: Switch to DirectX 10 for better performance on older hardware.
Find a reputable settings.xml file designed for low-end PCs from sites like GTA 5 Mods or community guides on Steam Community.
: Completely disable MSAA and use FXAA or turn it off entirely to save significant GPU resources.
: Set these to Normal (the lowest available setting).
: In Windows "Graphics Settings," add the GTA V executable and set it to High Performance to ensure it uses your dedicated GPU rather than integrated graphics.