Find a reputable settings.xml file designed for low-end PCs from sites like GTA 5 Mods or community guides on Steam Community.
To fix lag in Grand Theft Auto V (GTA V) for low-end graphics cards, you can download specialized configuration files (often found as settings.xml in .rar archives) that lower graphics beyond the standard in-game options. Use a Low-End Configuration File : Find a reputable settings
: Locate your game's setting folder (usually in Documents\Rockstar Games\GTA V ), back up your original settings.xml , and replace it with the downloaded one. Adjust Crucial In-Game Graphics : back up your original settings.xml