Edit: Never mind, I see your already position from an invisible object. Weird, I am doing the same thing and I don't have the problem.
Edit 2: Well, I looked at my code, and I have it always setting the two objects relative to a tall, rectangular, invisible player object. It is all on one "always" event line. I see no lag at all using this method. I also have machine independant speed turned ON so maybe you could try turning it on if you don't already have it on. Also, are you sure your not imagining things? I have not looked at the file but some other people can't see a problem, so maybe it just looks off to you but it's not?
Edited by the Author.
99 percent chance that the above post is 100 percent correct.