Moving from "Ultra" to "High" or "Normal" can reclaim roughly 10-20 FPS , particularly when driving through Blaine County.
Using DirectX 11 generally offers better stability and performance compared to older versions for modern hardware. System-Level Optimizations GTA 5 Best FPS Boost Guide 2023
Setting reflections to "High" instead of "Ultra" and disabling Reflection MSAA entirely can save up to 20 FPS . Moving from "Ultra" to "High" or "Normal" can
Use Soft Shadows set to "Sharp" or "Soft" rather than "Softer" or "Softest" to gain up to 10 FPS . In the Advanced Graphics menu, ensure High Resolution Shadows and Extended Shadows Distance are turned Off . Use Soft Shadows set to "Sharp" or "Soft"
Installing the game on an SSD is highly recommended to improve asset streaming and reduce micro-stutters while driving fast.
Found in Advanced Graphics, setting this to 0.500 or 0.667 lowers the internal render resolution while keeping the UI sharp, providing a major performance boost for weak GPUs.