Run results for: Vanilla JS, Cash and jQuery - GetID Speed Test

Run details:

User agent: Mozilla/5.0 (Linux; Android 9; ONEPLUS A6013) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.101 Mobile Safari/537.36

Browser: Chrome Mobile 75

Operating system: Android

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
getElementById()	2175987.2 Ops/sec
getElementsByClassName()	1387416.9 Ops/sec
getElementsByTagName()	1640962.6 Ops/sec
querySelector(#id)	1091794.2 Ops/sec
querySelector(.id)	1493195.8 Ops/sec
querySelectorAll(#id)	605074.2 Ops/sec
querySelectorAll(.id)	771127.6 Ops/sec
jQuery(#id)	847781.6 Ops/sec
jQuery(.id)	459279.4 Ops/sec
jQuery(tag#id)	258905.0 Ops/sec
jQuery(tag.id)	273361.0 Ops/sec
jQuery + getElementById	966017.7 Ops/sec
jQuery + getElementsByClassName	366839.8 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"><script>
<script>jQuery.noConflict();</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/cash/7.0.3/cash.min.js"></script>
<div id="foo" class="foo2"></div>

Tests:

getElementById
var el = document.getElementById("foo"); var className = el.className;
getElementsByClassName
var el = document.getElementsByClassName("foo2"); var className = el.className;
getElementsByTagName
var el = document.getElementsByTagName("div")[0]; var className = el.className;
querySelector (#id)
var el = document.querySelector('#foo'); var className = el.className;
querySelector (.id)
var el = document.querySelector('.foo2'); var className = el.className;
querySelectorAll (#id)
var el = document.querySelectorAll('#foo'); var className = el.className;
querySelectorAll (.id)
var el = document.querySelectorAll('.foo2'); var className = el.className;
Cash (#id)
var el = $("#foo"); var className = el.className;
Cash (.id)
var el = $(".foo2"); var className = el.className;
Cash (tag#id)
var el = $("div#foo"); var className = el.className;
Cash (tag.id)
var el = $("div.foo2"); var className = el.className;
Cash + getElementById
var el = $(document.getElementById("foo")); var className = el.className;
Cash + getElementsByClassName
var el = $(document.getElementsByClassName("foo2")); var className = el.className;
jQuery (#id)
var el = jQuery("#foo"); var className = el.className;
jQuery (.id)
var el = jQuery(".foo2"); var className = el.className;
jQuery (tag#id)
var el = jQuery("div#foo"); var className = el.className;
jQuery (tag.id)
var el = jQuery("div.foo2"); var className = el.className;
jQuery + getElementById
var el = jQuery(document.getElementById("foo")); var className = el.className;
jQuery + getElementsByClassName
var el = jQuery(document.getElementsByClassName("foo2")); var className = el.className;

Run results for: Vanilla JS, Cash and jQuery - GetID Speed Test

getElementById

getElementsByClassName

getElementsByTagName

querySelector (#id)

querySelector (.id)

querySelectorAll (#id)

querySelectorAll (.id)

Cash (#id)

Cash (.id)

Cash (tag#id)

Cash (tag.id)

Cash + getElementById

Cash + getElementsByClassName

jQuery (#id)

jQuery (.id)

jQuery (tag#id)

jQuery (tag.id)

jQuery + getElementById

jQuery + getElementsByClassName