Troubleshooting low frame rate (FPS) in Fortnite - Epic Games

Lowering the 3D Resolution to 75% or less significantly reduces the number of pixels the GPU must render while keeping the user interface crisp.

Disabling V-Sync reduces input lag. Capping the frame rate at your monitor’s refresh rate (e.g., 60Hz) prevents the system from overworking, which helps maintain consistent frame times and reduces stutters. II. Windows & System Tweaks