Run results for: cached getComputedStyle vs. getBoundingClientRect 442 - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
getComputedStyle	166.9 Ops/sec
getBoundingClientRect	319.9 Ops/sec

HTML Preparation code:

<div id="foo">test</div>

AخA
 
<div id="foo">test</div>

Tests:

getComputedStyle
const elem = document.getElementById("foo"); var i = 5000; while (i--) { getHeight(); } function getHeight() { return parseFloat(getComputedStyle(elem).height); }
x

const elem = document.getElementById("foo");

var i = 5000;
while (i--) {
getHeight();
}

function getHeight() {
return parseFloat(getComputedStyle(elem).height);
}
getBoundingClientRect
const elem = document.getElementById("foo"); var i = 5000; while (i--) { getHeight(); } function getHeight() { return elem.getBoundingClientRect().height; }
const elem = document.getElementById("foo");

var i = 5000;
while (i--) {
getHeight();
}

function getHeight() {
return elem.getBoundingClientRect().height;
}