Run results for: Date.now() vs Performance.measure()

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0

Browser: Firefox 74

Operating system: Windows 8.1

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
performance.mark	219654.9 Ops/sec
Date.now	597512.7 Ops/sec
performance.mark + performance.measure	15.2 Ops/sec

Script Preparation code:

var times = [];

Tests:

performance.mark
var i = Math.random() + '' + Date.now(); performance.mark(i + 'start'); performance.mark(i + 'end' );
Date.now
var i = Math.random() + '' + Date.now(); times.push(Date.now() + 'start' + i); times.push(Date.now() + 'end' + i);
performance.mark + performance.measure
var i = Math.random() + '' + Date.now(); performance.mark(i + 'start'); performance.mark(i + 'end' ); performance.measure(i, i + 'start', i + 'end')