I too work with rather complex vector diagrams of 2D floorplans that include air condition ducting.
I would like to be able to clean up the floorplans of unneccessary details, such as comments or furniture.
To do this it is advantageous to have the item imported in as seperate vector objects as opposed to an image map. I used to clean them up in adobe illustrator (ie select items by colour, stroke width, text, etc.) and was hoping to do the same in Affinity Designer.... however the import option has taken 10-15min and still hasn't opened the single page floorplan and doesn't look to be trying very hard too (ie. 20% CPU utilisation).
Any update coming for PDF import speed?