JSFiddle - React, Tailwind, and code Playground

JavaScript

var numbers = [];
  
for (var n = 0; n < 23456789; n++) numbers.push(n);

console.time('classic');

var result = 0;

for (var i = 0; i < numbers.length; i++) {
   var num = numbers[i] + 1;
   if (num % 3 === 0) {
      result += num;
   }
}
console.timeEnd('classic');

console.log('result: ', result);