Okay. I’m making an infinit runner. But I can’t figure out how to remove objects that I’ve run past.
I am very sorry if my code is bad. This is my first game.
I need a no-lag solution. 
IF you want to see what the game looks like:
HERE IS THE CODE:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class generation : MonoBehaviour {
private float speed = 5f;
public static float groundNumber = 10;
private float passedNumber = 0f;
GameObject startPlatform;
GameObject gro
public float id = 0f;
//PREFABS FOR INSTANSIATE
public static GameObject wallPrefab;
public static float genNumber;
public static GameObject groundPrefab;
// Use this for initialization
void Start () {
startPlatform = GameObject.Find("StartingPlatform");
wallPrefab = GameObject.Find("Wall");
groundPrefab = GameObject.Find("StartingPlatform");
gameObject.GetComponent<playerController>();
wallPrefab.GetComponent<Renderer>().material.color = Color.green;
groundPrefab.GetComponent<Renderer>().material.color = Color.white;
groundNumber = 10;
neverRepeat = false;
neverRepeat2 = false;
neverRepeat3 = false;
neverRepeat4 = false;
}
public static bool neverRepeat = false;
public static bool neverRepeat2 = false;
public static bool neverRepeat3 = false;
public static bool neverRepeat4 = false;
private int wall = 0;
// Update is called once per frame
void DestroyPlatform ()
{
}
void FixedUpdate () {
#region Ground
GameObject ground = GameObject.CreatePrimitive(PrimitiveType.Cube);
ground.transform.position = new Vector3(0, -1, 0);
ground.transform.localScale = new Vector3(10, 1, 10);
ground.tag = "platformNumber";
ground.transform.position = new Vector3(0, -1, groundNumber);
ground.GetInstanceID();
groundNumber += 10;
if (groundNumber > 1000 && neverRepeat == false)
{
Debug.Log("Ground Number is more than 1000");
neverRepeat = true;
playerController.movementSpeed += 2f;
id = +1;
}
if (groundNumber > 3000 && neverRepeat2 == false)
{
Debug.Log("Ground Number is more than 3000");
neverRepeat2 = true;
playerController.sideMoveSpeed += 0.01f;
playerController.movementSpeed += 2f;
}
if (groundNumber > 5000 && neverRepeat3 == false)
{
Debug.Log("Ground Number is more than 5000");
neverRepeat3 = true;
playerController.movementSpeed += 1f;
}
if (groundNumber > 7000 && neverRepeat4 == false)
{
Debug.Log("Ground Number is more than 7000");
neverRepeat4 = true;
playerController.sideMoveSpeed += 0.01f;
playerController.movementSpeed += 1f;
}
#endregion
Vector3 wallPOS = new Vector3(Random.Range(-5f, 5f), 0, Random.Range(-5f, 5f) + id);
Instantiate(wallPrefab, wallPOS, Quaternion.identity);
id += 10;
}
}