FpsLog.cs

using UnityEngine;
using UnityEngine.UI;

namespace Dev
{
    [RequireComponent(typeof(Text))]
    public class FpsLog : MonoBehaviour
    {
        float _deltaTime = 0.0f;
        
        private void Update()
        {
            _deltaTime += (Time.unscaledDeltaTime - _deltaTime) * 0.1f;
            var fps = (int) (1.0f / _deltaTime);
            Debug.Log($"Fps: {fps} [{Application.targetFrameRate}]");
        }
    }
}