Is this possible? If possible, how could I do it? Apparently marking out the route with checkpoints only is not clear enough and I need to use props, but now I run into problems of props taking up too much CPU time. In this case the frame rate gets cut to a quarter of it can originally reach, let alone another scenario with a track 3 times as long...
Import the 3D model of the prop, and export is as an usable static object instead. Main thing you'd need to do is make sure it has a good Collision Mesh, and then transfer the textures of the object into your level/scenario folder, and adjust the materials.cs file accordingly. I'd suggesting making so that the object material(s) and texture get an unique name, so they don't conflict with the prop version.