如何以与onMouseDrag相同的速度移动GameObject？

using UnityEngine;

public class MoveObject : MonoBehaviour
{
    private Vector3 startPosition;
    private Vector3 currentPosition;

    private void OnMouseDown()
    {
        startPosition = Input.mousePosition;
        // 停止刚体运动
        Rigidbody rb = GetComponent<Rigidbody>();
        if (rb != null)
        {
            rb.isKinematic = true;
        }
    }

    private void OnMouseDrag()
    {
        currentPosition = Input.mousePosition;
        Vector3 offset = currentPosition - startPosition;
        transform.position += offset * Time.deltaTime;
    }

    private void OnMouseUp()
    {
        // 恢复刚体运动
        Rigidbody rb = GetComponent<Rigidbody>();
        if (rb != null)
        {
            rb.isKinematic = false;
        }
    }
}