const a = 'alfa';
const b = 'bravo';
const c = 'charlie';
const d = 'delta';
const e = 'echo';

let t = performance.now();

for (let i = 0; i < 14000; i++) {
  let _ = a + b + c + d + e;
  // console.log(Porffor.memorySize());
}

console.log(performance.now() - t);