Run results for: Old MutationEvents performance

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Chrome OS 14541.0.0

Device Platform: Desktop

Date tested: one year ago

Normal

4K/s

MutationEvents

35/s

View exact numbers

Test name	Executions per second
✓ Normal	4,046 Ops/sec
MutationEvents	35 Ops/sec

HTML Preparation code:

<div id="b"></div>

Script Preparation code:

function a(c) {
    c && document.addEventListener('DOMNodeInserted', () => {})
    for (let i = 100; i--;) {
        let element = b.cloneNode()
        document.body.appendChild(element)
        document.body.removeChild(element)
    }
}

Tests:

Normal
a(false)
MutationEvents
a(true)