setInterval-bunching.js

let i = 0
const start = Date.now()
setInterval(() => console.log(++i, Date.now() - start), 1000)

console.time('bigcalc')
for (let i = 0; i < 10000000000; ++i) {
  Math.cos(37863443 * Math.exp(23749374))
}
console.timeEnd('bigcalc')


/** Result:
bigcalc: 11814.690ms
1 11818
2 12820
3 13821
4 14822
5 15824
6 16828
7 17831
8 18833
9 19833
10 20835
11 21838
**/