No-smooth movement

Where is mistake, that after use Time.deltaTime is movement still no-smooth? Weak computer?
Thanks Mirek

Code (CSharp):

1.  
2. public class Player : MonoBehaviour {
3.  
4.     public float distance = -0.46f;
5.     public Vector2[] GridyX = new Vector2[10];
6.     public Vector2[] GridyY = new Vector2[10];
7.  
8.  
9.  
10.     // Use this for initialization
11.     void Start() {
12.  
13.         GridyX[0] = new Vector2 (-0.46f, 0.0f);
14.        
15.         transform.Translate(new Vector2(0, 0));
16.     }
17.  
18.     // Update is called once per frame
19.     void Update() {
20.  
21.         if (Input.GetKey(KeyCode.RightArrow))
22.  
23.             transform.Translate(new Vector3(distance * Time.deltaTime, 0.0f, 0.0f));
24.  
25.         if (Input.GetKey(KeyCode.LeftArrow))
26.  
27.             transform.position += new Vector3(-distance * Time.deltaTime, 0.0f, 0.0f);
28.  
29.         if (Input.GetKeyDown(KeyCode.DownArrow))
30.  
31.             transform.Translate(new Vector2(-0.46f, 0f));
32.  
33.         if (Input.GetKeyDown(KeyCode.UpArrow))
34.  
35.             transform.Translate(new Vector2(-distance * Time.deltaTime, 0f));
36.