I’m not convinced that the lag problem is entirely this mod’s fault. I have never heard anyone else report this problem. All this mod does is to tell TF that all vehicles should be available. There is no Lua code from this mod running when you play. My guess is that all vehicles are loaded, but there are others with a lot of vehicles mod’s running, without any complaints at all.
Are you sure you run TF on the GeForece card an not on a built in Intel chip or similar. There is really nothing I can do to improve performance since there is no mod code running.