: Always use Fullscreen . Never use Windowed or Windowed Fullscreen, as they introduce input lag and lower average FPS.
The most critical change is switching your to Performance - Lower Graphical Fidelity . This can triple your FPS on older hardware by using mobile-style assets that are much lighter on the GPU. Fortnite FPS Boost ULTRA LOW END PC & LAPTOPS! ...
: This security feature can cost up to 28% of your FPS on low-end systems. Go to Settings > Privacy & Security > Windows Security > Device Security > Core Isolation and toggle "Memory Integrity" OFF . : Always use Fullscreen