NJT Comet IV cab car

Does anyone know why the NJT comet IV cab car is so laggy my Fps is in the 20s when I drive it
https://www.railworksamerica.com/forum/
https://www.railworksamerica.com/forum/viewtopic.php?f=29&t=19786
Brickrail782 wrote:Check to see if the cab light is on, those have tendencies to kill you frame rate when they're on.