Problem loading Scenes, load very slow

Hello! I'm working in a 2D game and i have a problem loading scenes. When i press the button to load a scene the scene loads very slow. I tried with a scene totally empty and also loads slow.

I Hope you can help me. This is my code:

 void FixedUpdate () {
         //play btns
         playBtn.onClick.AddListener(ShowPlay);
         playPanel.onClick.AddListener(ClosePlay);
         levelsBtn.onClick.AddListener(LevelsBtn);
 
         //Store
         storeBtn.onClick.AddListener(ShowStore);
         storePanel.onClick.AddListener(CloseStore);
 
         //options
         optionsBtn.onClick.AddListener(ShowOptions);
         optionsPanel.onClick.AddListener(CloseOptions);
     }
 
     //Play
     void ShowPlay()
     {
         playGO.SetActive(true);
     }
     void ClosePlay()
     {
         playGO.SetActive(false);
     }
     void LevelsBtn()
     {
         SceneManager.LoadScene(2);
     }

Sorry for my english :(