Problem with instantiate and destroy multiple objects

 Guys, I did the following code that instantiates 50 objects simultaneously and after 1 second destroys all of them and it works, but the instantiates the game gives a little "locked", probably because of the loop during instantiation. How could I do this without this absurd drop fps, optimizing the code?

Also, how do I instantiate objects scattered on the player's field of view? (First Person) (Does not work as it is in the code)

   var teste                 :GameObject[];
 
     function Start () {
     teste = new GameObject[50];
     
     }
     
     if(Raio.RaioCaiu==true)
         {
             for(sentinela=0;sentinela<25;sentinela++)
             {    
                 teste[sentinela]=Instantiate(prefab, new Vector3(Jogador.PosicaoJogador.x+Random.Range(0, 180), Jogador.PosicaoJogador.y, Jogador.Frente.z), Quaternion.identity);
                 teste[25+sentinela]=Instantiate(prefab, new Vector3(Jogador.PosicaoJogador.x-Random.Range(0, 180), Jogador.PosicaoJogador.y, Jogador.PosicaoJogador.z-Random.Range(10, 30)), Quaternion.identity);
             }
         }
         else
         {
             for(sentinela=0;sentinela<50;sentinela++)
                 Destroy(teste[sentinela], 1);
         }