Rigidbody stutter in Unity 2019.3.9f1

Hello. I’m having issues getting my rigidbody character to move smoothly. I’ve tried the interpolate option on each setting but it doesn’t seem to have an effect. Any ideas would be appreciated.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerMovement : MonoBehaviour
    public float moveSpeed = 5;
    public float rotationSpeed = 450;
    public Rigidbody rb;

    private Camera cam;

    Vector3 movement;

    void Start()
        cam = Camera.main;
    private void FixedUpdate()

    void Movement()
        movement.x = Input.GetAxisRaw("Horizontal");
        movement.z = Input.GetAxisRaw("Vertical");
        rb.MovePosition(transform.position + movement * moveSpeed * Time.fixedDeltaTime);

    void faceMouse()
        Vector3 mousePos = Input.mousePosition;
        mousePos = cam.ScreenToWorldPoint(new Vector3(mousePos.x, mousePos.y, cam.transform.position.y - transform.position.y));
        rb.rotation = Quaternion.LookRotation(mousePos - transform.position);

Nevermind. I figured it out. Turns out it wasn’t the character movement but the camera movement causing the issue. I needed to also put the camera transform in a FixedUpdate.