JSFiddle - React, Tailwind, and code Playground

JavaScript

var arrayCount = 10000;

var dynamicArrays = [];

for(var j=0;j<arrayCount;j++)
		dynamicArrays[j] = [];

var lastLongI = 1;

for(var i=0;i<10000;i++)
{
		var before = Date.now();
		for(var j=0;j<arrayCount;j++)
    		dynamicArrays[j][i] = i;
    var span = Date.now() - before;
    if (span > 10)
    {
    	console.log(i + ": " + span + "ms" + " " + (i / lastLongI));
      lastLongI = i;
    }
}