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Check how long an operation takes

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Original file line number	Diff line number	Diff line change
`@@ -93,3 +93,13 @@ Array(6).join('👽')`
`93`	`93`	`//👽👽👽👽👽👽`
`94`	`94`
`95`	`95`	```
	`96`	`+#Check how long an operation takes`
	`97`	+```javascript
	`98`	`+//The performance.now() method returns a DOMHighResTimeStamp, measured in milliseconds.`
	`99`	`+//performance.now() is relative to page load and more precise in orders of magnitude. Use cases include benchmarking and other cases where a high-resolution time is required such as media (gaming, audio, video, etc.)`
	`100`	`+`
	`101`	`+var startTime=performance.now();`
	`102`	`+doSomething();`
	`103`	`+constendTime=performance.now();`
	`104`	`+console.log("this doSomething took"+ (endTime- startTime)+" milliseconds.");`
	`105`	+```

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