Simple example on how to drop some frame, optimising calculations, or renders every N frames on a RequestAnimationFrame update method. (ES6)

update.js

let lastTime = Date.now();
const N = 24;

update() {
    requestAnimationFrame(update);

    // refresh only N times per second
    if (Date.now() - lastTime < 1000 / N) {
        return;
    }
    lastTime = Date.now()
    
    // do some calculations
}