Run results for: promise vs callback

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 13_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 13

Operating system: iOS 13.4

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
async	3002678.0 Ops/sec
callback	30203292.0 Ops/sec

Tests: