str.split vs spread: unicodewise

gistfile1.txt

'use strict';

const str = '\ud83d\udc0e'.repeat(1e4); // 🐎
const re = new RegExp('', 'u'); // or /[^]{0}/u

let symbols;
let i;

console.time('RegExp');
for (i = 0; i < 1e4; i++) symbols = str.split(re);
console.timeEnd('RegExp');

console.time('Spread');
for (i = 0; i < 1e4; i++) symbols = [...str];
console.timeEnd('Spread');