Setting reflections to "High" instead of "Ultra" and disabling Reflection MSAA entirely can save up to 20 FPS .
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. GTA 5 Best FPS Boost Guide 2023
Moving from "Ultra" to "High" or "Normal" can reclaim roughly 10-20 FPS , particularly when driving through Blaine County. Setting reflections to "High" instead of "Ultra" and