JSFiddle - React, Tailwind, and code Playground

JavaScript

for(var i = 1000; i < 100000; i+=10000) {
  var avg = 0;
  var NUM_RUNS = 50000;
  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;
  }
  print(i + ": " + avg/NUM_RUNS);
  if(i == 1000) i = 0;
}