JSFiddle - React, Tailwind, and code Playground

JavaScript

for(var i = 10; i < 100000; i*=5) {
   var avg = 0;
   var NUM_RUNS = 10000;
   for(var k = 0; k < NUM_RUNS; k++) {
      var arr = new Array(i);
      for(var j = 0; j < arr.length; j++) arr[j] = Math.random();
      var start = (new Date).getTime();
      arr.splice(5, 3);
      avg += (new Date).getTime() - start;
   }
   document.write(avg/NUM_RUNS + "<br>");
}