Haider_6 :
The epic games launcher takes up more than 99% and this other process which has no name can take up to 50%.
Can you send a screenshot of your task manager?
The Epic Games Launcher might be updating? What is the name of the process that is taking 50% of the CPU? It might be a malware hogging up your resources. Try ending it (Right click -> End Process Tree), and be sure that Epic Games Launcher is not updating, then test your games again.