I have a map (exported from some GIS-program) to a PDF with several thousands sublayers. The problem is that the simplified map layers on top of the layers hierarchy are probably just a smaller proportion of the total number of layers. So I am trying to simplify the document in order to delete the various layers that are not visible. The problem is that the document is really slow (Using a fairly proper basic HP Z workstation with a Quadro card) so I'd like to get some clues how to fast select and delete perhaps 100-500 sublayers at once?