The high CPU usage by anti-malware service is run by Windows Defender for its function. Windows defender keeps on checking for infected files in the background. This causes high CPU usage which you may have noticed.
If you are using Nvidia Graphics card in your PC, you would be aware of NVIDIA Control Panel. It lets you modify your game settings or change their resolution. How to Fix NVIDIA Control Panel Not Opening Sometimes, there is an issue with the Nvidia drivers that does not let you open Nvidia control panel. We