Run results for: Custom Event vs Callback 2

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Callback

92K/s

Custom Event

31/s

View exact numbers

Test name	Executions per second
✓ Callback	91,802 Ops/sec
Custom Event	31 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); }