My player is stuttering when moving

Unity Engine
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1

I am having an issue with jittery player movement. I have tried changing the interpolation, playing around with the Lerp speed and regular speed variables, and changing the movement physics between update and fixedUpdate.

Here is my code:

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

public class PlayerMovement : MonoBehaviour
{
    public float speed = 5f;  // Movement speed
    public float drag = 5f;   // Drag to reduce sliding

    private Rigidbody rb;

    void Start()
    {
        rb = GetComponent<Rigidbody>();
        rb.drag = drag;  // Set drag to the Rigidbody
    }

    void FixedUpdate()
    {
        // Get input
        float moveHorizontal = Input.GetAxis("Horizontal");
        float moveVertical = Input.GetAxis("Vertical");

        // Create movement vector
        Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical) * speed;

        if (movement.magnitude > 0)
        {
            // Apply movement
            Vector3 targetVelocity = new Vector3(movement.x, rb.velocity.y, movement.z);
            rb.velocity = targetVelocity;
        }
        else
        {
            // Stop the player from sliding by zeroing out the velocity
            rb.velocity = new Vector3(0, rb.velocity.y, 0);
        }
    }
}

I am using a rigidbody on a capsule with a capsule collider on a plane with a mesh collider and renderer.