Jerky Lerp animation on iOS devices using IEnumerator. Any ideas?

Hey there. I'm creating a word game that uses tiles. As each tile is clicked it moves to a set position on the screen to show that it's in use. I am moving these tiles using an IEnumerator as my understanding is that is a more efficient way to do it over the Update function The code itself works fine. The only issue I have with it is that when I build to an iOS device (iPod 6 or iPad Pro 10") and play the game, this animation in particular is jerky. It runs smoothly on my laptop (MacBook Pro 2012) so I'm not sure where it's getting the extra jerkiness from. Am I doing something wrong or overloading the system somewhere? The maximum number of tiles moving at once would only ever be about 3 to 4 and even then those are just using a single frame sprite. Any thoughts on where the issue may be?

 //moves the tile to the correct position on the playing board
     IEnumerator PlayTile(Transform target)
     {
         target = TileManager.Instance.NextFreePos;
 
         while (Vector3.Distance(transform.position, target.position) > 0.05f)
         {
             transform.position = Vector3.Lerp(transform.position, target.position, smoothing * Time.deltaTime);
 
             yield return null;
         }
 
     }