Make sure these meet or exceed the requirements list above. How to verify your PC or Mac meets system requirements PC:
Reducing the graphics settings in Fortnite and disabling background apps will help. If you just meet the minimum system requirements, Fortnite will run on your machine, but probably not on the highest settings. Note: Fortnite no longer supports Nvidia cards on Mac. Memory: 16 GB RAM or higher Hard Drive: NVMe Solid State Drive