: Turn off Memory Integrity (Settings → Device Security → Core Isolation). This security feature can cost you up to 33% of your FPS.
: Manually disable hidden features like grass by finding bShowGrass=False in your config files. New Fortnite 1000 FPS Trick
: In the Epic Games Launcher, add -USEALLAVAILABLECORES to force Fortnite to utilize your entire processor. : Turn off Memory Integrity (Settings → Device