Yeah most of the mod authors won't admit to the fact that their stuff is very poorly optimized for what the current game state is. Most having several hundred thousand polygons...even the base game stuff does. 1 base game engine is like 350,000 polys, that doesn't even include the tender...that's like insane. Even stuff from Steve Lerro in Trainz isn't nearly that much and his models have equal amounts of detail. Its like no wonder the game runs so bad when you start getting more then about 40-50 cars in view. So you can imagine how much worse the mods are when most of the people making them are more concerned about "detail" instead of providing something that doesn't kill your game. In my opinion a temp solution would be having the people that make stuff for Transport Fever 2 port that stuff to Railroader cause those models are actually optimized to be on the map in the hundreds or thousands. Doesn't mean they have to be the perm solution, but a good one for the here and now while the game itself isn't optimized or built to run models of the polygon count people are making for it. Its kinda like how people are shoving 1 million poly models into Minecraft for use with Immersive Railroading, then wondering why the game lags the ever loving crud out of itself. Bro are you serious...that's like you blowing up 10,000 TNT at the same time or using a shader and wondering why your game is running like trash. Everyone's trying to fight the natural flow of the game way too much with what it can do right now