Do not set it to "Realtime." This can freeze your mouse and keyboard because Windows gives the game such absolute power that it ignores input devices.

To reduce FPS drops and stuttering on lower-end PCs, players often use a "High Priority Zip" containing registry ( .reg ) files.

Navigate to Documents\Euro Truck Simulator 2\mod\ . You will likely see a mix of .scs , .zip , and loose folders.