Run results for: callback vs event

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0

Browser: Firefox 136

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

callback

361K/s

event

1K/s

View exact numbers

Test name	Executions per second
✓ callback	360,733 Ops/sec
event	1,384 Ops/sec

Tests:

event
const results = []; function cb() { results[0] = 1; } let i = 1001; eventTarget = new EventTarget(); eventTarget.addEventListener('customtype', cb); while (--i) { eventTarget.dispatchEvent(new Event('customtype')); }
callback
const results = []; function cb() { results[0] = 1; } let i = 1001; while (--i) { cb(); }