Run results for: Custom Event vs Callback

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0

Browser: Firefox 139

Operating system: Windows

Device Platform: Desktop

Date tested: 10 months ago

Test name	Executions per second
Custom Event	852.1 Ops/sec
Callback	220.4 Ops/sec

Tests:

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