Train, Rail and Roller Coaster System

I bought the plugin and tried using it for my project. The project is a railway line spanning over 1000km but scaled down to about 10km. I realized after laying out the spine, my project begins to drop frame rate and also slows down and freezes. Any help to how to optimise my train track with such long distance. I would be very happy for any feedback as my deadline is really near. Thank you

Is this still receiving any updates whatsoever? You never replied to the recent questions on the Marketplace, and now that Fab doesn’t have a questions tab I need to go here.
& are there really no other ways to contact you?