I am running the demo version and evaluating the control for use in a MonoTouch app. Here is the sample code and time in ms from ViewDidLoad to ViewDidAppear, with and without a data source.

	public override void ViewDidLoad()
		{
			base.ViewDidLoad();

			CumulativeStopWatch.Reset();
			CumulativeStopWatch.Start();
	
			this.View.BackgroundColor = UIColor.White;
			this.EdgesForExtendedLayout = UIRectEdge.None;
			
			IGCalendarView calenderView = new IGCalendarView();
			calenderView.AutoresizingMask = UIViewAutoresizing.All;
			calenderView.Frame = View.Frame;
			calenderView.MinYear = 2000;
			calenderView.MaxYear = DateTime.UtcNow.AddYears(1).Year;
			calenderView.Theme = new IGCalendarTheme2();
			
			calenderView.AppointmentDataSources = new NSObject[] { new APDLDataSource() };
			this.View.Add(calenderView);
		}

		public override void ViewDidAppear(bool animated)
		{
			base.ViewDidAppear(animated);

			CumulativeStopWatch.Stop();		
		}

// without calenderView.AppointmentDataSources set

2014-01-21 22:38:32.713 apdl[318:60b] 01/22/2014 04:38:32 InfragisticsTestMonthView ms: 3609

// with calenderView.AppointmentDataSources

2014-01-21 22:39:50.555 apdl[329:60b] 01/22/2014 04:39:50 InfragisticsTestMonthView ms: 3669

Once the control is loaded the it is fast. Any insight on how to improve the viewController performance. The time really needs to be under 88ms