알고리즘의 시간복잡도에 따른 성능 변화

public virtual void Load(SaveData data)
    {
        int count = data;
        List<int> list = new();
        for (int i = 0; i < count; i++)
        {
            int indexId = data;
            ushort objId = data;
            T item;
            item = Items.Find(x => x.IndexId == indexId);
            if (item != null)
            {
                item.Load(data);
            }
            else
            {
                item = Create(ConvertId(objId), false);
                item.IndexId = indexId;
                item.ObjId = ConvertId(objId);
                item.Load(data);
            }
            list.Add(indexId);
        }
        var d = new List<T>();
        foreach (var i in Items)
        {
            if (!list.Contains(i.IndexId))
            {
                d.Add(i);
            }
        }
        foreach (var i in d)
        {
            i.Delete();
        }
    }

public virtual void Load(SaveData data)

    {

        int count = data;

        List<T> list = GetList();

        int arrayIndex = 0;

        for (int i = 0; i < count; i++)

        {

            int indexId = data;

            ushort objId = data;

            bool isLoad = false;

            while (arrayIndex < Items.Count)

            {

                var it = Items[arrayIndex];

                var itIndex = it.IndexId;

                if (itIndex < indexId)

                {

                    arrayIndex += 1;

                    continue;

                }

                if (itIndex == indexId)

                {

                    arrayIndex += 1;

                    it.Load(data);

                    isLoad = true;

                    list.Remove(it);

                    break;

                }

                if (itIndex > indexId)

                {

                    break;

                }

            }

            if (isLoad)

            {

                continue;

            }

            var item = Create(ConvertId(objId), false);

            item.IndexId = indexId;

            item.ObjId = ConvertId(objId);

            item.Load(data);

        }

        foreach (var i in list)

        {

            i.Delete();

        }

    }