An FPS counter.

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using UnityEngine;

using System.Collections;

// An FPS counter.

// It calculates frames/second over each updateInterval,

// so the display does not keep changing wildly.

public class Test : MonoBehaviour {

    public float updateInterval = 0.5F;

    private double lastInterval;

    private int frames = ;

    private float fps;

    void Start() {

        lastInterval = Time.realtimeSinceStartup;

        frames = ;

    }

    void OnGUI() {

        GUILayout.Label("fps:" + fps.ToString("f2"));

    }

    void Update() {

        ++frames;

        float timeNow = Time.realtimeSinceStartup;

        if (timeNow > lastInterval + updateInterval) {

            fps = (float)(frames / (timeNow - lastInterval));

            frames = ;

            lastInterval = timeNow;

        }

    }

}