When data is pre-generated results are only calculated per single filter alternative. This means that no combined filter selections will be pre-generated. So if multiple filter boxes or multiple selection in a single list have been enabled the results will not be based on pre-generated data as soon as the user combines two or more filters – instead it will be calculated on the fly.

If any specific combined filter alternatives needs to be pre-generated for best performance those options can be created in a Computed variable which then can be used as a Filter variable.