If you are having problems with Epic Game Launcher or a game, it could be due to applications running in the background. Try reducing the number of programs at startup, also called a clean boot. This will free up computer memory and help the computer run smoother.
To perform a clean boot, please use this Microsoft article: How to perform a clean boot in Windows.
To boot your Mac in Safe Mode, please use this Apple article: How to use safe mode on your Mac.