Why setInterval() laggs ??

Question

I was firing a function every millisecond with setInterval(). But the function was not fired every milliseconds. It was getting lagged. Why is it so and what I can do if I want to fire setInterval() every millisecond without lagging ?

Answer 1

https://code.sololearn.com/WFbr7adx8Xev/?ref=app

Answer 2

Maybe it could do with the function executed by setInterval? Btw this effect is more pronounced with smaller intervals.