实例化对象与void start（）之间的延迟{}

Question

我正在关注Unity教程（https://www.youtube.com/watch?v=BrlJsdP-VGo）。

我遇到的问题是，每当实例化我的玩家游戏对象的射击时，在开始移动之前会有相当长的延迟（大约1秒）。

这是我的代码：

玩家游戏对象：

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

public class Player_Controller : MonoBehaviour 
{
    public GameObject bolt;
    public float fireRate;

    private Rigidbody rb;
    private int speed = 10;
    private float nextFire;

    private void Awake()
    {
        rb = GetComponent<Rigidbody>();
    }

    void FixedUpdate () 
    {
        float mh = Input.GetAxis("Horizontal"), mv = Input.GetAxis("Vertical");
        Vector3 move = new Vector3(mh, 0f, mv);
        rb.velocity = move * speed;
        rb.position = new Vector3(Mathf.Clamp(rb.position.x, -6, 6), 0f, Mathf.Clamp(rb.position.z, -4, 8));
        rb.rotation = Quaternion.Euler(0, 0, rb.velocity.x * -5);
    }

    private void Update()
    {
        if (Input.GetKey("space") && Time.time > nextFire)
        {
            nextFire = Time.time + fireRate;
            Instantiate(bolt, new Vector3(transform.position.x, 0, 
transform.position.z + 1.25f), transform.rotation);
        }
    }
}

正在发射的照片：

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

public class Bolt_Mover : MonoBehaviour
{
    Rigidbody rb;
    public float speed;

    private void Awake()
    {
        rb = GetComponent<Rigidbody>();
    }
    private void Start()
    {
        rb.velocity = transform.forward * speed;
    }
}