Setting "stretched resolutions" (like 1024x768) directly in the config file to lower the GPU load.
Forcing "Alpha Performance" mode to prioritize frames over visuals. Fortnite Chapter 3 Config Pack
These are files or folders often shared by the competitive community to help low-end PCs run the game smoothly. They typically focus on: and high-resolution textures.
Lowering latency by disabling mouse acceleration and enabling "Nvidia Reflex Low Latency". 2. How to Manually Access Your Config File Fortnite Chapter 3 Config Pack
Turning off grass ( BShowGrass=false ), motion blur, and high-resolution textures.