C＃方法第一次运行比第一次运行慢

Question

I made this code

using UnityEngine;

public class InstanceTest : MonoBehaviour { 
public int cnt; public bool startTest1 = false; public bool startTest2 = false;

 void Update()
 {
     if (startTest1)
         Test1(cnt);
     if (startTest2)
         Test2(cnt);
 }
 void Test1(int cnt)
 {
     float a;
     for (int i = 0; i < cnt; i++)        
         a = 1f + 1f;        
 }
 static void Test2(int cnt)
 {
     float a;
     for (int i = 0; i < cnt; i++)        
         a = 1f + 1f;        
 }
}

On Profiler

enter image description here

why CPU Time on Update() hiccup when call Test1() and Test2() at first time?

Answer 1

There's probably some JIT (Just In Time) compilation happening during the first call of the functions.

The second and subsequent times the functions are called, there's an optimized version of them waiting.