1.代码方面优化，整合函数，将代码分配到物体上不要全放在主角上，代码清晰。

2.改变camera渲染范围。

3.灯光的使用会增加CPU负担，将光源烘焙为光照贴图，只对static物体有用。Compression。

4.限制鼠标在游戏窗口内功能。

using System.Runtime.InteropServices;public class shubiao : MonoBehaviour {    public struct POINTAPI   //POINTAPI是自定义的类名    {        public int x;        public int y;    }    //鼠标可以强行冲出窗口，再被代码拉回游戏，效果不是很好    [DllImport("user32.dll")]    public static extern bool GetCursorPos(ref POINTAPI p);    [DllImport("user32.dll")]//导入库，并申明一个命令    public static extern int SetCursorPos(int x, int y);    [DllImport("user32.dll")]    public static extern bool GetCursorPos(ref int x1, ref int y1);    bool ck = false;	// Use this for initialization	void Start () {        SetCursorPos(200, 200);	}		// Update is called once per frame	void Update () {        if (!ck)        {            //if (Input.mousePosition.x < 1) { SetCursorPos(Mathf.RoundToInt(Screen.width * 0.5f), Mathf.RoundToInt(Input.mousePosition.y)); }            //if (Input.mousePosition.y < 1) { SetCursorPos(Mathf.RoundToInt(Input.mousePosition.x), Mathf.RoundToInt(Screen.height * 0.5f)); }            //if (Input.mousePosition.x > Screen.width - 5) { SetCursorPos(Mathf.RoundToInt(Screen.width * 0.5f), Mathf.RoundToInt(Input.mousePosition.y)); }            if (Input.mousePosition.x < 5)            {                /*int x1 = 0;                  int y1 = 0;                  if (GetCursorPos(ref x1, ref y1))//注意ref用法                       SetCursorPos(x1 + 10, y1);   */                POINTAPI p1 = new POINTAPI();                if (GetCursorPos(ref p1))                    SetCursorPos(p1.x + 10, p1.y);                    }            if (Input.mousePosition.y < 5)            {                /*int x2 = 0;                  int y2 = 0;                  if (GetCursorPos(ref x2, ref y2))                      SetCursorPos(x2, y2 - 10);*/                POINTAPI p2 = new POINTAPI();                if (GetCursorPos(ref p2))                    SetCursorPos(p2.x, p2.y - 10);            }            if (Input.mousePosition.x > Screen.width - 5)            {                /* int x3 = 0;                   int y3 = 0;                   if (GetCursorPos(ref x3, ref y3))                       SetCursorPos(x3 - 10, y3);*/                POINTAPI p3 = new POINTAPI();                if (GetCursorPos(ref p3))                    SetCursorPos(p3.x - 10, p3.y);            }                        }	}    void OnApplicationFocus()    {        ck = !ck;    }