Run results for: cached getComputedStyle vs. getBoundingClientRect

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

getComputedStyle

586/s

getBoundingClientRect

573/s

View exact numbers

Test name	Executions per second
✓ getComputedStyle	586 Ops/sec
getBoundingClientRect	573 Ops/sec

HTML Preparation code:

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

Tests:

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