I know, how can you possibly complain about detailed AI models? Well, after doing a bit of testing and tweaking, it seems like the main reason for FPS drops in Train Sim World is due to nearby AI Trains. This is especially noticeable around major hubs, like London and Reading, though also quite noticeable when passing by a train on route. I currently drop from 60fps to around 30fps when approaching Reading/London, depending on how many trains are stationed there. And about 10-5pfs when passing buy a high speed train on route. It would be fantastic if we had the ability to adjust the level of detail on AI trains, I don't particularly need to see the interior of the trains, for instance. It's hardly noticeable when passing by at high speed anyway. The models and textures doesn't need to be anywhere near as detailed as the player controlled train either. Anyway, that's my suggestion, thanks for reading!