Run results for: clientWidth / clientHeight vs. getBoundingClientRect()

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

getBoundingClientRect() (simple property access)

2.7M/s

getBoundingClientRect() (destructured)

2.4M/s

clientWidth / clientHeight (destructured)

1.7M/s

clientWidth / clientHeight (simple property access)

1.6M/s

clientWidth / clientHeight (destructured and renamed)

1.6M/s

View exact numbers

Test name	Executions per second
✓ getBoundingClientRect() (simple property access)	2,713,957 Ops/sec
getBoundingClientRect() (destructured)	2,406,820 Ops/sec
clientWidth / clientHeight (destructured)	1,732,151 Ops/sec
clientWidth / clientHeight (simple property access)	1,607,994 Ops/sec
clientWidth / clientHeight (destructured and renamed)	1,594,510 Ops/sec

HTML Preparation code:

<div id="el">
  <h2>Lorem ipsum dolor sit amet</h2>
</div>

Script Preparation code:

var el = document.getElementById("el");

Tests:

clientWidth / clientHeight (destructured and renamed)
const { clientWidth: width, clientHeight: height } = el; const perim = (width + height) * 2;
clientWidth / clientHeight (destructured)
const { clientWidth, clientHeight } = el; const perim = (clientWidth + clientHeight) * 2;
clientWidth / clientHeight (simple property access)
const width = el.clientWidth; const height = el.clientHeight; const perim = (width + height) * 2;
getBoundingClientRect() (destructured)
const { width, height } = el.getBoundingClientRect(); const perim = (width + height) * 2;
getBoundingClientRect() (simple property access)
const rect = el.getBoundingClientRect(); const width = rect.width; const height = rect.height; const perim = (width + height) * 2;