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(Edited 1 time)

Here is the solution, you have to correct:

https://forum.unity3d.com/threads/impossible-to-get-perfectly-smooth-motion-with-unity.141417/

Please read and watch the video at the end.

Here another tips:

https://forum.unity3d.com/threads/linear-movement-stuttering.142754/

http://answers.unity3d.com/questions/275016/updatefixedupdate-motion-stutter-not-another-novic.html

At 50Hz both program is so smooooth, at 60 hz none of them.

I hope it can resolve the issue.

thx