Run results for: Caching the DateTimeFormatter

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0) Gecko/20100101 Firefox/87.0

Browser: Firefox 87

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Un-cached	9620.2 Ops/sec
Cached	889411.8 Ops/sec

Script Preparation code:

var formatter = new Intl.DateTimeFormat('jp', {
    weekday: 'short',
})

Tests: