UnityUI Fast infinity scroll

//
// Coded by afrokick 2016
//
#pragma warning disable 0649
using System;
using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class FriendsPopup : MonoBehaviour
{
    private int ItemHeight = 100;
    private const int Spacing = 8;
    private const int Top = 16;
    private const int Bottom = 50;

    [SerializeField]
    private FriendItemView[] _views;

    [SerializeField]
    private RectTransform _content;

    public event Action<int, FriendItemView> ItemShowed = delegate { };

    private int Count { get; set; }

    private float _y;
    private int _oldInd = -1;
    private RectTransform _item;

    void Update ()
    {
        _y = _content.anchoredPosition.y - Spacing;

        if (_y < 0)
            return;

        var inx = Mathf.FloorToInt (_y / (ItemHeight + Spacing));

        if (_oldInd == inx)
            return;

        //added to end
        if (inx > _oldInd) {
            var newInd = inx % _views.Length;

            newInd--;

            if (newInd < 0)
                newInd = _views.Length - 1;

            var id = inx + _views.Length - 1;

            if (id < Count) {
                _item = _views [newInd].GetComponent<RectTransform> ();

                var pos = _item.anchoredPosition;

                pos.y = -(Top + id * Spacing + id * ItemHeight);

                _item.anchoredPosition = pos;

                ItemShowed (id, _views [newInd]);
            }
        }
        //added to begin
        else {
            var newInd = inx % _views.Length;

            _item = _views [newInd].GetComponent<RectTransform> ();

            var pos = _item.anchoredPosition;

            pos.y = -(Top + inx * Spacing + inx * ItemHeight);

            _item.anchoredPosition = pos;

            ItemShowed (inx, _views [newInd]);
        }

        _oldInd = inx;
    }

    public void SetData (int count)
    {
        _oldInd = 0;

        Count = count;

        var h = ItemHeight * count * 1f + Top + Bottom + (count == 0 ? 0 : ((count - 1) * Spacing));

        _content.sizeDelta = new Vector2 (_content.sizeDelta.x, h);

        var pos = _content.anchoredPosition;
        pos.y = 0;
        _content.anchoredPosition = pos;

        bool showed = false;

        var y = Top;

        for (int i = 0; i < _views.Length; i++) {
            showed = i < count;

            _views [i].gameObject.SetActive (showed);

            if (showed) {
                pos = _views [i].GetComponent<RectTransform> ().anchoredPosition;
                pos.y = -y;
                _views [i].GetComponent<RectTransform> ().anchoredPosition = pos;

                y += Spacing + ItemHeight;

                ItemShowed (i, _views [i]);
            }
        }
    }
}

public class FriendItemView : MonoBehaviour
{
    [SerializeField]
    private Text _nameText;

    public void SetData (string friendName)
    {
        _nameText.text = friendName;
    }
}

public class Controller : MonoBehaviour
{
    [SerializeField]
    private FriendsPopup _popup;

    // Use this for initialization
    void Start ()
    {
        _popup.ItemShowed += (index, view) => {
            view.SetData ("item " + index);
        };

        _popup.SetData (1000);
    }
}