gistfile1.cs

private void Start()
{
    _mousePositions = new Vector2[TimeFliesLikeAnArrow.Length];
    for (var i = 0; i < _mousePositions.Length; i++)
    {
        var ii = i;
        _subscriptions.Add(
            // Magic happens here:
            RxHost.Instance.GUIEvents
                .Where(e => e.type == EventType.mouseMove)
                .UnityDelay(TimeSpan.FromMilliseconds(ii*100))
                .Subscribe(e => _mousePositions[ii] = e.mousePosition)
            );
    }

}