how to get the time on how long a code takes in javascript code example
Example 1: Javascript measure function run time
var startTime = performance.now();
alert('Run some function here');
var endTime = performance.now();
var totalTime=endTime-startTime;// time took to run in milliseconds
alert('Total time:'+totalTime +'ms');
Example 2: javascript console log execution time
var t0 = performance.now()
doSomething() // <---- The function you're measuring time for
var t1 = performance.now()
console.log("Call to doSomething took " + (t1 - t0) + " milliseconds.")