Unity 2d RigidBody Movement stutter

Game stuttering on object movement.

Why does it stuttering? There are micro stutters. Always near 60 fps on Android device. Camera (cinemachine) folowing the object.

Scene:

This is movement script

 using Cinemachine;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Hero_Script2 : MonoBehaviour
 {
     [SerializeField] private float Speed = 2f;
 
     public Rigidbody2D HeroRB;
 
     private Vector3 StartPos;
 
     private void Start()
     {
         Application.targetFrameRate = 300;
 
         StartPos = transform.position;
     }
 
     public void btnRestart_Clicked()
     {
         transform.position = StartPos;
     }
 
     
     private void FixedUpdate()
     {
         HeroRB.velocity = new Vector2(2f * 100f * Time.fixedDeltaTime, HeroRB.velocity.y);
     }
 }

Hero object:

Camera: