Keep this at 100% if possible, but lowering it to 75% can provide a massive FPS boost on very weak systems.
Turn both Off to eliminate lag and visual stutter. Epic Games Launcher Tweaks How To Get MORE FPS on Low End PC in Fortnite S...
Go to your Library, click the three dots on Fortnite > Options, and uncheck High Resolution Textures . This saves over 14GB of space and reduces load times. Keep this at 100% if possible, but lowering