# Coroutine take extremely long time for simply calculation
**URL:** https://discussions.unity.com/t/coroutine-take-extremely-long-time-for-simply-calculation/647130
**Category:** Scripting
**Tags:** Scripting
**Created:** [November 27, 2016, 12:54pm UTC](https://discussions.unity.com/t/coroutine-take-extremely-long-time-for-simply-calculation/647130 "2016-11-27T12:54:06Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Pontik](https://discussions.unity.com/u/Pontik)
#### Post date: [November 27, 2016, 12:54pm UTC](https://discussions.unity.com/t/coroutine-take-extremely-long-time-for-simply-calculation/647130/1 "2016-11-27T12:54:06Z")
Hello community,
i have created here some code for a simply test for something like a asynchron calculation. But i was realy surprised to see how much time a coroutine take to count to 1000? Nearly 17 seconds?! A simply while lop will take much fewer as 1ms for that. May be i do something wrong because i can not belive it is normal time for this operation.
Here is my code:
```csharp
using UnityEngine;
using System.Linq;
using System.Diagnostics;
using System.Collections;
public class UnitTest : MonoBehaviour {
delegate void OnCalculationResult(int result);
void Start()
{
DoSomeStuff();
}
private void DoSomeStuff()
{
print("I do some stuff");
//Calculate(100, HandleResult);
StartCoroutine(Calculate(HandleResult));
print("I do some another stuff [1]");
print("I do some another stuff [2]");
print("I do some another stuff [3]");
print("I do some another stuff [x]");
}
private void HandleResult(int result)
{
print("Calculation result handled: " + result.ToString());
}
private IEnumerator Calculate(OnCalculationResult ResultHandleFunction)
{
Stopwatch watch = System.Diagnostics.Stopwatch.StartNew();
var initValue = 0;
while (initValue < 1000)
{
initValue++;
yield return null;
}
watch.Stop();
print("MyCoroutine is now finished in: " + watch.ElapsedMilliseconds.ToString() + " ms.");
ResultHandleFunction(initValue);
}
}
```
The result is: [http://shot.qip.ru/00NDav-2oHGounG8/](http://shot.qip.ru/00NDav-2oHGounG8/)
---
### Author:  [@L-Tyrosine](https://discussions.unity.com/u/L-Tyrosine)
#### Post date: [November 27, 2016, 1:03pm UTC](https://discussions.unity.com/t/coroutine-take-extremely-long-time-for-simply-calculation/647130/2 "2016-11-27T13:03:50Z")
> [@Pontik](#):
>
> i have created here some code for a simply test for something like a asynchron calculation
Coroutines does not process things [**_asynchronous_**](https://www.google.com.br/search?q=asynchronous&spell=1&sa=X&ved=0ahUKEwi__obt_8jQAhUFxpAKHYQKCesQvwUIGSgA) (like a thread would do), they just span the process over frames (or time if you use WaitForSeconds).
In your case, each iteration has to wait 1 frame
```auto
yield return null;
```
So this time that you see it is the time that 1000 frames take in your game.
---
### Author:  [@Pontik](https://discussions.unity.com/u/Pontik)
#### Post date: [November 27, 2016, 1:21pm UTC](https://discussions.unity.com/t/coroutine-take-extremely-long-time-for-simply-calculation/647130/3 "2016-11-27T13:21:58Z")
Oh, now i see! Thank you. Now it make sense for me!
---
### Author:  [@ericbegue](https://discussions.unity.com/u/ericbegue)
#### Post date: [November 27, 2016, 1:34pm UTC](https://discussions.unity.com/t/coroutine-take-extremely-long-time-for-simply-calculation/647130/4 "2016-11-27T13:34:34Z")
coroutine **!=** thread
---
### Author:  [@Pontik](https://discussions.unity.com/u/Pontik)
#### Post date: [November 27, 2016, 1:41pm UTC](https://discussions.unity.com/t/coroutine-take-extremely-long-time-for-simply-calculation/647130/5 "2016-11-27T13:41:36Z")
coroutine **!=** thread
yes, i understand. The sense of this test was **not** to make a real asyncronous operation, but the code should go further and not wait for calculation end. My keyword asynchron is wrong in this case, i know.
---
### Author:  [@Pontik](https://discussions.unity.com/u/Pontik)
#### Post date: [November 27, 2016, 2:17pm UTC](https://discussions.unity.com/t/coroutine-take-extremely-long-time-for-simply-calculation/647130/6 "2016-11-27T14:17:54Z")
My mistake was to put yield method inside the while loop. It should be on the first line inside Calculate IEnumerator. In this case it return one time wait for 1 frame and the code below will execute “callback” after it is completed. In this time the parent function where i started my coroutine can go further without waiting for a result.