Run results for: Custom Event vs Callback (with actual call)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Callback

803/s

Custom Event

12/s

View exact numbers

Test name	Executions per second
✓ Callback	803 Ops/sec
Custom Event	12 Ops/sec

Tests:

Custom Event
let i = 1001; const results = []; window.addEventListener('custom:test', function () { console.log('hi'); }); while (--i) { window.dispatchEvent(new CustomEvent('custom:test')); }
Callback
function cb() { console.log('hi') } let i = 1001; const results = []; while (--i) { cb(); }