Write simple vanilla JS performance tests.
If you just want to log results to the console
console.time('My awesome performance test!'); // Do some JS stuff... console.timeEnd('My awesome performance test!'); // This will log "My awesome performance test!: 1234.567ms" (with the actual time, of course)
If you want to render the results into the DOM/UI
var start = performance.now(); // Do some JS stuff... var end = performance.now(); console.log('This took ' + (end - start) + 'ms to complete');