Run results for: Old MutationEvents performance 2

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:136.0) Gecko/20100101 Firefox/136.0

Browser: Firefox 136

Operating system: Linux

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
Normal	4611.0 Ops/sec
MutationEvents	2365.9 Ops/sec

HTML Preparation code:

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

Script Preparation code:

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

Tests:

Normal
a(false)
MutationEvents
a(true)

Run results for: Old MutationEvents performance 2

Normal

MutationEvents