Unity C# - FPS Display

Unity FPSDisplay

using UnityEngine;
using UnityEngine.UI;

public class FPSDisplay : MonoBehaviour {
    
    [SerializeField] private Canvas _canvas;
    [SerializeField] private Text _text;

    [SerializeField] private float _refreshTime = 0.5f;
    private float _timer = 0;
    private int _frameCount = 0;

    [SerializeField] private bool _isEnabled = false;
    private bool _isEnabled_cached = false;

    private void Awake() {
        _isEnabled_cached = _isEnabled;
        if(_text == null) {
            _text = this.GetComponentInChildren<Text>();
        }
        if(_canvas != null) {
            _canvas.enabled = _isEnabled;
        }
    }
    private void Update() {

#if UNITY_EDITOR
        if(Input.GetKeyDown(KeyCode.F)) {
            _isEnabled = !_isEnabled;
        }
#endif
        //if(OVRInput.GetDown(OVRInput.Button.Four)) {
        //    _isEnabled = !_isEnabled;
        //}
        if(_isEnabled != _isEnabled_cached) {
            _isEnabled_cached = _isEnabled;
            if(_canvas != null) {
                _canvas.enabled = _isEnabled;
            }
        }
        if(_isEnabled) {
            Measure2();
        }

    }

    private void Measure1() {
        if(_text == null) return;

        _timer += Time.unscaledDeltaTime;
        _frameCount++;
        if(_timer > _refreshTime) {
            float DTavg = _timer / _frameCount;
            float millis = Mathf.Round(DTavg * 1000);
            float fps = Mathf.Round(1f / DTavg);
            _text.text = millis + " ms\n" + fps + " fps";
            _timer = 0;
            _frameCount = 0;
        }
    }

    private void Measure2() {
        if(_text == null) return;

        if(_timer < _refreshTime) {
            _timer += Time.unscaledDeltaTime;
            _frameCount++;
        } else {
            float millis = Mathf.Round(1000f * _timer / _frameCount);
            float fps = Mathf.Round((float)_frameCount / _timer);
            _text.text = millis + " ms\n" + fps + " fps";
            _timer = 0;
            _frameCount = 0;
        }
    }

}