Vector3.Lerp result in "laggy" movement while running on iOS devices

I know this question has been asked for many times but I've tried all the proposed solutions and none of them fix...

Possible solutions that I've tried:
1. Use FixedUpdate instead of Update
2. Use smoothDeltaTime instead of deltaTime
3. Use SmoothDamp instead of Lerp
4. Use LateUpdate instead of Update

Here's my codes

Code (csharp):

1. void Update()
2.     {
3.         time += (Time.deltaTime / duration);
4.         if (time > 1.0f)
5.             time = 1.0f;
6.         Vector3 newPos = Vector3.Lerp(startPos, endPos, time);
7.         transform.position = newPos;
8.     }

When I try to run it on iOS devices, it run very jaggy/laggy..
I remember last time when I was using Unity 3.x, it doesn't has this problem.