These lights are "fake" light sources (emissions), meaning they don't usually cast complex shadows, so they shouldn't lag your game.
If you have updated your game to version 1.50 or higher, this specific version (V8.4) may cause crashes or texture glitches; you would need to look for a "fixed" or "re-uploaded" version for 1.50+. INTERIOR LIGHTS & EMBLEMS V8.4 1.41 – 1.43
Adds glowing brand logos (Scania, Volvo, MAN, DAF, etc.) to the back wall of the cabin. These lights are "fake" light sources (emissions), meaning