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Tip: How to Measure the Performance of a Script in JavaScript

How to use the Performance API to compute the execution time for a piece of code in JavaScript.


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We can now use the Performance API to compute the execution time for a piece of code in JavaScript.

//capture the start time in a variable.
var timeStart = performance.now();
//run a time consuming task.
for (counter = 0; counter     //Do some processing
   var temp = temp + counter * counter;
}
//capture the current time
var timeEnd = performance.now();
//measure the compute time
console.log("Processing time is " + (timeEnd - timeStart) + " milliseconds.")

 

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