Hello davesnow, It depends if you want telegraph poles running the whole length of your layout, another suggestion would be to just have them in the open countryside then they won't lag the fps too much, and at least with a few poles visible it retains a little bit of realism, but if you have them in built-up areas and alongside roads, fences, walls, footpaths, tree splines, etc, then your fps will suffer greatly. Don't have too many cameras set up on your route either, as they affect your fps also.
Cheerz. ex-railwayman.