Run results for: toUpperCase vs toLowerCase - true

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

toLowerCase

666.8M/s

toUpperCase

34.3M/s

View exact numbers

Test name	Executions per second
✓ toLowerCase	666,824,640 Ops/sec
toUpperCase	34,323,428 Ops/sec

Script Preparation code:

var text = 'SOME ARE UPPER some are lower';

Tests: