Your settings.xml file is located in your Windows AppData directory ( %appdata%\CitizenFX\gta5_settings.xml ). Open it with a text editor and force the following values: (Turns off shadows completely)

Beyond game files, optimizing Windows is essential for ultra-low-end performance:

Set to Half if you have a 60Hz monitor, locking FPS to 30 to provide smoother, more stable frame times. Shadows/Reflections: Turn off entirely. Particles & Post FX: Set to Low. 5. Summary of Benefits

: Turn this ON to prioritize CPU and GPU resources for your game.

Custom "Citizen" folders are pre-configured packages containing compressed textures. Navigate to your directory. Locate the citizen folder.