FPS Counter (Frames Per Second)

fps.ts

export class FpsCounter {
  constructor(private maxSamples: number = 100) {}

  private samples: number[] = [];

  sample() {
    this.samples.push(Date.now());
    if (this.samples.length > this.maxSamples) {
      this.samples.shift();
    }

    return this.count();
  }

  count() {
    if (this.samples.length < 2) {
      return 0;
    }
    const start = this.samples[0];
    const end = this.samples[this.samples.length - 1];
    return this.samples.length * (1000 / (end - start));
  }
}