An oversized floor element has a negative influence on the calculation performance. Due to this, the floor element in the site view should only be dimensioned as large as necessary.
Furthermore, a building that is very far away from the origin (position 0/0/0) can also have a significant negative impact on the calculation time.
If the luminaire groups of a light scene are combined with the same dimming values, this can have a positive effect on the calculation time.