Simple FPS experimentations for unity framerate FPS / vsync

Framerate.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// 
/// https://docs.unity3d.com/ScriptReference/Application-targetFrameRate.html
/// 
/// On standalone platforms the default frame rate is maximum achievable frame rate.
/// 
/// On mobile platforms the default frame rate is less than the maximum achievable frame rate due to need to conserve battery power. 
/// Typically on mobile platforms the default frame rate is 30 frames per second.
/// 
/// Additionally if the QualitySettings.vSyncCount property is set, the targetFrameRate will be ignored and 
/// instead the game will use the vSyncCount and the platform's default render rate to determine the target frame rate. 
/// For example, if the platform's default render rate is 60 frames per second and vSyncCount is set to 2, 
/// the game will target 30 frames per second.
/// 
/// </summary>

public class Framerate : MonoBehaviour
{

  public float prevTime = 0f;
  public float delta = 0f;
  float guiDelta = 0;
  int updateDisplayFrameCount = 0;

  private void Start()
  {
    prevTime = Time.time;
    
    //Application.targetFrameRate = 60;
  }

  private void Update()
  {

    if (Input.GetMouseButtonUp(1))
    {
      if (touchCorner())
      {
        QualitySettings.vSyncCount++;
        if (QualitySettings.vSyncCount > 2) QualitySettings.vSyncCount = 0;
      }
    }
    else if (Input.GetMouseButtonUp(0))
    {
      if (touchCorner())
      {
        if (Application.targetFrameRate < 0) Application.targetFrameRate = 60;
        else Application.targetFrameRate = -1;
      }
    }
    

    delta = Time.time - prevTime;
    prevTime = Time.time;

    if (updateDisplayFrameCount < 0)
    {
      guiDelta = 1f / delta;
      updateDisplayFrameCount = 5;
    }
    else updateDisplayFrameCount--;

  }
  
  GUIStyle style;
  private void OnGUI()
  {
    if (style == null)
    {
      style = new GUIStyle();
      style.fontSize = (int)(Screen.width / 20f);
      style.richText = true;
      style.alignment = TextAnchor.UpperRight;
    }
    
    string ct = "";

    int target = Application.targetFrameRate;

    string color = guiDelta > target * 0.95f ? "green" : (guiDelta > target * 0.5f) ? "orange" : "red";
    
    ct += "<color="+color+"><b>"+Mathf.CeilToInt(guiDelta)+"</b></color> / "+Application.targetFrameRate+" / vs"+QualitySettings.vSyncCount;
    ct += "\n" + delta;

    int width = 400;
    Rect rec = new Rect(Screen.width - width, 0, width, width);
    //GUI.TextField(rec, ct, style);
    GUI.Label(rec, ct, style);

  }

  bool touchCorner()
  {
    Vector2 pos = getTouchScreenPosition();
    if (Input.mousePosition.x > Screen.width - 100f && Input.mousePosition.y > Screen.height - 100f) return true;
    return false;
  }

  static public Vector3 getTouchScreenPosition()
  {
    if (Input.touches.Length > 0)
    {
      Touch t = Input.touches[0];
      return t.position;
    }

    return Input.mousePosition;
  }

}