8 Directional Movement WASD for Unity

using UnityEngine;
using System.Collections;

public class Move : MonoBehaviour {

    float speed = 7f;

    // Use this for initialization
    void Start () {

    }

    // Update is called once per frame
    void Update () {

        //Basic Movement

        if (Input.GetKey(KeyCode.W))
        {
        // Make stuff work here.
            transform.Translate(0f, speed * Time.deltaTime,0f); //x,y,z
        }

        if (Input.GetKey(KeyCode.S))
        {
            // Make stuff work here.
            transform.Translate(0f, -speed * Time.deltaTime,0f); //x,y,z

        }

        if (Input.GetKey(KeyCode.A))
        {
            // Make stuff work here.
            transform.Translate(-speed * Time.deltaTime, 0f,0f); //x,y,z

        }

        if (Input.GetKey(KeyCode.D))
        {
            // Make stuff work here.
            transform.Translate(speed * Time.deltaTime, 0f,0f); //x,y,z

        }

        //8 Directional Movement Fix

        if ((Input.GetKey(KeyCode.W) && Input.GetKey(KeyCode.D)) ||
            (Input.GetKey(KeyCode.W) && Input.GetKey(KeyCode.A)) ||
            (Input.GetKey(KeyCode.S) && Input.GetKey(KeyCode.A)) ||
            (Input.GetKey(KeyCode.S) && Input.GetKey(KeyCode.D)))
        {
            speed = 2.5f;
        }
        else
        {
            speed = 5f;
        }

    }
}