If your game starts smooth but slows down after 20 minutes, you are likely running out of Video RAM. Small scripts are available that clear the cache while you play. Hardware Tips for Laptops
Switch to DirectX 10 or 10.1. It lacks some fancy lighting effects but runs much faster on old GPUs. gta 5 fps boost low end pc
Set to Off to remove the frame rate cap, or Half to lock it at 30 FPS for a more stable experience on very weak systems. If your game starts smooth but slows down
Use a cooling pad or simply prop up the back of the laptop to let air flow. It lacks some fancy lighting effects but runs
Shadows are the biggest performance killer in GTA 5. Removing them entirely via a mod can provide a massive 10-15 FPS jump instantly. 3. Clear VRAM Tool