FPS counter

using UnityEngine;

public class UIFPSCounter : MonoBehaviour
{
    static UIFPSCounter mInst;

    public GameObject root;
    public UILabel label;

    int mFPS = 0;
    int mCounter = 0;
    float mElapsed = 0f;

    void OnEnable () { mInst = this; }
    void OnDisable () { if (mInst == this) mInst = null; }

    void Update ()
    {
        ++mCounter;
        mElapsed += Time.deltaTime;

        if (mElapsed > 0.5f)
        {
            mFPS = Mathf.RoundToInt(mCounter / mElapsed);
            mElapsed = 0f;
            mCounter = 0;
            if (label != null && root.activeInHierarchy) label.text = mFPS.ToString();
        }
    }

    /// <summary>
    /// Show the FPS counter.
    /// </summary>

    static public void Show ()
    {
        if (mInst != null && mInst.root != null && !mInst.root.activeSelf)
        {
            if (mInst.label != null) mInst.label.text = mInst.mFPS.ToString();
            mInst.root.SetActive(true);
        }
    }

    /// <summary>
    /// Hide the FPS counter.
    /// </summary>

    static public void Hide () { if (mInst != null && mInst.root != null && mInst.root.activeSelf) mInst.root.SetActive(false); }

    /// <summary>
    /// Toggle the FPS counter on/off.
    /// </summary>

    static public void Toggle ()
    {
        if (mInst != null && mInst.root != null)
        {
            if (mInst.root.activeSelf) Hide();
            else Show();
        }
    }
}