla JS querySelector	3200324.0 Ops/sec
Vanilla JS getElementById	4517563.0 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>
<script type="text/javascript">
  var jq331 = $.noConflict(true);
</script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.js'></script>
<script type="text/javascript">
  var jq214 = $.noConflict(true);
</script>
<div id="testElement"></div>

Tests:

jQuery 3.3.1
var el = jq331("#testElement"); var className = el.length;
jQuery 2.1.4
var el = jq214("#testElement"); var className = el.length;
Vanilla JS querySelector
var el = document.querySelector('#testElement'); var className = el.id;
Vanilla JS getElementById
var el = document.getElementById('testElement'); var className = el.id;

Run results for: jQuery 3.3.1 selector vs jQuery 2.1.4 vs document.querySelector vs document.getElementById length

Comparing speed of jQuery 3.3.1 selector, jQuery 2.1.4, vanilla JS querySelector, and vanilla JS getElementById

jQuery 3.3.1

jQuery 2.1.4

Vanilla JS querySelector

Vanilla JS getElementById