DrawingControl3D slow Selection

[PaulMora93]

Hi xBIM team,

I'm working with DrawingControl3D to visualize IFC models and I'm experiencing a performance issue when assigning multiple elements to the Selection property.

My code selects around 292 visible elements (IIfcProduct) and assigns them as follows:

var selection = new EntitySelection(false);
selection.AddRange(selectedItems); // ~292 items
DrawingControl.Selection = selection;

The line DrawingControl.Selection = selection; is the main performance bottleneck.
Even after using optimizations like BeginInit(), HighSpeed = true, and EndInit(), it still takes a noticeable amount of time — which seems excessive for only ~300 items.

I’ve ensured that hidden elements are filtered out, and I also tried applying ModelOpacity = 0.1 and Zoom(), but the delay clearly happens during the Selection assignment.

Is there any recommended way to optimize multi-element selection?
Could it be that the control is triggering a redraw or event per entity added to the selection?

Thanks in advance.

Best regards,
Paul