Simple TPP player movement in Unity

PlayerMovement.cs

using UnityEngine;
using Cinemachine;

public class PlayerMovement : MonoBehaviour
{
    public float lookSpeed = 1.5f;
    public float moveSpeed = 5f;
    public Camera cam;

    private Vector3 moveDirection = Vector3.zero;
    private float x;
    private float z;

    
    void Start()
    {
        Application.targetFrameRate = 300;
        walkSource = GetComponent<AudioSource>();
        walkSource.clip = walkClips[Random.Range(0, walkClips.Length)];
    }//Start

    private void Update()
    {
         x = Input.GetAxis(Axis.Horizontal);
         z = Input.GetAxis(Axis.Vertical);

        GetPlayerDirection();

    }//Update


    void GetPlayerDirection()
    {
        moveDirection = cam.transform.right * x + cam.transform.forward * z;
        if (moveDirection != Vector3.zero)
        {
            //Player Rotation
            Quaternion rotDir = Quaternion.LookRotation(moveDirection);
            transform.rotation = Quaternion.Euler(new Vector3(transform.rotation.eulerAngles.x,// X
                Quaternion.Slerp(transform.rotation, rotDir, Time.deltaTime * lookSpeed).eulerAngles.y, // Y
                transform.rotation.eulerAngles.z)); // Z

            //Player Movement
            moveDirection = transform.forward * moveSpeed * Time.deltaTime;

        }
        else
            moveDirection = Vector3.zero;

    }

}//class PlayerMovement