How did you make an accurate FPS counter?

[spsquared]

I'm currently using an inaccurate fps counter because it actually counts the tps of the client instead of the fps.
I found this but it's not quite right.

const times = [];
let fps;

function refreshLoop() {
  window.requestAnimationFrame(() => {
    const now = performance.now();
    while (times.length > 0 && times[0] <= now - 1000) {
      times.shift();
    }
    times.push(now);
    fps = times.length;
    refreshLoop();
  });
}

refreshLoop();

[spsquared]

oh you use that
its unstable which is the problem