Unity3D FPSDisplay Counter

using UnityEngine;
/// <summary>
/// GUI FPS Display Counter with ms
/// JustPrototype
/// </summary>
public class FPSDisplay : MonoBehaviour
{
    private float deltaTime;
    private float updateDelay;
    private float msec;
    private float fps;
    private string text;

    private void Start()
    {
        this.updateDelay = Time.time + 0.5f;
    }

    private void Update()
    {
        this.deltaTime += (Time.deltaTime - this.deltaTime) * 0.1f;
    }

    private void OnGUI()
    {
        int width = Screen.width;
        int height = Screen.height;
        GUIStyle guistyle = new GUIStyle();
        Rect position = new Rect(0f, 0f, (float)width, (float)(height * 2 / 100));
        guistyle.alignment = TextAnchor.UpperLeft;
        guistyle.fontSize = height * 2 / 100;
        guistyle.normal.textColor = new Color(0f, 0f, 0.5f, 1f);
        if (Time.time > this.updateDelay)
        {
            this.msec = this.deltaTime * 1000f;
            this.fps = 1f / this.deltaTime;
            this.text = string.Format("{0:0.0} ms ({1:0.} fps)", this.msec, this.fps);
            this.updateDelay = Time.time + 0.5f;
        }
        GUI.Label(position, this.text, guistyle);
    }
}