Run results for: Custom Event vs Callback 2

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/27.0 Chrome/125.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 125

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Callback

90K/s

Custom Event

21/s

View exact numbers

Test name	Executions per second
✓ Callback	89,811 Ops/sec
Custom Event	21 Ops/sec

Tests:

Custom Event
let i = 1001; const results = []; window.addEventListener('custom:test', (evt) => { results.push(`Custom Event ${evt.detail.idx}`); }); while (--i) { window.dispatchEvent(new CustomEvent('custom:test', { detail: { idx: i } })); }
Callback
const results = []; function cb(i) { results.push(`Callback ${i}`); } let i = 1001; while (--i) { cb(i); }