hi @Beaveee , Welcome
The AI answer says
Fortnite lag spikes when materials are limited are likely due to your system struggling to render the game with the increased visual complexity of the building mechanics, especially when the game is processing the destruction and placement of limited materials. To address this, try lowering your graphics settings, enabling Performance Mode (if available), ensuring your drivers are up-to-date, and closing unnecessary background applications
- Material Limitation and Rendering:
When you have limited materials in Fortnite, the game engine has to render a lot more building components and destruction events, which can be more resource-intensive than the standard gameplay.
- Performance Mode:
Fortnite’s Performance Mode (if available on your platform) prioritizes performance over visual fidelity, which can significantly improve FPS and reduce lag.
see video