Hi I am having an issue every time I play rfactor sometimes after installing mod and try and play rfactor on steam the game lags during a race and becomes unplayable with the AI cars starting to jump. It happens with the F1 2017 mod and the Group C Mod. I try and change to one of the pre installed content cars and the same thing happens again. I scan the game files on steam and it finds the effected file and it replaces it. I restart the computer, start the game again and the same thing happens. Think it is game related not my PC as I have an Nvidia GTX 1,500 series and an I7 processor on my laptop. Can anyone help please it's really annoying? Thanks.