Run results for: Custom Event vs Callback [fixed - apples to apples]

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser: Chrome 119

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Custom Event	8.5 Ops/sec
Callback	522.6 Ops/sec

Tests:

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