How to move object with mouse at same rate of mouse - 2D

I have a game gui text game object and I am trying to drag it with a mouse. However, when I click to drag the object it goes much faster than my mouse. I have the following code.

 using UnityEngine;
 using System.Collections;
 
 public class DragIt : MonoBehaviour {
     
     private Vector3 handleToOriginVector;
     
     void OnMouseDown() {
         handleToOriginVector = transform.root.position - Camera.main.ScreenToWorldPoint (Input.mousePosition);
     }
     
     void OnMouseDrag() {
         transform.root.position = Camera.main.ScreenToWorldPoint (Input.mousePosition) + handleToOriginVector;
     }
 }

When I move mouse only a little the object moves in the direction of the mouse but much further than the mouse moves and keeps compounding the further I move. How can I make teh game object move with the mouse?